{"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":"%e3%83%84%e3%83%bc%e3%83%ab","status":"publish","type":"page","link":"https:\/\/jutrion.com\/ja\/tools\/","title":{"rendered":"\u30c4\u30fc\u30eb"},"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 + conditional logic \u2192 03 \/ OutputRequired parametersCurrent \u00b7 rating \u00b7 limits Direct calculationNumeric resultFormula-derived Conditional checkSelection rangeRequires verification Guided workflow The JUTRION calculation chain Move from source and load data to protection parameters through smaller checks that can be reviewed independently. 01ACalculate load currentPower, voltage and phase \u2192 Ib\u2192 02InEstimate breaker ratingIb, margin and cable [&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\/ja\/wp-json\/wp\/v2\/pages\/1778","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/comments?post=1778"}],"version-history":[{"count":7,"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/pages\/1778\/revisions"}],"predecessor-version":[{"id":1837,"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/pages\/1778\/revisions\/1837"}],"wp:attachment":[{"href":"https:\/\/jutrion.com\/ja\/wp-json\/wp\/v2\/media?parent=1778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}