{"id":1741,"date":"2026-07-21T01:33:45","date_gmt":"2026-07-20T17:33:45","guid":{"rendered":"https:\/\/jutrion.com\/?p=1741"},"modified":"2026-07-21T01:33:47","modified_gmt":"2026-07-20T17:33:47","slug":"guia-de-dispositivos-de-proteccion-contra-sobretensiones","status":"publish","type":"post","link":"https:\/\/jutrion.com\/es\/surge-protective-device-guide\/","title":{"rendered":"\u00bfQu\u00e9 es un dispositivo de protecci\u00f3n contra sobretensiones (SPD)? Una gu\u00eda completa sobre tipos, principios de funcionamiento y selecci\u00f3n"},"content":{"rendered":"<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-1\"><strong><strong>\u00bfQu\u00e9 es un dispositivo de protecci\u00f3n contra sobretensiones (DPS)?<\/strong><\/strong><\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Un dispositivo de protecci\u00f3n contra sobretensiones (DPS) es un dispositivo de protecci\u00f3n el\u00e9ctrica dise\u00f1ado para limitar las sobretensiones transitorias y derivar las corrientes de sobretensi\u00f3n. En condiciones normales de funcionamiento, el DPS permanece en un estado de alta impedancia y tiene poco o ning\u00fan efecto sobre el sistema el\u00e9ctrico. Cuando un rayo, una conmutaci\u00f3n de la red el\u00e9ctrica, el arranque y parada de motores u otros eventos transitorios provocan un aumento repentino de la tensi\u00f3n de l\u00ednea, el DPS conmuta r\u00e1pidamente a un estado conductor de baja impedancia. Esto proporciona una v\u00eda de descarga para la corriente de sobretensi\u00f3n, al tiempo que limita la tensi\u00f3n residual que llega a los equipos aguas abajo, reduciendo as\u00ed el riesgo de rotura del aislamiento, da\u00f1os en componentes electr\u00f3nicos, fallos de equipos y tiempos de inactividad no planificados.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">El dise\u00f1o, las pruebas de rendimiento y la aplicaci\u00f3n pr\u00e1ctica de los DPS deben cumplir con las normas pertinentes. <strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314?utm_source.com\" target=\"_blank\" rel=\"noopener\">IEC 61643-11<\/a><\/strong> especifica los requisitos de rendimiento y los m\u00e9todos de ensayo para los dispositivos de protecci\u00f3n contra sobretensiones conectados a sistemas de alimentaci\u00f3n de CA de baja tensi\u00f3n, mientras que <strong><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\/70?utm_source.com\" target=\"_blank\" rel=\"noopener\">el Art\u00edculo 242 de NFPA 70, el C\u00f3digo El\u00e9ctrico Nacional (NEC)<\/a>,<\/strong> aborda la aplicaci\u00f3n de la protecci\u00f3n contra sobretensiones en las instalaciones el\u00e9ctricas de los Estados Unidos. Estas normas proporcionan una orientaci\u00f3n importante para el ensayo, la selecci\u00f3n y la instalaci\u00f3n de los DPS, lo que contribuye a mejorar la seguridad y la fiabilidad de los sistemas modernos de distribuci\u00f3n de energ\u00eda de baja tensi\u00f3n.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-2\"><strong>\u00bfQu\u00e9 es una sobretensi\u00f3n el\u00e9ctrica?<\/strong><\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Una sobretensi\u00f3n el\u00e9ctrica es un pico de corta duraci\u00f3n de tensi\u00f3n o corriente que circula por un circuito de alimentaci\u00f3n, control o comunicaci\u00f3n. Normalmente aumenta muy r\u00e1pidamente y luego decae durante un per\u00edodo m\u00e1s largo.<br>Aunque el evento puede durar solo unos pocos microsegundos, la tensi\u00f3n resultante puede ser lo suficientemente alta como para da\u00f1ar el aislamiento, los componentes electr\u00f3nicos, los equipos de control y otras cargas sensibles.<br><strong>IEC 60050-161<\/strong> define una sobretensi\u00f3n como una onda transitoria que se propaga a lo largo de una l\u00ednea o circuito y se caracteriza por un aumento r\u00e1pido seguido de una ca\u00edda m\u00e1s lenta.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>\u00bfQu\u00e9 causa las sobretensiones el\u00e9ctricas?<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Las sobretensiones el\u00e9ctricas suelen estar asociadas a dos fuentes principales: los eventos relacionados con rayos y las operaciones de conmutaci\u00f3n dentro del sistema el\u00e9ctrico.<br>Los rayos pueden introducir sobretensiones transitorias mediante impactos directos, impactos cercanos o tensiones inducidas en los conductores conectados. Las sobretensiones de conmutaci\u00f3n pueden producirse cuando se energizan o desconectan motores, transformadores, bancos de condensadores, contactores, rel\u00e9s u otras cargas de alta potencia.<br><strong><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/4223?utm_source.com\" target=\"_blank\" rel=\"noopener\">IEC 61000-4-5<\/a> <\/strong>proporciona m\u00e9todos normalizados para ensayar la inmunidad de los equipos el\u00e9ctricos y electr\u00f3nicos frente a sobretensiones unidireccionales causadas por los efectos de los rayos y los transitorios de conmutaci\u00f3n del sistema el\u00e9ctrico.<\/p>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color has-medium-font-size wp-elements-3 wp-block-paragraph\"><strong>COMPARACI\u00d3N DE SOBRETENSIONES POR RAYOS Y SOBRETENSIONES DE CONMUTACI\u00d3N<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Parameter<\/strong><\/th><th><strong>Sobretensi\u00f3n por rayo<\/strong><\/th><th><strong>Sobretensi\u00f3n de conmutaci\u00f3n<\/strong><\/th><\/tr><\/thead><tbody><tr><td><strong>Formas de onda t\u00edpicas<\/strong><\/td><td>10\/350 \u03bcs para corriente directa de rayo; 8\/20 \u03bcs para corriente de sobretensi\u00f3n inducida; 10\/700 \u03bcs para l\u00edneas de comunicaci\u00f3n<\/td><td>Onda de tensi\u00f3n de 1,2\/50 \u03bcs y onda de corriente de 8\/20 \u03bcs<\/td><\/tr><tr><td><strong>Frecuencia de ocurrencia<\/strong><\/td><td>Relativamente poco frecuente y asociada principalmente a tormentas el\u00e9ctricas<\/td><td>M\u00e1s frecuente y puede ocurrir siempre que se encienda o apague un equipo el\u00e9ctrico<\/td><\/tr><tr><td><strong>Nivel de energ\u00eda<\/strong><\/td><td>Energ\u00eda muy alta, que puede alcanzar cientos de kilojulios y causar da\u00f1os inmediatos en los equipos<\/td><td>Energ\u00eda generalmente m\u00e1s baja, pero la exposici\u00f3n repetida puede degradar gradualmente los componentes<\/td><\/tr><tr><td><strong>Enfoque de protecci\u00f3n recomendado<\/strong><\/td><td>DPS Tipo 1 en la acometida principal, seguido de una protecci\u00f3n contra sobretensiones coordinada aguas abajo<\/td><td>DPS Tipo 2 o Tipo 3 instalado en los cuadros de distribuci\u00f3n o cerca de los equipos sensibles<\/td><\/tr><tr><td><strong>Rango t\u00edpico de sobretensi\u00f3n<\/strong><\/td><td>De varios kilovoltios a decenas de kilovoltios<\/td><td>De varios cientos de voltios a varios kilovoltios<\/td><\/tr><tr><td><strong>Fuentes comunes<\/strong><\/td><td>Impactos directos de rayo, impactos cercanos, elevaci\u00f3n del potencial de tierra y efectos de rayos inducidos<\/td><td>Motores, transformadores, bancos de capacitores, contactores, rel\u00e9s y otros dispositivos de conmutaci\u00f3n<\/td><\/tr><tr><td><strong>Impacto t\u00edpico<\/strong><\/td><td>Ruptura del aislamiento, arco el\u00e9ctrico, da\u00f1o en cables, incendio o falla inmediata del equipo<\/td><td>Degradaci\u00f3n de componentes electr\u00f3nicos, mal funcionamiento del sistema de control, errores de datos o reducci\u00f3n de la vida \u00fatil del equipo<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-4\">\u00bfC\u00f3mo funciona un dispositivo de protecci\u00f3n contra sobretensiones?<\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Un Dispositivo de Protecci\u00f3n contra Sobretensiones (DPS) funciona como una v\u00e1lvula de alivio de <strong>presi\u00f3n el\u00e9ctrica automatizada y ultrarr\u00e1pida<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">En condiciones normales de la red, el DPS act\u00faa como un interruptor abierto con una resistencia interna (impedancia) extremadamente alta, impidiendo que cualquier corriente fluya a trav\u00e9s de \u00e9l. Sin embargo, cuando un pico de sobretensi\u00f3n (causado por un rayo o por conmutaci\u00f3n en la red) ingresa al sistema, el DPS reacciona instant\u00e1neamente en <strong>nanosegundos<\/strong>, reduciendo su resistencia a casi cero. Esto crea una ruta paralela segura que desv\u00eda la masiva corriente de sobretensi\u00f3n lejos del equipo sensible y directamente hacia tierra.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"905\" height=\"302\" src=\"https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/how-surge-protective-device-works.png\" alt=\"How a surge protective device (SPD) works in three steps.\" class=\"wp-image-1742\" srcset=\"https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/how-surge-protective-device-works.png 905w, https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/how-surge-protective-device-works-300x100.png 300w, https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/how-surge-protective-device-works-768x256.png 768w\" sizes=\"auto, (max-width: 905px) 100vw, 905px\" \/><figcaption class=\"wp-element-caption\"><em>Diagrama que muestra c\u00f3mo funciona un dispositivo de protecci\u00f3n contra sobretensiones en tres etapas: operaci\u00f3n normal de alta impedancia, respuesta a la sobretensi\u00f3n y desviaci\u00f3n de corriente a tierra seguida de reinicio autom\u00e1tico.<\/em><\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">El proceso de funcionamiento en 3 pasos<\/h3>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Estado normal (alta impedancia): Cuando la tensi\u00f3n de l\u00ednea permanece dentro de los l\u00edmites operativos normales, los componentes internos mantienen una impedancia de varios megaohmios. El SPD permanece \u201cinvisible\u201d para el circuito y pr\u00e1cticamente no consume corriente de fuga.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Evento de sobretensi\u00f3n (baja impedancia instant\u00e1nea): En el momento en que una tensi\u00f3n transitoria supera el umbral de limitaci\u00f3n del SPD (Uc), los elementos internos no lineales conmutan de alta resistencia a baja resistencia en menos de 25 nanosegundos.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Derivaci\u00f3n de corriente y restablecimiento (disipaci\u00f3n de energ\u00eda): La energ\u00eda de la sobretensi\u00f3n se canaliza de forma segura a trav\u00e9s del conductor de puesta a tierra (PE). Una vez que el pico transitorio disminuye y la tensi\u00f3n de l\u00ednea vuelve a la normalidad, los componentes internos se recuperan autom\u00e1ticamente a su estado de alta impedancia, restableciendo el funcionamiento normal del circuito.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">Los componentes internos principales: MOV frente a GDT<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"739\" height=\"370\" src=\"https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/mov-vs-gdt-surge-protection-components.png\" alt=\"MOV vs. GDT components inside a surge protective device (SPD).\" class=\"wp-image-1743\" style=\"width:750px;height:auto\" srcset=\"https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/mov-vs-gdt-surge-protection-components.png 739w, https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/mov-vs-gdt-surge-protection-components-300x150.png 300w\" sizes=\"auto, (max-width: 739px) 100vw, 739px\" \/><figcaption class=\"wp-element-caption\">Comparaci\u00f3n entre MOV y GDT, los dos componentes de protecci\u00f3n contra sobretensiones m\u00e1s comunes utilizados en los SPD.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">El mecanismo de funcionamiento se basa en componentes el\u00e9ctricos no lineales de alto rendimiento integrados dentro del m\u00f3dulo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Varistores de \u00f3xido met\u00e1lico (MOV): El componente m\u00e1s utilizado en los SPD de Tipo 2 de CA y CC. Los MOV presentan una ca\u00edda brusca de la resistencia el\u00e9ctrica a medida que aumenta la tensi\u00f3n, ofreciendo capacidades excepcionales de absorci\u00f3n de energ\u00eda y tiempos de respuesta inferiores a un nanosegundo.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tubos de descarga de gas (GDT): Se emplean habitualmente en arquitecturas de explosor de Tipo 1 o en la protecci\u00f3n de l\u00edneas de comunicaci\u00f3n. Los GDT provocan un arco el\u00e9ctrico e ionizan el gas cuando se activan, capaces de descargar corrientes de rayo elevadas sin destrucci\u00f3n t\u00e9rmica.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-5\"><strong>\u00bfCu\u00e1les son los principales tipos de dispositivos de protecci\u00f3n contra sobretensiones?<\/strong><\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Un evento repentino de rayo o la conmutaci\u00f3n y el arranque de equipos de alta potencia en una instalaci\u00f3n industrial pueden generar una sobretensi\u00f3n transitoria de gran magnitud en un per\u00edodo muy corto. Dichas sobretensiones pueden da\u00f1ar controladores costosos, servidores, variadores de frecuencia y otros equipos electr\u00f3nicos sensibles. En casos graves, pueden incluso provocar la parada de toda una l\u00ednea de producci\u00f3n. Sin embargo, no todos los dispositivos de protecci\u00f3n contra sobretensiones est\u00e1n dise\u00f1ados para soportar corrientes de rayo de alta energ\u00eda, y no todos los tipos de SPD son adecuados para instalarse en el mismo punto del sistema de distribuci\u00f3n el\u00e9ctrica.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Un dispositivo de protecci\u00f3n contra sobretensiones puede entenderse como el \u201cairbag\u201d del sistema el\u00e9ctrico, pero cada tipo de SPD tiene una funci\u00f3n de protecci\u00f3n claramente definida. Desde la primera l\u00ednea de defensa en la entrada de servicio del edificio, donde se derivan las corrientes de sobretensi\u00f3n de alta energ\u00eda, hasta la protecci\u00f3n intermedia en los cuadros de distribuci\u00f3n y la protecci\u00f3n fina cerca de los equipos sensibles, <em><strong>los SPD de Tipo 1, Tipo 2 y Tipo 3<\/strong> <\/em>operan en diferentes niveles del sistema de protecci\u00f3n. Adem\u00e1s, <strong><em>los SPD combinados de Tipo 1+2<\/em><\/strong> integran la capacidad de descarga de corriente de rayo de un dispositivo de Tipo 1 con el rendimiento de limitaci\u00f3n de tensi\u00f3n de un dispositivo de Tipo 2 en una sola unidad, lo que los convierte en una soluci\u00f3n pr\u00e1ctica para entradas de servicio y cuadros de distribuci\u00f3n principales. Una protecci\u00f3n eficaz contra sobretensiones depende de la selecci\u00f3n y coordinaci\u00f3n de estos dispositivos seg\u00fan el riesgo del sistema, la ubicaci\u00f3n de la instalaci\u00f3n y la capacidad de soportar impulsos del equipo protegido.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">Dispositivo de protecci\u00f3n contra sobretensiones de Tipo 1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Los SPD de Tipo 1 son dispositivos de protecci\u00f3n primaria contra sobretensiones instalados en el lado de l\u00ednea de la entrada de servicio principal (entre el secundario del transformador de la compa\u00f1\u00eda el\u00e9ctrica y el interruptor principal de servicio).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Funci\u00f3n principal: Dise\u00f1ados para soportar transitorios de alta energ\u00eda causados por impactos directos o cercanos de rayos y por conmutaciones de la red el\u00e9ctrica antes de que la sobretensi\u00f3n llegue al cuadro de distribuci\u00f3n principal.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Norma de prueba y forma de onda: Evaluado seg\u00fan las normas IEC 61643 utilizando la forma de onda de corriente de impulso de 10\/350 \u03bcs (Iimp), que simula descargas de energ\u00eda de pico alto.<\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h3 class=\"wp-block-heading has-medium-font-size\">Dispositivo de protecci\u00f3n contra sobretensiones Tipo 2<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Los DPS Tipo 2 sirven como protecci\u00f3n secundaria y se instalan en el lado de carga del interruptor principal de servicio, normalmente ubicados dentro de tableros de subdistribuci\u00f3n o paneles de control de derivaciones.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Funci\u00f3n principal: Limita las tensiones de impulso residuales que pasan a trav\u00e9s de los DPS Tipo 1 y mitiga las sobretensiones generadas internamente por cargas de conmutaci\u00f3n inductivas (p. ej., unidades HVAC, motores y variadores de frecuencia).<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Norma de prueba y forma de onda: Probado utilizando la forma de onda de corriente de 8\/20 \u03bcs, caracterizada por la corriente nominal de descarga (In) y la corriente m\u00e1xima de descarga (Imax).<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h3 class=\"wp-block-heading has-medium-font-size\">Dispositivo de protecci\u00f3n contra sobretensiones Tipo 3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Los DPS Tipo 3 proporcionan protecci\u00f3n localizada en el punto de uso para equipos terminales altamente sensibles.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Funci\u00f3n principal: Filtra las sobretensiones transitorias residuales de bajo nivel directamente en el terminal de carga para evitar la ruptura del aislamiento o la corrupci\u00f3n de datos en microelectr\u00f3nica.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Requisito de instalaci\u00f3n: Debe instalarse aguas abajo con una distancia m\u00ednima de conductor (normalmente al menos 10 metros \/ 30 pies) desde el DPS Tipo 2 aguas arriba para garantizar un desacoplamiento y una coordinaci\u00f3n de energ\u00eda adecuados.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\">Dispositivo de protecci\u00f3n contra sobretensiones Tipo 1+2 (Tipo combinado)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Los DPS Tipo 1+2 (tambi\u00e9n clasificados como Clase I+II) combinan la capacidad de descarga de corriente de impulso de alta energ\u00eda de un dispositivo Tipo 1 con el bajo nivel de protecci\u00f3n de tensi\u00f3n (Up) de un dispositivo Tipo 2 en una sola unidad compacta.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Funci\u00f3n principal: Desv\u00eda directamente corrientes de rayo directo de alta energ\u00eda mientras limita simult\u00e1neamente transitorios de conmutaci\u00f3n de bajo nivel, proporcionando protecci\u00f3n continua sin requerir una distancia m\u00ednima de desacoplamiento entre unidades separadas Tipo 1 y Tipo 2.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Norma de prueba y forma de onda: Probado doblemente seg\u00fan las normas IEC 61643 tanto para corrientes de impulso de 10\/350 \u03bcs (Iimp) como para corrientes de descarga nominales\/m\u00e1ximas de 8\/20 \u03bcs (In \/ Imax).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-6 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Nota de ingenier\u00eda<\/strong>\uff1a<br>La protecci\u00f3n eficaz contra sobretensiones depende de una protecci\u00f3n coordinada en diferentes niveles. Los DPS Tipo 1 o Tipo 1+2 manejan sobretensiones de alta energ\u00eda en la entrada del sistema, los DPS Tipo 2 protegen los circuitos de distribuci\u00f3n y los DPS Tipo 3 proporcionan una protecci\u00f3n fina para equipos sensibles.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--70)\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-7\"><strong><strong>DPS Tipo 1, Tipo 2, Tipo 3 y Tipo 1+2: Diferencias clave<\/strong><\/strong><\/h2>\n<\/blockquote>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Caracter\u00edstica<\/strong><\/th><th><strong>DPS Tipo 1<\/strong><\/th><th><strong>DPS Tipo 1+2<\/strong><\/th><th><strong>DPS Tipo 2<\/strong><\/th><th><strong>DPS Tipo 3<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Funci\u00f3n principal<\/td><td>Desv\u00eda la corriente de rayo directo<\/td><td>Combina la descarga de corriente de rayo y la protecci\u00f3n contra sobretensiones<\/td><td>Protege contra rayos inducidos y sobretensiones de conmutaci\u00f3n<\/td><td>Protecci\u00f3n final para equipos sensibles<\/td><\/tr><tr><td>Ubicaci\u00f3n de instalaci\u00f3n<\/td><td>Entrada de servicio<\/td><td>Entrada de servicio o tablero de distribuci\u00f3n principal<\/td><td>Tablero de distribuci\u00f3n principal o secundario<\/td><td>Cerca del equipo protegido<\/td><\/tr><tr><td>Forma de onda de prueba<\/td><td>10\/350 \u03bcs<\/td><td>10\/350 \u03bcs y 8\/20 \u03bcs<\/td><td>8\/20 \u03bcs<\/td><td>Onda combinada<\/td><\/tr><tr><td>Par\u00e1metros principales<\/td><td>Iimp, Up<\/td><td>Iimp, In, Imax, Up<\/td><td>In, Imax, Up<\/td><td>Uoc, Up<\/td><\/tr><tr><td>Etapa de protecci\u00f3n<\/td><td>Protecci\u00f3n primaria<\/td><td>Protecci\u00f3n primaria y secundaria<\/td><td>Protecci\u00f3n secundaria<\/td><td>Protecci\u00f3n final<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color has-small-font-size wp-elements-8 wp-block-paragraph\">La tabla anterior ofrece una comparaci\u00f3n r\u00e1pida de los cuatro tipos principales de SPD. En la pr\u00e1ctica, la selecci\u00f3n del dispositivo de protecci\u00f3n contra sobretensiones adecuado depende de la ubicaci\u00f3n de la instalaci\u00f3n, el riesgo de exposici\u00f3n a rayos, la configuraci\u00f3n del sistema y el nivel de protecci\u00f3n requerido. En muchas instalaciones, se coordinan m\u00faltiples tipos de SPD para lograr una protecci\u00f3n eficaz contra sobretensiones en todo el sistema el\u00e9ctrico.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--70)\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-9\">C\u00f3mo seleccionar el dispositivo de protecci\u00f3n contra sobretensiones (SPD) adecuado<\/h2>\n<\/blockquote>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-10 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Elegir el dispositivo de protecci\u00f3n contra sobretensiones (SPD) adecuado implica algo m\u00e1s que seleccionar la corriente de descarga nominal m\u00e1s alta. La tensi\u00f3n del sistema, la ubicaci\u00f3n de la instalaci\u00f3n, la exposici\u00f3n a rayos, la disposici\u00f3n de la puesta a tierra y la coordinaci\u00f3n entre las etapas de protecci\u00f3n desempe\u00f1an un papel fundamental en el rendimiento general de la protecci\u00f3n contra sobretensiones. El siguiente ejemplo ilustra por qu\u00e9 la selecci\u00f3n adecuada del SPD es esencial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">A finales de 2023, una tormenta el\u00e9ctrica severa azot\u00f3 una planta de fabricaci\u00f3n industrial en el centro de Texas. Un rayo directo impact\u00f3 la l\u00ednea de suministro el\u00e9ctrico a menos de 200 metros del patio de distribuci\u00f3n principal de la instalaci\u00f3n. La planta contaba con un supresor de sobretensiones b\u00e1sico instalado en el tablero principal de baja tensi\u00f3n, lo que llev\u00f3 a la gerencia a creer que sus operaciones estaban completamente protegidas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">En cuesti\u00f3n de milisegundos, la realidad de una protecci\u00f3n contra sobretensiones incompleta se hizo evidente:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">P\u00e9rdida financiera masiva: El impulso inicial de alta energ\u00eda sobrepas\u00f3 el \u00fanico protector del panel, enviando una severa sobretensi\u00f3n transitoria a trav\u00e9s de la red de distribuci\u00f3n interna.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Da\u00f1os catastr\u00f3ficos en los equipos: M\u00e1s de 15 variadores de frecuencia (VFD), docenas de controladores l\u00f3gicos programables (PLC), conjuntos de sensores sensibles y centros de mecanizado CNC computarizados sufrieron una ruptura inmediata del aislamiento y fallos en las placas de circuitos.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Costoso tiempo de inactividad no planificado: Toda la l\u00ednea de producci\u00f3n automatizada qued\u00f3 fuera de servicio durante 16 d\u00edas mientras se adquir\u00edan y reingenierizaban los componentes de reemplazo, lo que result\u00f3 en m\u00e1s de $1,2 millones en costos directos de reemplazo de hardware y p\u00e9rdida de productividad operativa.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Un an\u00e1lisis de ingenier\u00eda forense realizado tras el incidente revel\u00f3 la causa ra\u00edz: la falta de protecci\u00f3n contra sobretensiones en cascada y de m\u00faltiples etapas. La instalaci\u00f3n depend\u00eda de un \u00fanico dispositivo de protecci\u00f3n en la entrada principal, esperando que absorbiera corrientes de rayo de alta energ\u00eda y, al mismo tiempo, limitara los picos de tensi\u00f3n de bajo nivel para los microelectr\u00f3nicos sensibles aguas abajo, una tarea que ning\u00fan dispositivo individual est\u00e1 dise\u00f1ado para realizar por s\u00ed solo.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Las sobretensiones transitorias, ya sean generadas externamente por rayos directos o indirectos, o internamente por la conmutaci\u00f3n de cargas inductivas pesadas, siguen trayectorias f\u00edsicas predecibles. Proteger una infraestructura industrial, comercial o residencial requiere una arquitectura de protecci\u00f3n escalonada y por niveles definida por normas internacionales reconocidas como <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65315?utm_source.com\" target=\"_blank\" rel=\"noopener\">IEC 61643-01<\/a> y los <a href=\"https:\/\/www.ul.com\/services\/surge-protection-device-testing-and-certification-services?utm_sourcet.com\" target=\"_blank\" rel=\"noopener\">UL 1449.<\/a><\/p>\n\n\n\n<p class=\"has-palette-color-4-color has-text-color has-link-color wp-elements-11 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong><em>Para seleccionar el DPS adecuado, se deben considerar varios factores clave, incluidos el sistema de alimentaci\u00f3n, la tensi\u00f3n de funcionamiento, el tipo de DPS, el nivel de protecci\u00f3n y los requisitos de instalaci\u00f3n.<\/em><\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-palette-color-4-color has-text-color has-link-color has-large-font-size wp-elements-12 wp-block-paragraph\"><strong>Selecci\u00f3n del DPS de un vistazo<\/strong><\/p>\n<\/blockquote>\n\n\n\n<ul style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-list has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-13\">\n<li><strong>Paso 1: Confirmar el sistema de alimentaci\u00f3n y seleccionar Uc<\/strong><\/li>\n\n\n\n<li><strong>Paso 2: Seleccionar el tipo de DPS seg\u00fan la ubicaci\u00f3n de instalaci\u00f3n y la ZPR<\/strong><\/li>\n\n\n\n<li><strong>Paso 3: Determinar Iimp, In e Imax<\/strong><\/li>\n\n\n\n<li><strong>Paso 4: Verificar el nivel de protecci\u00f3n de tensi\u00f3n Up<\/strong><\/li>\n\n\n\n<li><strong>Paso 5: Confirmar el n\u00famero de polos, el dispositivo de desconexi\u00f3n, la se\u00f1alizaci\u00f3n remota y la protecci\u00f3n de respaldo<\/strong><\/li>\n\n\n\n<li><strong>Paso 6: Verificar la coordinaci\u00f3n de energ\u00eda entre m\u00faltiples DPS<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-4-color has-text-color has-link-color wp-elements-14 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Las siguientes secciones explican cada paso con m\u00e1s detalle y muestran c\u00f3mo estos factores afectan la selecci\u00f3n del DPS.<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Paso 1: Confirmar el sistema de alimentaci\u00f3n y seleccionar Uc<\/strong><\/h3>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Sistema de alimentaci\u00f3n<\/strong><\/th><th><strong>Selecci\u00f3n t\u00edpica de Uc<\/strong><\/th><th><strong>Nota de selecci\u00f3n<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Sistema TN-S, TN-C-S o TT de 230\/400 V<\/td><td>275 V CA para protecci\u00f3n L\u2013N<\/td><td>Selecci\u00f3n com\u00fan para sistemas de distribuci\u00f3n est\u00e1ndar de 230 V CA<\/td><\/tr><tr><td>Sistema IT de 400 V<\/td><td>Seleccionar seg\u00fan la tensi\u00f3n m\u00e1s alta posible entre l\u00ednea y tierra<\/td><td>La tensi\u00f3n a tierra puede aumentar durante la primera falla de aislamiento<\/td><\/tr><tr><td>Sistema de CC solar fotovoltaico<\/td><td>Ucpv debe ser mayor que la tensi\u00f3n m\u00e1xima de circuito abierto del arreglo fotovoltaico<\/td><td>Considere el aumento de Voc a baja temperatura y la tensi\u00f3n del sistema, como 600 V, 1000 V o 1500 V CC<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Paso 2: Seleccionar el tipo de DPS seg\u00fan la ubicaci\u00f3n de instalaci\u00f3n y la ZPR<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Los tipos de DPS deben seleccionarse seg\u00fan la ubicaci\u00f3n de instalaci\u00f3n, la zona de protecci\u00f3n contra rayos, el riesgo de corriente de rayo y la capacidad de soporte de impulsos del equipo aguas abajo. Las categor\u00edas comunes de DPS para sistemas de baja tensi\u00f3n incluyen DPS de Tipo 1, Tipo 2, Tipo 3 y DPS combinados Tipo 1+2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>DPS Tipo 1 \u2013 Protecci\u00f3n contra corriente de rayo<\/strong><\/p>\n\n\n\n<ul style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-list\">\n<li><strong>Installation Location:<\/strong> Building service entrance, main low-voltage switchboard, and the boundary between LPZ 0 and LPZ 1.<\/li>\n\n\n\n<li><strong>Main Function: <\/strong>Discharges high-energy lightning currents that may enter the electrical installation through the incoming power supply.<\/li>\n\n\n\n<li><strong>Key Parameters: <\/strong>Tested with a 10\/350 \u03bcs waveform. Common Iimp ratings include 12.5 kA, 25 kA, and higher values. The voltage protection level, Up, is commonly around 2.5 kV, depending on the product design.<\/li>\n\n\n\n<li><strong>Typical Applications: <\/strong>Industrial plants, outdoor facilities, large buildings, and installations with external lightning protection systems or a high risk of direct lightning currents.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-9-color has-text-color has-link-color wp-elements-15 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong><em>A Type 1 SPD is mainly intended to handle high lightning current energy. Additional downstream Type 2 or Type 3 protection may still be required to reduce the residual voltage reaching sensitive equipment.<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Type 2 SPD \u2013 Distribution-Level Surge Protection<\/strong><\/p>\n\n\n\n<ul style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-list\">\n<li><strong>Installation Location:<\/strong> Main distribution boards, sub-distribution boards, workshop power panels, and industrial control cabinets.<\/li>\n\n\n\n<li><strong>Main Function:<\/strong> Protects against induced lightning surges, switching transients, and residual surge energy passing through an upstream Type 1 SPD.<\/li>\n\n\n\n<li><strong>Key Parameters:<\/strong> Tested with an 8\/20 \u03bcs waveform. Common ratings include In of 20 kA and Imax of 40\u201380 kA. The voltage protection level, Up, is commonly between 1.5 and 1.8 kV.<\/li>\n\n\n\n<li><strong>Typical Applications:<\/strong> Residential buildings, commercial facilities, and general industrial power distribution systems.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-9-color has-text-color has-link-color wp-elements-16 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong><em>Type 2 SPDs protect electrical systems against induced lightning surges, switching transients, and residual surge energy passing through an upstream Type 1 SPD.<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Type 3 SPD \u2013 Final Protection for Sensitive Equipment<\/strong><\/p>\n\n\n\n<ul style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-list\">\n<li><strong>Installation Location:<\/strong> Close to PLCs, variable frequency drives, servers, instruments, socket outlets, and other sensitive terminal equipment.<\/li>\n\n\n\n<li><strong>Main Function:<\/strong> Further limits residual overvoltage and provides final-stage protection for sensitive electronic equipment.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Key Parameters:<\/strong> Tested with a combination wave. The main parameters are Uoc and Up, although some products may also specify a nominal discharge current.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Typical Applications:<\/strong> Automation systems, communication equipment, servers, measurement instruments, and other sensitive electronic loads.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-9-color has-text-color has-link-color wp-elements-17 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong><em>Type 3 SPDs have limited energy-handling capability and should normally be coordinated with an upstream Type 1, Type 2, or Type 1+2 SPD.<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Type 1+2 Combined SPD \u2013 Lightning Current and Surge Protection<\/strong><\/p>\n\n\n\n<ul style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-list\">\n<li><strong>Installation Location:<\/strong> Building service entrances, main switchboards, solar PV AC distribution panels, compact distribution boards, and retrofit installations.<\/li>\n\n\n\n<li><strong>Main Function:<\/strong> Combines lightning-current discharge capability and surge-voltage limitation in a single device.<\/li>\n\n\n\n<li><strong>Key Parameters:<\/strong> Iimp, In, Imax, and Up should all be considered. Common Iimp ratings include 12.5 kA and 25 kA per pole, while In is commonly 20 kA or higher. Final values should be confirmed according to the product specifications and project requirements.<\/li>\n\n\n\n<li><strong>Typical Applications:<\/strong> Industrial facilities, commercial buildings, solar PV systems, compact switchboards, and projects where installation space is limited.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-9-color has-text-color has-link-color wp-elements-18 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><em><strong>A Type 1+2 SPD meets both Type 1 and Type 2 protection requirements in a single device. It combines high-energy lightning-current discharge capability with voltage-limiting protection.<\/strong><\/em><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-text-align-center has-palette-color-4-color has-text-color has-link-color has-medium-font-size wp-elements-19 wp-block-paragraph\"><strong>SPD Selection Guide by Application<\/strong><\/p>\n<\/blockquote>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Application Condition<\/strong><\/th><th><strong>Recommended SPD Type<\/strong><\/th><th><strong>Typical Installation Location<\/strong><\/th><th><strong>Par\u00e1metros clave<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Building with an external lightning protection system<\/td><td>Type 1 or Type 1+2<\/td><td>Service entrance or main switchboard<\/td><td>Iimp, Up<\/td><\/tr><tr><td>General residential or commercial distribution system<\/td><td>Type 2<\/td><td>Tablero de distribuci\u00f3n principal o secundario<\/td><td>In, Imax, Up<\/td><\/tr><tr><td>Sensitive electronic equipment<\/td><td>Type 3<\/td><td>Cerca del equipo protegido<\/td><td>Uoc, Up<\/td><\/tr><tr><td>Industrial facility with high lightning exposure<\/td><td>Type 1+2 with downstream Type 2 protection<\/td><td>Main switchboard and sub-distribution boards<\/td><td>Iimp, In, Up<\/td><\/tr><tr><td>Solar PV DC system<\/td><td>DC Type 1+2 or DC Type 2<\/td><td>PV combiner box or DC distribution board<\/td><td>Ucpv, Iimp or In, Up<\/td><\/tr><tr><td>Sensitive loads located far from the main distribution board<\/td><td>Additional Type 2 or Type 3<\/td><td>Near the downstream equipment<\/td><td>Up, coordination<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong><strong>Paso 3: Determinar Iimp, In e Imax<\/strong><\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The discharge current rating of an SPD should be selected according to the expected surge energy, installation location, lightning exposure, and SPD type. The three main current parameters are Iimp, In, and Imax.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Iimp \u2013 Impulse Discharge Current<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Iimp represents the lightning impulse current that a Type 1 or Type 1+2 SPD can discharge under a 10\/350 \u03bcs waveform.<br>It is mainly used to evaluate the SPD\u2019s ability to withstand high-energy lightning currents at the service entrance or LPZ 0\u2013LPZ 1 boundary.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Common In ratings include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">10 kA for light-duty terminal protection<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">20 kA for general residential and commercial distribution<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">30\u201340 kA or higher for industrial and high-exposure installations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">For most main and sub-distribution boards, an In rating of 20 kA or higher is commonly selected.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Imax \u2013 Maximum Discharge Current<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Imax represents the maximum 8\/20 \u03bcs surge current that an SPD can discharge once or a limited number of times without failing.<br>Imax is normally higher than In, but it should not be used as the only selection criterion because it does not represent the SPD\u2019s repeated operating capability.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Typical Imax ratings include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">20\u201340 kA for general distribution systems<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">40\u201380 kA for industrial installations<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Higher values for severe surge environments<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Practical Selection Guide<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Installation Condition<\/strong><\/th><th><strong>Recommended Parameter Focus<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Building service entrance with lightning protection system<\/td><td>Prioritize Iimp<\/td><\/tr><tr><td>Tablero de distribuci\u00f3n principal o secundario<\/td><td>Prioritize In and Imax<\/td><\/tr><tr><td>High lightning exposure industrial facility<\/td><td>Higher Iimp and In<\/td><\/tr><tr><td>Sensitive terminal equipment<\/td><td>Lower Up is usually more important than a very high current rating<\/td><\/tr><tr><td>DPS Tipo 1+2<\/td><td>Check Iimp, In, Imax, and Up together<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<div class=\"wp-block-group has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-20 is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Nota de ingenier\u00eda<\/strong><br>A higher discharge current rating does not automatically mean better protection. SPD selection should balance discharge capacity, voltage protection level, installation location, backup protection, and energy coordination. An SPD with a very high Imax but an unsuitable Up or Uc may still fail to provide effective protection.<\/p>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Paso 4: Verificar el nivel de protecci\u00f3n de tensi\u00f3n Up<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The voltage protection level, <strong>Up<\/strong>, indicates the SPD\u2019s ability to limit surge voltage under specified test conditions. It is a declared value provided by the manufacturer and represents the protection level achieved when the SPD discharges the specified impulse current.<br>A lower Up generally means that less surge voltage is allowed to pass toward downstream equipment. However, Up should not be evaluated alone. It must be considered together with the system voltage, maximum continuous operating voltage Uc, discharge-current capacity, temporary overvoltage withstand capability, and the impulse withstand voltage of the protected equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Compare Up with the Equipment Impulse Withstand Voltage<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The selected SPD should limit the surge voltage to a level below the impulse withstand voltage of the downstream equipment.<br>A practical selection principle is:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><em>The effective protection level at the equipment should remain below the equipment\u2019s rated impulse withstand voltage.<\/em><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">A sufficient safety margin should be allowed because the actual voltage reaching the equipment may be higher than the Up value stated in the datasheet.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Consider Installation Cable Length<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The Up value is measured at the SPD terminals under specified laboratory conditions. In an actual installation, the inductance of the connecting conductors can add extra voltage during surge discharge.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Therefore:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Keep the connecting conductors as short and direct as possible.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Avoid unnecessary loops and sharp bends.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Position the SPD close to the protected circuit.<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Install additional downstream protection when the protected equipment is far from the main SPD.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Long connecting cables can reduce the effectiveness of even a low-Up SPD. Correct installation is therefore just as important as product selection. Phoenix Contact also notes that excessively long connection conductors can create installation problems and recommends attention to cable length and layout.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Practical Selection Focus<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Protection Position<\/strong><\/th><th><strong>Main Selection Focus<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Building service entrance<\/td><td>Balance Iimp and Up<\/td><\/tr><tr><td>Tablero de distribuci\u00f3n principal o secundario<\/td><td>Check In, Imax, and Up<\/td><\/tr><tr><td>Sensitive electronic equipment<\/td><td>Select a sufficiently low Up and install the SPD close to the load<\/td><\/tr><tr><td>Type 1+2 combined SPD<\/td><td>Check Iimp, In, and Up together<\/td><\/tr><tr><td>Long distance between distribution boards<\/td><td>Consider an additional downstream SPD<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-21 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Nota de ingenier\u00eda<\/strong>\uff1a<br>Do not select an SPD based only on the lowest Up value. An SPD with a low Up but insufficient discharge capacity may be damaged by the expected surge current. Conversely, an SPD with high discharge capacity but an excessively high Up may not adequately protect sensitive equipment.<br>The final selection should balance:<br><strong>Uc + Up + Iimp\/In\/Imax + equipment withstand voltage + installation distance<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Paso 5: Confirmar el n\u00famero de polos, el dispositivo de desconexi\u00f3n, la se\u00f1alizaci\u00f3n remota y la protecci\u00f3n de respaldo<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">After selecting the SPD type and electrical ratings, confirm that the device matches the system configuration and installation requirements. The number of poles, internal disconnection function, remote signaling option, and backup protective device all affect the safety and reliability of the installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Confirm the Number of Poles<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The SPD pole configuration should match the power system, conductor arrangement, and protection mode.<\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Sistema de alimentaci\u00f3n<\/strong><\/th><th><strong>Common SPD Configuration<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Single-phase L\u2013N system<\/td><td>1P+N or 2P<\/td><\/tr><tr><td>Three-phase three-wire system<\/td><td>3P<\/td><\/tr><tr><td>Three-phase four-wire system<\/td><td>3P+N or 4P<\/td><\/tr><tr><td>TN-C system<\/td><td>Protection between phase conductors and PEN<\/td><\/tr><tr><td>TN-S or TN-C-S system<\/td><td>Protection between L\u2013N and N\u2013PE, depending on the selected circuit<\/td><\/tr><tr><td>TT system<\/td><td>Commonly uses a 3+1 or 1+1 circuit<\/td><\/tr><tr><td>DC or PV system<\/td><td>Select the pole configuration according to system voltage, polarity, and grounding arrangement<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The number of poles alone is not enough to determine suitability. The protection circuit must also match the system earthing arrangement and the voltage that may appear between conductors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check the Disconnection Device<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Most SPDs include an internal thermal disconnection device that separates the protective component from the power system when it reaches the end of its service life or overheats.<br>The disconnection device helps reduce the risk of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Thermal runaway<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Overheating<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Short circuit<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Fire caused by a failed MOV or other protective component<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The SPD should also provide a clear status indicator so that maintenance personnel can identify when the protection module needs replacement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Determine Whether Remote Signaling Is Required<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">A remote signaling contact allows the SPD operating status to be monitored from a control panel, alarm system, PLC, or building management system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Remote signaling is particularly useful in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Unattended substations<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Industrial production lines<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Data centers<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Telecom facilities<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Solar PV plants<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Critical power systems<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">When remote monitoring is required, check the contact type, terminal arrangement, rated voltage, and rated current of the signaling contact.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Select the Backup Protective Device<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">An SPD may require an upstream fuse or circuit breaker to protect the circuit if the SPD fails or develops an internal short circuit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The backup protective device should be selected according to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The manufacturer\u2019s specified maximum backup fuse or circuit breaker<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The available short-circuit current at the installation point<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The SPD\u2019s short-circuit current rating<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The type and cross-sectional area of the connecting conductors<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Coordination with the upstream protective device<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Do not select the backup fuse or circuit breaker only according to the SPD discharge-current rating. Follow the manufacturer\u2019s coordination table and installation instructions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Practical Selection Guide<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Elemento de selecci\u00f3n<\/strong><\/th><th><strong>Main Point to Confirm<\/strong><\/th><\/tr><\/thead><tbody><tr><td>N\u00famero de polos<\/td><td>Match the phase conductors, neutral conductor, and earthing system<\/td><\/tr><tr><td>Disconnection device<\/td><td>Confirm internal thermal disconnection and visible status indication<\/td><\/tr><tr><td>Remote signaling<\/td><td>Confirm whether remote alarm or system monitoring is required<\/td><\/tr><tr><td>Backup protection<\/td><td>Follow the manufacturer\u2019s recommended fuse or circuit-breaker rating<\/td><\/tr><tr><td>Replaceable module<\/td><td>Check whether the protection cartridge can be replaced without changing the base<\/td><\/tr><tr><td>Short-circuit rating<\/td><td>Confirm suitability for the prospective short-circuit current<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-22 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Nota de ingenier\u00eda<\/strong><br>An SPD with the correct Uc, Up, and discharge-current rating may still be unsuitable if the pole configuration or backup protection is incorrect. Always verify the complete installation arrangement rather than selecting the SPD only from its front-label parameters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Paso 6: Verificar la coordinaci\u00f3n de energ\u00eda entre m\u00faltiples DPS<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">When several SPDs are installed at different levels of the electrical system, they must operate in a coordinated sequence. The upstream SPD should discharge the highest surge energy, while the downstream SPD further reduces the residual voltage before it reaches sensitive equipment.<br>Proper energy coordination prevents a downstream SPD from being overloaded before the upstream device has diverted the main surge current.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Typical Cascaded Protection Arrangement<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Protection Level<\/strong><\/th><th><strong>Typical SPD Type<\/strong><\/th><th><strong>Typical Installation Location<\/strong><\/th><th><strong>Funci\u00f3n principal<\/strong><\/th><\/tr><\/thead><tbody><tr><td>First stage<\/td><td>Type 1 or Type 1+2<\/td><td>Service entrance or main switchboard<\/td><td>Discharge high-energy lightning currents<\/td><\/tr><tr><td>Second stage<\/td><td>Type 2<\/td><td>Sub-distribution board or control cabinet<\/td><td>Limit residual surges and switching overvoltages<\/td><\/tr><tr><td>Final stage<\/td><td>Type 3<\/td><td>Close to sensitive equipment<\/td><td>Further reduce residual voltage<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Check the Distance Between SPDs<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Cable length between two SPDs affects how surge energy is shared. The inductance of the connecting cable can help create the voltage difference required for the upstream and downstream SPDs to operate in the correct sequence.<br>However, there is no single spacing rule that applies to every SPD combination. The required distance depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">SPD technology and internal design<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Upstream and downstream Up values<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Discharge-current ratings<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Cable routing and conductor length<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Manufacturer-tested coordination data<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Some installations use cable length to provide natural decoupling. Where the available distance is insufficient, a coordinated SPD combination or a specified decoupling element may be required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Use Manufacturer-Verified Combinations<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The safest method is to select upstream and downstream SPDs that have been tested and confirmed as an energy-coordinated combination by the manufacturer.<br>Check the manufacturer\u2019s documentation for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Permitted upstream and downstream SPD combinations<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Minimum separation distance<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Whether an additional decoupling element is required<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Maximum discharge-current capability<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Backup protective device requirements<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Effective voltage protection level at the load<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Do not assume that two SPDs are coordinated simply because one is Type 1 and the other is Type 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Consider the Distance to the Protected Equipment<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">When sensitive equipment is located far from the main SPD, an additional downstream SPD may be necessary. Long cables can pick up new induced surges and can also increase the voltage reaching the equipment.<br>For long distribution circuits, consider installing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Type 2 protection in downstream distribution boards<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Type 3 protection close to sensitive terminal equipment<\/li>\n\n\n\n<li style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Additional SPDs where required by the project design or manufacturer\u2019s instructions<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Practical Coordination Checklist<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Item to Verify<\/strong><\/th><th><strong>Selection Requirement<\/strong><\/th><\/tr><\/thead><tbody><tr><td>SPD sequence<\/td><td>Type 1 or Type 1+2 upstream, followed by Type 2 and Type 3 where required<\/td><\/tr><tr><td>Energy capacity<\/td><td>Upstream SPD handles the highest surge energy<\/td><\/tr><tr><td>Voltage limitation<\/td><td>Downstream SPD provides a lower effective protection level<\/td><\/tr><tr><td>Separation distance<\/td><td>Follow manufacturer-tested requirements<\/td><\/tr><tr><td>Cable layout<\/td><td>Keep all SPD connections short and direct<\/td><\/tr><tr><td>Product compatibility<\/td><td>Use verified coordinated combinations where possible<\/td><\/tr><tr><td>Protected-equipment distance<\/td><td>Add downstream protection when the load is far from the main SPD<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-23 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Nota de ingenier\u00eda<\/strong><br>Energy coordination is not achieved simply by installing several SPDs in series. The devices must share surge energy correctly without overloading the downstream unit.<br>A poorly coordinated system may cause the Type 2 or Type 3 SPD to operate too early and absorb more energy than it can withstand. Final coordination should therefore follow the manufacturer\u2019s tested combination data and installation instructions.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--70)\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-24\"><strong>Where Are Surge Protective Devices Commonly Used?<\/strong><\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Surge protective devices are widely used in residential, commercial, industrial, communication, renewable energy, transportation, and outdoor electrical systems. Their main purpose is to protect electrical and electronic equipment from transient overvoltages caused by lightning, switching operations, and power system disturbances.<br>The required SPD type depends on the system voltage, installation location, earthing arrangement, equipment sensitivity, and expected surge exposure.<\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Application<\/strong><\/th><th><strong>Typical Equipment Protected<\/strong><\/th><th><strong>Common Protection Approach<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Residential buildings<\/td><td>Household appliances, computers, security systems, and smart home devices<\/td><td>Type 2 at the main distribution board; Type 1 or Type 1+2 may be required for buildings with external lightning protection<\/td><\/tr><tr><td>Commercial buildings<\/td><td>Elevators, HVAC systems, fire alarms, CCTV, servers, and building management systems<\/td><td>Type 1 or Type 1+2 at the service entrance, followed by Type 2 protection in downstream boards<\/td><\/tr><tr><td>Industrial facilities<\/td><td>PLCs, variable-frequency drives, sensors, automation equipment, and production lines<\/td><td>Coordinated Type 1, Type 2, and Type 3 protection<\/td><\/tr><tr><td>Data centers and communication systems<\/td><td>Servers, UPS systems, network equipment, communication devices, and signal lines<\/td><td>Power-line SPDs combined with dedicated data and signal-line protection<\/td><\/tr><tr><td>Sistemas solares fotovoltaicos<\/td><td>PV modules, combiner boxes, inverters, and AC\/DC distribution circuits<\/td><td>DC SPDs on the PV side and AC SPDs on the inverter output side<\/td><\/tr><tr><td>EV charging stations<\/td><td>AC chargers, DC fast chargers, controllers, payment modules, and communication equipment<\/td><td>SPD protection at the incoming supply and charging equipment<\/td><\/tr><tr><td>Wind power and energy storage systems<\/td><td>Converters, inverters, battery management systems, control cabinets, and monitoring equipment<\/td><td>AC and DC SPDs selected according to the system architecture<\/td><\/tr><tr><td>Outdoor equipment and LED lighting<\/td><td>Streetlights, traffic systems, cameras, electronic signs, and outdoor control cabinets<\/td><td>Local SPD protection close to exposed outdoor equipment<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-palette-color-4-color has-text-color has-link-color wp-elements-25 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>In practice, larger or more complex systems usually require multi-stage surge protection. A high-energy SPD may be installed at the main service entrance, while additional Type 2 or Type 3 SPDs are installed closer to downstream distribution boards and sensitive equipment.<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--70)\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-26\"><strong>Where Should a Surge Protective Device Be Installed?<\/strong><\/h2>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">The effectiveness of a surge protective device depends not only on selecting the correct SPD type, but also on installing it at the appropriate location within the electrical system. Proper installation helps ensure that surge energy is safely diverted to earth before it reaches sensitive electrical or electronic equipment.<br>In most low-voltage installations, SPDs are installed in stages to provide coordinated protection from the service entrance to the final load.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.234), 17px);\"><strong>Typical SPD Installation Locations<\/strong><\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Ubicaci\u00f3n de instalaci\u00f3n<\/strong><\/th><th><strong>Recommended SPD Type<\/strong><\/th><th><strong>Primary Purpose<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Entrada de servicio<\/td><td>Type 1 or Type 1+2<\/td><td>Divert high-energy lightning currents entering the building<\/td><\/tr><tr><td>Main distribution board<\/td><td>Type 2<\/td><td>Protect downstream electrical circuits from switching surges and residual lightning surges<\/td><\/tr><tr><td>Sub-distribution board<\/td><td>Type 2<\/td><td>Provide additional protection for branch circuits<\/td><\/tr><tr><td>Close to sensitive equipment<\/td><td>Type 3<\/td><td>Reduce the remaining surge voltage before it reaches sensitive electronic equipment<\/td><\/tr><tr><td>PV combiner box or DC distribution board<\/td><td>DC Type 1+2 or DC Type 2<\/td><td>Protect photovoltaic DC circuits and inverters<\/td><\/tr><tr><td>Control cabinets and communication systems<\/td><td>Type 2, Type 3, or signal-line SPDs<\/td><td>Protect PLCs, communication equipment, and control electronics<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Installation Recommendations<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">To achieve the best protection performance, SPDs should be installed as close as possible to the equipment or distribution point they protect. The connecting conductors should be short and direct to minimize additional inductive voltage during surge discharge.<br>When the distance between the main SPD and the protected equipment is relatively long, an additional downstream SPD may be required to maintain an effective protection level.<\/p>\n\n\n\n<div class=\"wp-block-group has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-27 is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"wp-block-paragraph\">When planning an SPD installation, the following principles should always be considered:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Install the appropriate SPD type at each protection level.<\/li>\n\n\n\n<li>Keep all connecting conductors as short and straight as possible.<\/li>\n\n\n\n<li>Ensure reliable bonding to the earthing system.<\/li>\n\n\n\n<li>Follow the manufacturer\u2019s recommendations for backup protection and coordination.<\/li>\n\n\n\n<li>Use coordinated multi-stage protection for large or complex electrical installations.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--70)\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-28\"><strong>Common SPD Installation Mistakes<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"667\" height=\"284\" src=\"https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/common-spd-installation-mistakes.png\" alt=\"Illustration of common surge protective device (SPD) installation mistakes, including incorrect grounding, excessive lead length, poor coordination, and improper installation practices.\" class=\"wp-image-1745\" style=\"aspect-ratio:2.3486835417302023;width:722px;height:auto\" srcset=\"https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/common-spd-installation-mistakes.png 667w, https:\/\/jutrion.com\/wp-content\/uploads\/2026\/07\/common-spd-installation-mistakes-300x128.png 300w\" sizes=\"auto, (max-width: 667px) 100vw, 667px\" \/><\/figure>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">Even a correctly selected surge protective device may fail to provide effective protection if it is installed incorrectly. Common installation mistakes can increase the residual voltage, reduce the SPD\u2019s service life, or prevent the surge current from being safely diverted.The following issues should be checked during installation and commissioning.<\/p>\n\n\n\n<figure style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Common Mistake<\/strong><\/th><th><strong>Why It Is a Problem<\/strong><\/th><th><strong>Recommended Practice<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Installing the wrong SPD type<\/td><td>A Type 2 or Type 3 SPD may not be able to withstand the surge energy expected at the service entrance<\/td><td>Match the SPD type to the installation location and surge exposure<\/td><\/tr><tr><td>Selecting an incorrect Uc<\/td><td>A Uc value that is too low may cause premature operation or damage; a value that is too high may reduce protection effectiveness<\/td><td>Select Uc according to the system voltage and earthing arrangement<\/td><\/tr><tr><td>Using excessively long connecting conductors<\/td><td>Long conductors add inductive voltage during surge discharge and increase the effective protection level<\/td><td>Keep the connection path short, direct, and free from unnecessary loops<\/td><\/tr><tr><td>Poor earthing or equipotential bonding<\/td><td>A high-impedance earth path can prevent surge current from being discharged effectively<\/td><td>Ensure reliable earthing and equipotential bonding<\/td><\/tr><tr><td>Ignoring backup protection<\/td><td>An internal SPD fault may not be safely disconnected from the power system<\/td><td>Install the fuse or circuit breaker specified by the manufacturer<\/td><\/tr><tr><td>Installing only one SPD in a large system<\/td><td>A single SPD may not provide sufficient protection for distant distribution boards or sensitive loads<\/td><td>Use coordinated multi-stage protection where required<\/td><\/tr><tr><td>Using an incorrect pole or circuit configuration<\/td><td>The SPD may not protect all required conductors or may be unsuitable for the earthing system<\/td><td>Match the SPD circuit to the phase, neutral, polarity, and grounding arrangement<\/td><\/tr><tr><td>Failing to coordinate multiple SPDs<\/td><td>A downstream SPD may absorb more surge energy than it can withstand<\/td><td>Use manufacturer-verified coordinated combinations<\/td><\/tr><tr><td>Installing the SPD too far from the protected equipment<\/td><td>Long downstream cables may allow additional induced surges or increase the voltage reaching the equipment<\/td><td>Add downstream Type 2 or Type 3 protection when necessary<\/td><\/tr><tr><td>Failing to inspect or replace a failed SPD<\/td><td>Once the SPD reaches end of life, the circuit may no longer be protected<\/td><td>Check the status indicator and replace failed modules promptly<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>To avoid these mistakes:<\/strong><\/p>\n\n\n\n<ul style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\" class=\"wp-block-list\">\n<li>Select the SPD according to the system voltage, earthing arrangement, and installation location.<\/li>\n\n\n\n<li>Keep the total connection path as short and direct as practical.<\/li>\n\n\n\n<li>Use the correct backup protective device.<\/li>\n\n\n\n<li>Ensure reliable earthing and equipotential bonding.<\/li>\n\n\n\n<li>Verify coordination between upstream and downstream SPDs.<\/li>\n\n\n\n<li>Inspect the SPD status indicator during routine maintenance.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-29 wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\"><strong>Nota de ingenier\u00eda<\/strong><br>The SPD itself is only one part of the surge protection system. Its actual performance also depends on conductor routing, earthing quality, backup protection, installation distance, and coordination with other SPDs.<br>A high-performance SPD can still provide poor protection if the installation layout is incorrect.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\" style=\"margin-top:var(--wp--preset--spacing--70)\">\n<h2 class=\"wp-block-heading has-palette-color-9-color has-text-color has-link-color has-large-font-size wp-elements-30\"><strong>Frequently Asked Questions About Surge Protective Devices<\/strong><\/h2>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong>Can an SPD Be Used Without a Backup Fuse or Circuit Breaker?<\/strong><\/h3>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">It depends on the SPD design and the manufacturer\u2019s installation requirements. Some SPDs require an external backup fuse or circuit breaker, while others may include integrated overcurrent protection.<br>The backup protective device is used to disconnect the SPD safely if it develops an internal short circuit or reaches the end of its service life. Its rating should not be selected only according to the SPD\u2019s discharge-current rating.<br>Always follow the manufacturer\u2019s specified maximum backup fuse or circuit-breaker rating, short-circuit current requirements, and coordination instructions.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong><strong>How Should a Surge Protective Device Be Maintained?<\/strong><\/strong><\/h3>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">SPD maintenance mainly involves regular inspection rather than internal repair. During routine electrical maintenance, check the status indicator, remote signaling contact, terminal tightness, signs of overheating, and the condition of the backup protective device.<br>The SPD should also be inspected after severe thunderstorms, lightning events, major power-system faults, or repeated tripping of the upstream protective device.<br>Replace the SPD or plug-in protection module if:<\/p>\n\n\n\n<ul class=\"wp-block-list has-small-font-size\">\n<li>The status indicator shows failure.<\/li>\n\n\n\n<li>A remote alarm is activated.<\/li>\n\n\n\n<li>The enclosure is discolored, cracked, or overheated.<\/li>\n\n\n\n<li>The backup fuse or circuit breaker has operated because of an SPD fault.<\/li>\n\n\n\n<li>The manufacturer\u2019s replacement criteria have been reached.<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong><strong>How Long Does a Surge Protective Device Last?<\/strong><\/strong><\/h3>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">An SPD does not have a fixed service life. Its lifespan depends on the number, magnitude, and duration of the surges it absorbs, as well as system voltage, temporary overvoltages, environmental conditions, and product quality.<br>An SPD may remain operational for many years in a low-surge environment, but a single severe surge can significantly reduce its remaining capacity or cause immediate failure.<br>The status indicator and remote signaling contact should therefore be used to determine whether the SPD is still operational. Replacement should be based on actual condition and manufacturer guidance rather than a fixed number of years alone.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong><strong><strong>Do I Need Both AC and DC Surge Protection?<\/strong><\/strong><\/strong><\/h3>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">Both AC and DC surge protection may be required when a system contains separate AC and DC circuits. An AC SPD cannot automatically replace a DC SPD because the two devices are designed for different voltage characteristics, arc-extinguishing requirements, and system configurations.<br>For example, a solar PV system may require:<\/p>\n\n\n\n<ul class=\"wp-block-list has-small-font-size\">\n<li>A DC SPD on the PV array, combiner box, or inverter DC input.<\/li>\n\n\n\n<li>An AC SPD on the inverter output or AC distribution board.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">Energy storage systems, EV charging systems, and industrial DC control circuits may also require separate AC and DC protection.<br>The selected SPD must be rated for the actual system voltage, polarity, grounding arrangement, and maximum continuous operating voltage.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong><strong><strong><strong>Can a Damaged SPD Continue Protecting Equipment?<\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">A damaged SPD should not be assumed to provide effective protection. Some SPDs contain an internal disconnection device that isolates the failed protection component while allowing the electrical circuit to remain energized.<br>In this condition, the connected equipment may continue operating, but surge protection may already be partially or completely lost.<br>If the status indicator shows failure or the remote alarm is activated, replace the SPD or protection module as soon as possible. Continuing to operate without replacement may leave downstream equipment unprotected.<\/p>\n<\/blockquote>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading has-medium-font-size\"><strong><strong><strong><strong><strong>Are SPDs Required for Solar PV Systems?<\/strong><\/strong><\/strong><\/strong><\/strong><\/h3>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">SPD requirements for solar PV systems depend on the applicable electrical standard, lightning protection design, installation risk, cable routing, and local regulations.<br>PV systems are particularly exposed to induced surges because modules and DC cables are usually installed outdoors and may cover a large area. SPDs are commonly installed on the DC side, AC side, or both.<br>Typical locations include:<\/p>\n\n\n\n<ul class=\"wp-block-list has-small-font-size\">\n<li>PV combiner boxes<\/li>\n\n\n\n<li>Inverter DC inputs<\/li>\n\n\n\n<li>Inverter AC outputs<\/li>\n\n\n\n<li>Main AC distribution boards<\/li>\n<\/ul>\n\n\n\n<p class=\"has-small-font-size wp-block-paragraph\">The required SPD type depends on whether the building has an external lightning protection system, the separation distance, the system voltage, and the lightning exposure level.<br>Therefore, SPDs are not selected simply because the system is photovoltaic. The need, type, and installation position should be determined by the applicable project requirements and risk assessment.<\/p>\n<\/blockquote>\n\n\n\n<div class=\"wp-block-group has-palette-color-6-background-color has-background is-layout-constrained wp-block-group-is-layout-constrained\" style=\"margin-top:var(--wp--preset--spacing--70);margin-bottom:var(--wp--preset--spacing--70)\">\n<p class=\"has-text-align-left has-palette-color-9-color has-text-color has-link-color has-medium-font-size wp-elements-31 wp-block-paragraph\"><strong><strong>LOOKING FOR A SUITABLE SPD FOR YOUR PROJECT?<\/strong><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:clamp(14px, 0.875rem + ((1vw - 3.2px) * 0.078), 15px);\">After understanding the different SPD types, selection parameters, installation locations, and coordination requirements, you may also explore our complete range of surge protective devices for AC and DC applications.<br>Visit our <strong><a href=\"https:\/\/jutrion.com\/es\/spd\/\"><em>Surge Protective Devices (SPD) product<\/em><\/a><\/strong> category to compare available models, voltage ratings, discharge current levels, pole configurations, and application options.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-palette-color-8-color has-palette-color-9-background-color has-text-color has-background has-link-color wp-elements-32 is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>ABOUT THIS GUIDE<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide was prepared to help engineers, panel builders, electrical contractors, system integrators, and industrial buyers better understand surge protective devices (SPDs), their operating principles, selection criteria, installation practices, and common applications.<\/p>\n<\/div>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<p class=\"has-palette-color-4-color has-text-color has-link-color has-large-font-size wp-elements-33 wp-block-paragraph\"><strong>REFERENCES AND TECHNICAL SOURCES<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2060<a href=\"https:\/\/webstore.iec.ch\/en\/publication\/65314?utm_source.com\" target=\"_blank\" rel=\"noopener\">IEC 61643-11:2025 \u2013 Low-Voltage Surge Protective Devices \u2013 Requirements and Test Methods<\/a> \u2014 International Electrotechnical Commission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/32531\" target=\"_blank\" rel=\"noopener\">IEC 61643-12 \u2013 Low-Voltage Surge Protective Devices \u2013 Selection and Application Principles<\/a> \u2014 International Electrotechnical Commission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ul.com\/services\/surge-protection-device-testing-and-certification-services?utm_source.com\" target=\"_blank\" rel=\"noopener\">UL 1449 \u2013 Standard for Surge Protective Devices<\/a> \u2014 UL Solutions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\/70?utm_source.com\" target=\"_blank\" rel=\"noopener\">NFPA 70 \u2013 National Electrical Code (NEC) <\/a>\u2014 National Fire Protection Association.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/standards.ieee.org\/ieee\/C62.41.2\/2859\/?utm_source.com\" target=\"_blank\" rel=\"noopener\">\u2060IEEE C62.41.2 \u2013 Recommended Practice on Characterization of Surges in Low-Voltage AC Power Circuits<\/a> \u2014 Institute of Electrical and Electronics Engineers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.nema.org\/membership\/products\/view\/low-voltage-surge-protective-devices?utm_source.com\" target=\"_blank\" rel=\"noopener\">NEMA \u2013 Low Voltage Surge Protective Devices Guidance<\/a>\u2014 National Electrical Manufacturers Association.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/29590\" target=\"_blank\" rel=\"noopener\">\u2060IEC 62305-4 \u2013 Protection Against Lightning \u2013 Electrical and Electronic Systems Within Structures<\/a>\u2014 International Electrotechnical Commission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/webstore.iec.ch\/en\/publication\/30774\" target=\"_blank\" rel=\"noopener\">IEC 61643-32 \u2013 Surge Protective Devices Connected to the DC Side of Photovoltaic Installations<\/a>\u2014 International Electrotechnical Commission.<\/p>\n<\/div>\n<\/blockquote>","protected":false},"excerpt":{"rendered":"<p>What Is a Surge Protective Device (SPD)? A Surge Protective Device (SPD) is an electrical protection device designed to limit transient overvoltages and divert surge currents. Under normal operating conditions, the SPD remains in a high-impedance state and has little to no effect on the electrical system. When lightning, utility switching, motor starting and stopping, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1746,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"[]"},"categories":[1],"tags":[],"class_list":["post-1741","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical-guides"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/posts\/1741","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/comments?post=1741"}],"version-history":[{"count":2,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/posts\/1741\/revisions"}],"predecessor-version":[{"id":1747,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/posts\/1741\/revisions\/1747"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/media\/1746"}],"wp:attachment":[{"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/media?parent=1741"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/categories?post=1741"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jutrion.com\/es\/wp-json\/wp\/v2\/tags?post=1741"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}