{"id":1778,"date":"2026-07-27T10:15:15","date_gmt":"2026-07-27T02:15:15","guid":{"rendered":"https:\/\/jutrion.com\/?page_id=1778"},"modified":"2026-07-27T11:06:45","modified_gmt":"2026-07-27T03:06:45","slug":"%d8%a7%d9%84%d8%a3%d8%af%d9%88%d8%a7%d8%aa","status":"publish","type":"page","link":"https:\/\/jutrion.com\/ar\/tools\/","title":{"rendered":"\u0623\u062f\u0648\u0627\u062a"},"content":{"rendered":"\n<!-- ===== JUTRION Electrical Calculators Hub (full design) \u2014 paste into ONE WordPress \"Custom HTML\" block.\n     Self-contained: styles + script included. 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.category-tabs button{font-size:12px}\n.jt-hub .category-tabs button span{font-size:12px}\n.jt-hub .tools-search input{font-size:14px}\n.jt-hub .tool-id{font-size:11px}\n.jt-hub .tool-kind{font-size:10px}\n.jt-hub .category-name{font-size:10px}\n.jt-hub .tool-card h3{font-size:19px}\n.jt-hub .card-description{font-size:13px}\n.jt-hub .io-row small{font-size:10px}\n.jt-hub .io-row strong{font-size:12px}\n.jt-hub .logic-note{font-size:12px}\n.jt-hub .card-action{font-size:13px}\n.jt-hub .empty-state span{font-size:14px}\n.jt-hub .conversion-section p:last-child{font-size:13px}\n.jt-hub .jt-btn{font-size:13px}\n<\/style>\n\n  <section class=\"hero\">\n    <div class=\"hero-copy\">\n      <p class=\"eyebrow\">Free electrical engineering tools<\/p>\n      <h1>Turn electrical inputs into usable design parameters.<\/h1>\n      <p class=\"hero-lede\">A connected set of engineering calculators for circuit protection, motor control, surge protection, voltage monitoring, and solar DC applications.<\/p>\n      <div class=\"hero-proof\">\n        <div><strong>25<\/strong><span>parameter tools<\/span><\/div>\n        <div><strong>6<\/strong><span>engineering categories<\/span><\/div>\n        <div><strong>IEC<\/strong><span>focused reference<\/span><\/div>\n      <\/div>\n    <\/div>\n    <div class=\"parameter-board\">\n      <div class=\"board-topline\"><span>JUTRION parameter path<\/span><span class=\"board-status\"><i><\/i> Reference mode<\/span><\/div>\n      <div class=\"signal-path\">\n        <div class=\"signal-node input-node\"><span>01 \/ Input<\/span><strong>Project data<\/strong><small>Load \u00b7 source \u00b7 installation<\/small><\/div>\n        <div class=\"signal-line\"><i><\/i><b>\u2192<\/b><\/div>\n        <div class=\"signal-node calc-node\"><span>02 \/ Process<\/span><strong>Engineering check<\/strong><small>Formula + conditional logic<\/small><\/div>\n        <div class=\"signal-line\"><i><\/i><b>\u2192<\/b><\/div>\n        <div class=\"signal-node output-node\"><span>03 \/ Output<\/span><strong>Required parameters<\/strong><small>Current \u00b7 rating \u00b7 limits<\/small><\/div>\n      <\/div>\n      <div class=\"board-readout\">\n        <div><small>Direct calculation<\/small><strong>Numeric result<\/strong><span>Formula-derived<\/span><\/div>\n        <div><small>Conditional check<\/small><strong>Selection range<\/strong><span>Requires verification<\/span><\/div>\n      <\/div>\n    <\/div>\n  <\/section>\n\n  <section class=\"workflow-section\">\n    <div class=\"section-intro\">\n      <div><p class=\"eyebrow\">Guided workflow<\/p><h2>The JUTRION calculation chain<\/h2><\/div>\n      <p>Move from source and load data to protection parameters through smaller checks that can be reviewed independently.<\/p>\n    <\/div>\n    <div class=\"workflow\">\n      <div><span class=\"step-no\">01<\/span><span class=\"step-icon\">A<\/span><span class=\"txt\"><strong>Calculate load current<\/strong><small>Power, voltage and phase \u2192 Ib<\/small><\/span><i>\u2192<\/i><\/div>\n      <div><span class=\"step-no\">02<\/span><span class=\"step-icon\">In<\/span><span class=\"txt\"><strong>Estimate breaker rating<\/strong><small>Ib, margin and cable Iz \u2192 In<\/small><\/span><i>\u2192<\/i><\/div>\n      <div><span class=\"step-no\">03<\/span><span class=\"step-icon\">kA<\/span><span class=\"txt\"><strong>Check fault current<\/strong><small>Source impedance \u2192 prospective Isc<\/small><\/span><i>\u2192<\/i><\/div>\n      <div><span class=\"step-no\">04<\/span><span class=\"step-icon\">\u2713<\/span><span class=\"txt\"><strong>Confirm device duty<\/strong><small>Isc and voltage \u2192 Icu check<\/small><\/span><i>\u2713<\/i><\/div>\n    <\/div>\n    <div class=\"relationship\"><span>Protection relationship<\/span><strong>Ib \u2264 In \u2264 Iz<\/strong><i>+<\/i><strong>Icu \u2265 prospective fault current<\/strong><\/div>\n  <\/section>\n\n  <section class=\"tools-section\">\n    <div class=\"tools-heading\">\n      <div><p class=\"eyebrow\">Engineering calculators<\/p><h2>Find the right calculation<\/h2><\/div>\n      <label class=\"tools-search\"><span aria-hidden=\"true\">\u2315<\/span><input type=\"search\" id=\"jtHubSearch\" placeholder=\"Search all tools\"><\/label>\n    <\/div>\n    <div class=\"category-tabs\" id=\"jtHubTabs\">\n      <button class=\"active\" type=\"button\" data-category=\"all\">All tools <span>25<\/span><\/button>\n      <button type=\"button\" data-category=\"distribution\">Power distribution <span>5<\/span><\/button>\n      <button type=\"button\" data-category=\"protection\">Circuit protection <span>7<\/span><\/button>\n      <button type=\"button\" data-category=\"motor\">Motor &amp; switching <span>4<\/span><\/button>\n      <button type=\"button\" data-category=\"surge\">Surge &amp; voltage <span>2<\/span><\/button>\n      <button type=\"button\" data-category=\"solar\">Solar &amp; DC <span>7<\/span><\/button>\n    <\/div>\n\n    <div class=\"tools-grid\" id=\"jtHubGrid\">\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:3\" data-priority-line=\"2\" data-category=\"protection\" data-search=\"mccb short circuit current fault icu breaker transformer\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201301<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>Short-Circuit Current &amp; Icu Calculator<\/h3>\n        <p class=\"card-description\">Estimate transformer-secondary terminal fault current, then compare it with the breaker breaking capacity at the operating voltage.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>kVA \u00b7 VLL \u00b7 Z% \u00b7 phase<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>In \u00b7 Isc \u00b7 Icu check<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Optional:<\/b> upstream contribution and feeder impedance for a fuller result.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/short-circuit-current-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card featured priority-card\" style=\"--priority-rank:1\" data-priority-line=\"1\" data-category=\"protection\" data-search=\"circuit breaker mcb mccb size rating current cable ib in iz\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201302<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>Circuit Breaker Sizing Calculator<\/h3>\n        <p class=\"card-description\">Calculate design current and screen a standard breaker rating against the cable current-carrying capacity.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>kW\/kVA\/A \u00b7 V \u00b7 PF \u00b7 Iz<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>Ib \u00b7 In \u00b7 Ib\u2264In\u2264Iz<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Separated:<\/b> B, C, or D curve suitability is checked in the inrush tool.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/circuit-breaker-sizing-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:2\" data-priority-line=\"1\" data-category=\"protection\" data-search=\"mcb inrush curve b c d instantaneous fault magnetic\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201303<\/span><span class=\"tool-kind conditional\">Conditional check<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>MCB Inrush &amp; Curve Checker<\/h3>\n        <p class=\"card-description\">Compare equipment inrush and available fault current with the magnetic-trip bands of B, C, and D curves.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>In \u00b7 inrush \u00b7 duration \u00b7 Isc<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>band comparison \u00b7 screen<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Not a guarantee:<\/b> final performance follows the exact manufacturer curve.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/mcb-inrush-curve-checker\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:4\" data-priority-line=\"3\" data-category=\"surge\" data-search=\"spd surge protective device type uc up earthing tn tt lightning\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013SV\u201301<\/span><span class=\"tool-kind conditional\">Conditional check<\/span><\/div>\n        <p class=\"category-name\">Surge &amp; voltage<\/p><h3>SPD Parameter Selection Check<\/h3>\n        <p class=\"card-description\">Translate supply arrangement, installation point, lightning exposure, and equipment withstand into a preliminary SPD requirement.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>standard \u00b7 V \u00b7 TN\/TT\/IT \u00b7 location<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>type \u00b7 Uc \u00b7 Up \u00b7 connection<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Important:<\/b> Up is a coordination target and product value, not calculated from voltage alone.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/spd-selector\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:5\" data-priority-line=\"4\" data-category=\"motor\" data-search=\"ats automatic transfer switch load current poles ac33\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013PD\u201301<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Motor &amp; switching<\/p><h3>ATS Sizing Calculator<\/h3>\n        <p class=\"card-description\">Convert the load into design current, the AC-31\/AC-33 category, a standard ATS rating, and the pole configuration.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>kW\/kVA \u00b7 V \u00b7 PF \u00b7 character<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>A \u00b7 category \u00b7 rating \u00b7 poles<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Decision:<\/b> switched neutral and poles depend on the earthing and source.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/ats-sizing-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:6\" data-priority-line=\"4\" data-category=\"motor\" data-search=\"generator genset sizing ats kva kw motor starting reserve\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013MC\u201302<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Motor &amp; switching<\/p><h3>Generator Capacity for ATS<\/h3>\n        <p class=\"card-description\">Estimate generator kW and kVA from diversified running load, the largest starting step, reserve, and environmental derating.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>run kW \u00b7 start kVA \u00b7 reserve<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>genset kW\/kVA \u00b7 ATS A<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Required:<\/b> confirm voltage dip and transient with the generator maker.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/generator-sizing-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:7\" data-priority-line=\"5\" data-category=\"protection\" data-search=\"breaker accessory shunt trip undervoltage release auxiliary motor operator coil va\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201307<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>Breaker Accessory Power Calculator<\/h3>\n        <p class=\"card-description\">Estimate control-supply demand for shunt trips, undervoltage releases, motor operators, and related breaker accessories.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>accessory \u00b7 coil V \u00b7 VA \u00b7 qty<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>peak VA \u00b7 steady VA \u00b7 margin<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Compatibility:<\/b> series, frame, AC\/DC, contacts, and mounting must match.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/breaker-accessory-power-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:8\" data-priority-line=\"6\" data-category=\"protection\" data-search=\"afdd arc fault rcbo circuit rating requirement premises code\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201305<\/span><span class=\"tool-kind conditional\">Conditional check<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>AFDD Requirement &amp; Selection<\/h3>\n        <p class=\"card-description\">Collect circuit and market information to define an AFDD or integrated AFDD-RCBO requirement and architecture.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>market \u00b7 premises \u00b7 circuit \u00b7 In<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>status \u00b7 architecture \u00b7 rating<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Not universal:<\/b> whether AFDD is required depends on local rules.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/afdd-requirement-selector\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:9\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"pv solar string voc isc temperature dc voltage modules inverter\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201301<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>PV String Voltage Calculator<\/h3>\n        <p class=\"card-description\">Calculate cold-condition string open-circuit voltage and screen the module count against inverter voltage limits.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>Voc \u00b7 \u03b2Voc \u00b7 Tmin \u00b7 Vdc max<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>cold Voc \u00b7 max modules<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Required:<\/b> use module and inverter datasheet limits.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/pv-string-voltage-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:10\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"pv dc ats automatic transfer switch solar battery current voltage\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201307<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>PV DC ATS Calculator<\/h3>\n        <p class=\"card-description\">Calculate DC design current and organize the voltage, pole, source, and transfer requirements for a solar or battery DC ATS.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>kW\/A \u00b7 Vdc \u00b7 sources \u00b7 polarity<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>A \u00b7 Ue \u00b7 poles \u00b7 check<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>DC-specific:<\/b> verify switching, isolation, and arc interruption at Vdc.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/pv-dc-ats-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:11\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"dc breaker sizing mcb mccb pv battery current voltage cable\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201302<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>DC MCB &amp; MCCB Rating Calculator<\/h3>\n        <p class=\"card-description\">Calculate DC design current and screen rated current, operating voltage, poles, cable capacity, and breaking capacity.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>source \u00b7 Idc \u00b7 Vdc \u00b7 Iz \u00b7 Isc<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>In \u00b7 Ue \u00b7 poles \u00b7 Icu<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Critical:<\/b> DC poles and series connection follow the breaker documentation.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/dc-breaker-rating-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:12\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"pv dc fuse string sizing isc parallel strings series fuse rating\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201303<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>PV String Fuse Rating Calculator<\/h3>\n        <p class=\"card-description\">Calculate a reference gPV fuse-current range and compare it with the module maximum series-fuse rating.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>Isc \u00b7 strings \u00b7 factor \u00b7 max fuse<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>min A \u00b7 max A \u00b7 pass\/fail<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Standard route:<\/b> design multipliers selectable for the applicable standard.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/pv-string-fuse-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:13\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"pv combiner box strings current voltage fuse breaker isolator spd\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201304<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>PV Combiner Box Rating Calculator<\/h3>\n        <p class=\"card-description\">Aggregate string current and voltage into reference input-fuse, output-device, busbar, isolator, and SPD requirements.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>strings \u00b7 Isc \u00b7 cold Voc<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>fuse \u00b7 output A\/V \u00b7 SPD<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>System tool:<\/b> ratings remain subject to enclosure temperature.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/pv-combiner-box-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:14\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"dc isolator switch sizing pv voltage current utilization category poles\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201305<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>PV DC Isolator Rating Calculator<\/h3>\n        <p class=\"card-description\">Screen minimum voltage, current, utilization category, and pole configuration for a PV array isolation point.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>cold Voc \u00b7 Isc \u00b7 duty \u00b7 topology<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>Ue \u00b7 Ie \u00b7 poles \u00b7 category<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Product-specific:<\/b> verify the switching configuration at Vdc.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/pv-dc-isolator-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card priority-card\" style=\"--priority-rank:15\" data-priority-line=\"7\" data-category=\"solar\" data-search=\"pv spd ucpv minimum dc surge protector string voc temperature earthing\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013DC\u201306<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Solar &amp; DC<\/p><h3>PV SPD Minimum Ucpv Calculator<\/h3>\n        <p class=\"card-description\">Derive a minimum continuous operating voltage from the cold-condition array voltage, then screen SPD type and connection topology.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>cold Voc \u00b7 topology \u00b7 earthing<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>min Ucpv \u00b7 type \u00b7 connection<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Do not use nominal:<\/b> the max temperature-corrected Voc governs.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/pv-spd-ucpv-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"motor\" data-search=\"ac contactor motor current flc ac3 kw three phase\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013MC\u201301<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Motor &amp; switching<\/p><h3>AC Contactor Motor Sizing<\/h3>\n        <p class=\"card-description\">Estimate motor full-load current and a preliminary AC-3 operational-current requirement for normal starting and stopping duty.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>kW \u00b7 V \u00b7 phase \u00b7 \u03b7 \u00b7 PF<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>FLC \u00b7 minimum Ie<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Product stage:<\/b> coil, poles, auxiliaries, and life are selected after.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/ac-contactor-sizing-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"motor\" data-search=\"motor overload relay setting flc fla service factor trip class\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013MC\u201303<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Motor &amp; switching<\/p><h3>Motor Overload Relay Setting<\/h3>\n        <p class=\"card-description\">Translate motor nameplate current and application duty into a preliminary overload setting and trip-class check.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>nameplate A \u00b7 SF \u00b7 start \u00b7 ambient<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>setting \u00b7 band \u00b7 trip class<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Motor data governs:<\/b> use the nameplate current for final adjustment.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/motor-overload-relay-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"surge\" data-search=\"over under voltage threshold delay nominal tolerance protector\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013SV\u201302<\/span><span class=\"tool-kind conditional\">Conditional check<\/span><\/div>\n        <p class=\"category-name\">Surge &amp; voltage<\/p><h3>Voltage Threshold &amp; Delay Setting<\/h3>\n        <p class=\"card-description\">Build a preliminary voltage window, trip delay, and reconnection delay from the equipment tolerance and application behavior.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>Vn \u00b7 window \u00b7 application<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>U&lt;\/U&gt; \u00b7 delay range<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Application setting:<\/b> delay rides through disturbances, not calculated from load.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/voltage-protector-settings-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"distribution\" data-search=\"load current amps kw kva single three phase power converter\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013PD\u201302<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Power distribution<\/p><h3>Load Current &amp; Power Calculator<\/h3>\n        <p class=\"card-description\">Convert between kW, kVA, and current for DC, single-phase, and balanced three-phase loads.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>mode \u00b7 kW\/kVA\/A \u00b7 V \u00b7 PF<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>A \u00b7 kW \u00b7 kVA<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Supports:<\/b> preliminary sizing for breakers, ATS, contactors, CTs.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/load-current-power-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"distribution\" data-search=\"voltage drop cable wire conductor length copper aluminum\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013PD\u201303<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Power distribution<\/p><h3>Cable Voltage Drop Calculator<\/h3>\n        <p class=\"card-description\">Estimate conductor voltage drop and percentage loss for DC, single-phase, and three-phase circuits.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>A \u00b7 V \u00b7 length \u00b7 mm\u00b2 \u00b7 material<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>\u0394V \u00b7 Vd% \u00b7 end voltage<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Boundary:<\/b> resistance and reactance must match the conductor.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/cable-voltage-drop-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"distribution\" data-search=\"cable derating ampacity ambient grouping installation correction iz\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013PD\u201304<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Power distribution<\/p><h3>Cable Derating &amp; Iz Calculator<\/h3>\n        <p class=\"card-description\">Combine correction factors and check whether the corrected cable capacity remains above the selected breaker rating.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>base Iz \u00b7 Ca \u00b7 Cg \u00b7 Ci<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>corrected Iz \u00b7 In\u2264Iz<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Required:<\/b> base ampacity and factors from the adopted wiring tables.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/cable-derating-iz-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"distribution\" data-search=\"transformer primary secondary current kva voltage phase\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013PD\u201305<\/span><span class=\"tool-kind direct\">Direct calculation<\/span><\/div>\n        <p class=\"category-name\">Power distribution<\/p><h3>Transformer Current Calculator<\/h3>\n        <p class=\"card-description\">Calculate transformer line current on both sides from the kVA rating, voltage, and phase arrangement.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>kVA \u00b7 primary V \u00b7 sec V \u00b7 phase<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>primary A \u00b7 secondary A<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Supports:<\/b> preliminary CT, ATS, MCCB, and ACB planning.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/transformer-current-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"distribution\" data-search=\"current transformer ct ratio burden va lead meter 1a 5a\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013PM\u201301<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Power metering<\/p><h3>CT Ratio &amp; Burden Calculator<\/h3>\n        <p class=\"card-description\">Select a reference CT ratio and estimate total secondary burden from meters, relays, and connecting leads.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>primary A \u00b7 1\/5 A \u00b7 lead \u00b7 VA<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>ratio \u00b7 burden VA \u00b7 use<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Product check:<\/b> accuracy class and saturation need the exact CT data.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/ct-ratio-burden-calculator\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"protection\" data-search=\"rccb rcbo residual current leakage sensitivity type ac a f 30ma\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201304<\/span><span class=\"tool-kind conditional\">Conditional check<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>RCCB &amp; RCBO Parameter Check<\/h3>\n        <p class=\"card-description\">Organize residual-current waveform, protection purpose, load current, and expected standing leakage into a preliminary requirement.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>load \u00b7 waveform \u00b7 leakage \u00b7 poles<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>RCD type \u00b7 I\u0394n \u00b7 In check<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Code dependent:<\/b> sensitivity and selectivity follow the market rules.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/rccb-rcbo-selector\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n\n      <article class=\"tool-card\" data-category=\"protection\" data-search=\"acb air circuit breaker trip unit lsig ir isd ii ig frame selectivity\">\n        <div class=\"card-top\"><span class=\"tool-id\">JT\u2013CP\u201306<\/span><span class=\"tool-kind conditional\">Calculation + check<\/span><\/div>\n        <p class=\"category-name\">Circuit protection<\/p><h3>ACB Frame &amp; LSIG Worksheet<\/h3>\n        <p class=\"card-description\">Build preliminary frame-current and LSIG setting ranges from feeder load, conductor capacity, fault level, and coordination.<\/p>\n        <div class=\"io-row\"><div><small>Inputs<\/small><strong>Ib \u00b7 Iz \u00b7 Isc \u00b7 downstream<\/strong><\/div><span>\u2192<\/span><div><small>Outputs<\/small><strong>frame \u00b7 Ir \u00b7 Isd \u00b7 Ii \u00b7 Ig<\/strong><\/div><\/div>\n        <p class=\"logic-note\"><b>Coordination study:<\/b> final settings need manufacturer curves.<\/p>\n        <a class=\"card-action\" href=\"https:\/\/jutrion.com\/acb-lsig-setting-worksheet\/\">Open calculator <span>\u2192<\/span><\/a>\n      <\/article>\n    <\/div>\n    <div class=\"empty-state\" id=\"jtHubEmpty\" hidden><strong>No matching calculator yet.<\/strong><span>Try a broader term such as \u201ccurrent\u201d, \u201cbreaker\u201d, \u201cmotor\u201d, or \u201cvoltage\u201d.<\/span><\/div>\n  <\/section>\n\n  <section class=\"conversion-section\">\n    <div>\n      <p class=\"eyebrow\">After the calculation<\/p>\n      <h2>Have the parameters but still need a suitable product?<\/h2>\n      <p>Send the calculation summary to JUTRION when you need help checking an available configuration for the destination market.<\/p>\n    <\/div>\n    <div class=\"conversion-actions\">\n      <a class=\"jt-btn\" href=\"https:\/\/jutrion.com\/contact\/\">Get a free quote \u2192<\/a>\n      <a class=\"jt-btn ghost\" href=\"https:\/\/jutrion.com\/products\/\">Browse products<\/a>\n    <\/div>\n  <\/section>\n<\/div>\n\n<script>\n(function(){\n  var root=document.currentScript.previousElementSibling;\n  while(root&&!(root.classList&&root.classList.contains('jt-hub')))root=root.previousElementSibling;\n  if(!root)root=document.querySelector('.jt-hub');\n  if(!root)return;\n  var cards=[].slice.call(root.querySelectorAll('.tool-card'));\n  var tabs=[].slice.call(root.querySelectorAll('#jtHubTabs button'));\n  var search=root.querySelector('#jtHubSearch');\n  var empty=root.querySelector('#jtHubEmpty');\n  var active='all';\n  function filter(){\n    var q=(search.value||'').trim().toLowerCase();var vis=0;\n    cards.forEach(function(c){\n      var okCat=active==='all'||c.dataset.category===active;\n      var okQ=!q||((c.dataset.search+' '+c.textContent).toLowerCase().indexOf(q)>-1);\n      var show=okCat&&okQ;c.hidden=!show;if(show)vis++;\n    });\n    if(empty)empty.hidden=vis!==0;\n  }\n  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A connected set of engineering calculators for circuit protection, motor control, surge protection, voltage monitoring, and solar DC applications. 25parameter tools 6engineering categories IECfocused reference JUTRION parameter path Reference mode 01 \/ InputProject dataLoad \u00b7 source \u00b7 installation \u2192 02 \/ ProcessEngineering checkFormula + [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1778","page","type-page","status-publish","hentry"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/pages\/1778","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/comments?post=1778"}],"version-history":[{"count":7,"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/pages\/1778\/revisions"}],"predecessor-version":[{"id":1837,"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/pages\/1778\/revisions\/1837"}],"wp:attachment":[{"href":"https:\/\/jutrion.com\/ar\/wp-json\/wp\/v2\/media?parent=1778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}