{"id":31290,"date":"2026-09-24T09:57:15","date_gmt":"2026-09-24T01:57:15","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31290"},"modified":"2026-09-24T09:57:43","modified_gmt":"2026-09-24T01:57:43","slug":"ats-short-circuit-rating-guide-iq-icw-and-fuse-coordination","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/","title":{"rendered":"ATS Short-Circuit Rating Guide: Iq, Icw and Fuse Coordination"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31290\" class=\"elementor elementor-31290\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2ab0339 e-flex e-con-boxed e-con e-parent\" data-id=\"2ab0339\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5ae6c28 elementor-widget elementor-widget-html\" data-id=\"5ae6c28\" data-element_type=\"widget\" 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 }\r\n\r\n  .leeyee-ats-sc .sc-steps li {\r\n    padding-left: 45px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-steps li::before {\r\n    width: 30px;\r\n    height: 30px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table td,\r\n  .leeyee-ats-sc .sc-table tbody tr:nth-child(even) td {\r\n    padding: 11px 12px 11px 41%;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table td::before {\r\n    left: 12px;\r\n    top: 11px;\r\n    width: 34%;\r\n  }\r\n}\r\n\r\n@media (max-width: 360px) {\r\n  .leeyee-ats-sc {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-quick,\r\n  .leeyee-ats-sc .sc-note,\r\n  .leeyee-ats-sc .sc-warning,\r\n  .leeyee-ats-sc .sc-good,\r\n  .leeyee-ats-sc .sc-checklist,\r\n  .leeyee-ats-sc .sc-cta {\r\n    padding: 18px 15px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table td,\r\n  .leeyee-ats-sc .sc-table tbody tr:nth-child(even) td {\r\n    padding-top: 35px;\r\n    padding-left: 12px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table td::before {\r\n    width: auto;\r\n    right: 12px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<div class=\"leeyee-ats-sc\">\r\n\r\n  <p class=\"sc-intro\">\r\n    An <strong>ATS short-circuit rating<\/strong> cannot be judged from the switch ampere rating alone. This matters especially for compact automatic transfer switches used in distribution boards, generator backup systems and OEM panels: a 40 A or 63 A current marking tells you the normal operating-current range, not whether the ATS is suitable for the prospective fault current at the installation point.\r\n  <\/p>\r\n\r\n  <p class=\"sc-intro\">\r\n    For the LEEYEE compact Class PC ATS covered in this guide, the published product specification declares <strong>Iq = 5 kA<\/strong> and lists <strong>RT16-00-63A<\/strong> as the recommended fuse. The project engineer still has to compare the actual fault-current level and protection arrangement with the applicable product documentation before approval.\r\n  <\/p>\r\n\r\n  <div class=\"sc-quick\">\r\n    <span class=\"sc-quick-title\">Quick Answer<\/span>\r\n\r\n    <p>\r\n      LEEYEE's compact 2P \/ 4P ATS is specified as <strong>Class PC<\/strong>, with rated operational currents from <strong>6 A to 63 A<\/strong> and a declared <strong>Iq of 5 kA<\/strong>. Do not interpret \u201c5 kA\u201d as permission to install the ATS anywhere the calculated fault current is below 5 kA without further checking. Iq is a conditional short-circuit parameter, so the protection arrangement and the exact manufacturer documentation matter. <a class=\"sc-ref\" href=\"#ref-2\">[2]<\/a><a class=\"sc-ref\" href=\"#ref-3\">[3]<\/a>\r\n    <\/p>\r\n\r\n    <ul class=\"sc-four-checks\">\r\n      <li>Prospective short-circuit current at the ATS location<\/li>\r\n      <li>LEEYEE product declaration: Iq = 5 kA<\/li>\r\n      <li>Recommended fuse: RT16-00-63A<\/li>\r\n      <li>Actual upstream protection used in the panel<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <figure class=\"sc-figure sc-spec-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png\"\r\n      alt=\"LEEYEE 6A to 63A Class PC automatic transfer switch technical specifications including 2P 4P Iq 5kA and recommended fuse\"\r\n      width=\"1280\"\r\n      loading=\"eager\"\r\n      decoding=\"async\"\r\n      fetchpriority=\"high\">\r\n    <figcaption>\r\n      LEEYEE compact Class PC ATS technical specifications. The series covers 6\u201363 A, 2P \/ 4P configurations and declares Iq = 5 kA. The product specification lists RT16-00-63A as the recommended fuse.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"sc-note\">\r\n    <span class=\"sc-box-title\">Important for Short-Circuit Verification<\/span>\r\n    <p>\r\n      The current LEEYEE specification declares <strong>Iq = 5 kA<\/strong> but does not state an Icw value. This guide therefore does not invent or derive an Icw rating. If a project specifically requires Icw data, confirm the applicable model-specific technical or test documentation before approval.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <figure class=\"sc-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-short-circuit-system-coordination.webp\"\r\n      alt=\"ATS short-circuit coordination with upstream MCCB or fuse and prospective fault current\"\r\n      width=\"1448\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      The correct starting point is the prospective short-circuit current at the ATS installation point. The ATS declaration and the protective device that will clear the fault are then checked against the project conditions.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#what-does-the-5-ka-iq-rating-mean-for-this-leeyee-ats\" >What Does the 5 kA Iq Rating Mean for This LEEYEE ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#63-a-rated-current-and-5-ka-iq-answer-different-questions\" >63 A Rated Current and 5 kA Iq Answer Different Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#which-ats-short-circuit-parameters-should-a-panel-builder-look-for\" >Which ATS Short-Circuit Parameters Should a Panel Builder Look For?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#why-this-class-pc-ats-depends-on-the-protection-arrangement\" >Why This Class PC ATS Depends on the Protection Arrangement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#can-you-use-this-5-ka-ats-in-your-panel\" >Can You Use This 5 kA ATS in Your Panel?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#7-step-verification-process-for-the-leeyee-compact-ats\" >7-Step Verification Process for the LEEYEE Compact ATS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#what-if-the-consultant-asks-for-icw\" >What If the Consultant Asks for Icw?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#how-to-read-an-ats-datasheet-without-misreading-the-ka-value\" >How to Read an ATS Datasheet Without Misreading the kA Value<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#five-mistakes-to-avoid-with-a-6%e2%80%9363-a-class-pc-ats\" >Five Mistakes to Avoid With a 6\u201363 A Class PC ATS<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#iec-and-ul-documents-may-use-different-short-circuit-language\" >IEC and UL Documents May Use Different Short-Circuit Language<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#what-should-you-send-before-short-circuit-verification\" >What Should You Send Before Short-Circuit Verification?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-does-the-5-ka-iq-rating-mean-for-this-leeyee-ats\"><\/span>What Does the 5 kA Iq Rating Mean for This LEEYEE ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    In IEC terminology, <strong>Iq is the rated conditional short-circuit current<\/strong>. It describes a prospective short-circuit current associated with specified short-circuit protection conditions, rather than a universal standalone current that the transfer switch can interrupt by itself. <a class=\"sc-ref\" href=\"#ref-2\">[2]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    The LEEYEE product specification declares <strong>Iq = 5 kA<\/strong>. It also separately lists <strong>RT16-00-63A<\/strong> as the recommended fuse. These two published product facts are useful for panel design, but the available specification alone does not establish that every RT16-00-63A installation condition is automatically the tested conditional-rating combination.\r\n  <\/p>\r\n\r\n  <div class=\"sc-warning\">\r\n    <span class=\"sc-box-title\">Important Product Boundary<\/span>\r\n    <p>\r\n      Do not write \u201cLEEYEE ATS can withstand 5 kA by itself.\u201d The product data declares <strong>Iq = 5 kA<\/strong>. Because Iq is a conditional short-circuit parameter, project approval should also verify the applicable protective-device conditions and supporting product or test documentation.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"63-a-rated-current-and-5-ka-iq-answer-different-questions\"><\/span>63 A Rated Current and 5 kA Iq Answer Different Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The maximum <strong>63 A Ie<\/strong> value describes the normal operational-current range of this compact ATS series. The <strong>5 kA Iq<\/strong> value describes a short-circuit characteristic under its applicable conditions.\r\n  <\/p>\r\n\r\n  <div class=\"sc-table-wrap\">\r\n    <table class=\"sc-table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:24%\">Value<\/th>\r\n          <th style=\"width:38%\">What It Tells You<\/th>\r\n          <th style=\"width:38%\">What It Does Not Tell You<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Value\">Ie: up to 63 A<\/td>\r\n          <td data-label=\"Meaning\">Normal operating-current capability for the applicable model.<\/td>\r\n          <td data-label=\"Limit\">It does not define the fault current that can be accepted at the installation point.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Value\">Iq: 5 kA<\/td>\r\n          <td data-label=\"Meaning\">The product's declared conditional short-circuit current.<\/td>\r\n          <td data-label=\"Limit\">It is not a standalone circuit-breaker interrupting rating.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Value\">RT16-00-63A<\/td>\r\n          <td data-label=\"Meaning\">The fuse identified as recommended in the LEEYEE product specification.<\/td>\r\n          <td data-label=\"Limit\">The product sheet alone does not prove that any substitute MCCB or fuse has identical coordination performance.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Value\">AC-31B<\/td>\r\n          <td data-label=\"Meaning\">The utilization category stated for the product.<\/td>\r\n          <td data-label=\"Limit\">It is not the short-circuit rating and should not be used as a substitute for Iq or other short-circuit data.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n\r\n    <p class=\"sc-table-conclusion\">\r\n      <strong>Buyer meaning:<\/strong> \u201c63 A Class PC ATS, Iq 5 kA\u201d contains two different pieces of information. Both matter, but they answer different engineering questions.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-ats-short-circuit-parameters-should-a-panel-builder-look-for\"><\/span>Which ATS Short-Circuit Parameters Should a Panel Builder Look For?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    ATS datasheets may include Iq, Icw or other short-circuit information depending on the product and applicable documentation. These terms should not be merged into one generic \u201ckA rating.\u201d\r\n  <\/p>\r\n\r\n  <div class=\"sc-table-wrap\">\r\n    <table class=\"sc-table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:23%\">Parameter<\/th>\r\n          <th style=\"width:37%\">Engineering Meaning<\/th>\r\n          <th style=\"width:40%\">How It Applies Here<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Ie<\/td>\r\n          <td data-label=\"Meaning\">Rated operational current in normal service.<\/td>\r\n          <td data-label=\"LEEYEE\">LEEYEE compact ATS: 6\u201363 A depending on model.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Iq<\/td>\r\n          <td data-label=\"Meaning\">Rated conditional short-circuit current associated with specified short-circuit protection conditions.<\/td>\r\n          <td data-label=\"LEEYEE\">LEEYEE product specification: 5 kA.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Icw<\/td>\r\n          <td data-label=\"Meaning\">Rated short-time withstand current, normally read together with a declared duration.<\/td>\r\n          <td data-label=\"LEEYEE\">No Icw value is stated in the current product specification used for this guide. Do not assume one.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">Prospective short-circuit current<\/td>\r\n          <td data-label=\"Meaning\">The fault current potentially available at the actual ATS installation point.<\/td>\r\n          <td data-label=\"LEEYEE\">Must come from the project calculation or short-circuit study.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\">SCPD<\/td>\r\n          <td data-label=\"Meaning\">The short-circuit protective device intended to clear the fault.<\/td>\r\n          <td data-label=\"LEEYEE\">Product specification recommends RT16-00-63A fuse; different arrangements require verification.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <figure class=\"sc-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-icw-vs-iq-explained.webp\"\r\n      alt=\"Difference between ATS Icw and Iq short-circuit ratings for Class PC automatic transfer switches\"\r\n      width=\"1448\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Icw and Iq describe different short-circuit conditions. For this LEEYEE compact ATS, the current product specification declares Iq = 5 kA but does not state an Icw value.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-this-class-pc-ats-depends-on-the-protection-arrangement\"><\/span>Why This Class PC ATS Depends on the Protection Arrangement<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The LEEYEE compact ATS is specified as <strong>Class PC<\/strong>. In a Class PC application, the transfer switch should not be treated as the device that independently provides the complete short-circuit protection function for the circuit.\r\n  <\/p>\r\n\r\n  <p>\r\n    The practical engineering question is therefore:\r\n  <\/p>\r\n\r\n  <div class=\"sc-key-line\">\r\n    <strong>What is the prospective fault current at this ATS, which protective device will clear it, and does the complete arrangement remain within the ATS manufacturer's declared conditions?<\/strong>\r\n  <\/div>\r\n\r\n  <p>\r\n    Published IEC-oriented ATS data from major manufacturers illustrate this principle by stating conditional short-circuit ratings together with corresponding fuses or circuit breakers, while separately listing Icw where that parameter is declared. <a class=\"sc-ref\" href=\"#ref-2\">[2]<\/a><a class=\"sc-ref\" href=\"#ref-3\">[3]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    This is why replacing the recommended fuse with a different fuse or MCCB should not be treated as a paperwork-only change. If the protection arrangement differs from the documented configuration, verify the combination before project approval.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"can-you-use-this-5-ka-ats-in-your-panel\"><\/span>Can You Use This 5 kA ATS in Your Panel?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Start with the <strong>prospective short-circuit current at the ATS installation point<\/strong>. This value depends on the electrical system, source impedance, transformer characteristics, conductor impedance and installation location. It cannot be determined from the ATS product photo or 63 A current rating.\r\n  <\/p>\r\n\r\n  <h3>Situation 1: Project Fault Current and Protection Are Within Verified Product Conditions<\/h3>\r\n\r\n  <p>\r\n    If the project fault level, system voltage, ATS model and upstream protection are all covered by the applicable LEEYEE technical documentation, the configuration can move forward to normal project review.\r\n  <\/p>\r\n\r\n  <h3>Situation 2: The Project Uses a Different MCCB or Fuse<\/h3>\r\n\r\n  <p>\r\n    The product specification recommends RT16-00-63A. If the panel uses another fuse or an MCCB, do not assume that the same Iq performance automatically applies. Ask for confirmation of the specific combination.\r\n  <\/p>\r\n\r\n  <h3>Situation 3: Prospective Fault Current Is Above the Published 5 kA Iq<\/h3>\r\n\r\n  <p>\r\n    Do not approve this compact ATS by simply adding a larger upstream breaker or by borrowing a higher rating from another ATS model. The project requires a verified protection solution or another ATS configuration whose documented short-circuit capability covers the requirement.\r\n  <\/p>\r\n\r\n  <div class=\"sc-warning\">\r\n    <span class=\"sc-box-title\">Do Not Extrapolate<\/span>\r\n    <p>\r\n      A higher-current ATS from another product family, a competitor's Class PC test result, or a breaker interrupting rating cannot be used as evidence that this LEEYEE 6\u201363 A ATS has a higher short-circuit capability than the declared product data.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"7-step-verification-process-for-the-leeyee-compact-ats\"><\/span>7-Step Verification Process for the LEEYEE Compact ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"sc-steps\">\r\n    <li>\r\n      <strong>Calculate the prospective short-circuit current at the ATS location.<\/strong>\r\n      Use the project's electrical calculation or approved short-circuit study. Do not estimate it from the load current.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Confirm the exact ATS model and current.<\/strong>\r\n      The LEEYEE compact series covered here is available from 6 A to 63 A depending on the selected model.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Confirm voltage and poles.<\/strong>\r\n      Check the required AC110 V, AC220 V or AC400 V configuration and whether the project needs 2P or 4P.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Record the declared Iq value.<\/strong>\r\n      The current LEEYEE product specification states Iq = 5 kA.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Check the upstream protective device.<\/strong>\r\n      The product specification recommends RT16-00-63A fuse. If the project uses a different fuse or MCCB, request verification.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Check the scope of the supporting document.<\/strong>\r\n      Confirm that any short-circuit test report, certificate or coordination information applies to the exact model, voltage, pole configuration and protection arrangement.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Stop and confirm when the project is outside the published data.<\/strong>\r\n      Do not infer an Icw value or a higher Iq from another ATS series.\r\n    <\/li>\r\n  <\/ol>\r\n\r\n  <figure class=\"sc-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-short-circuit-verification-flow.webp\"\r\n      alt=\"ATS short-circuit rating verification flow for panel builders using Icw Iq and upstream protection\"\r\n      width=\"1448\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      For this compact Class PC ATS, the project workflow should begin with the actual fault-current level and use the declared Iq and applicable protection documentation rather than an assumed Icw value.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-if-the-consultant-asks-for-icw\"><\/span>What If the Consultant Asks for Icw?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Icw is an important short-circuit parameter on many Class PC transfer-switch datasheets. It represents a rated short-time withstand current and is normally stated together with a duration. ABB's IEC ATS data, for example, list Icw separately by time and list conditional Iq with corresponding protection data. <a class=\"sc-ref\" href=\"#ref-2\">[2]<\/a><a class=\"sc-ref\" href=\"#ref-3\">[3]<\/a>\r\n  <\/p>\r\n\r\n  <p>\r\n    However, the LEEYEE technical specification currently available for this compact ATS states <strong>Iq = 5 kA<\/strong> and does not state Icw.\r\n  <\/p>\r\n\r\n  <div class=\"sc-good\">\r\n    <span class=\"sc-box-title\">Correct Project Response<\/span>\r\n    <p>\r\n      If a consultant, panel standard or tender specification explicitly requires Icw, do not convert the 5 kA Iq into an Icw value. Request the required model-specific test or technical documentation before approving the ATS.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-read-an-ats-datasheet-without-misreading-the-ka-value\"><\/span>How to Read an ATS Datasheet Without Misreading the kA Value<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"sc-table-wrap\">\r\n    <table class=\"sc-table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:29%\">If You See<\/th>\r\n          <th style=\"width:33%\">Ask This Next<\/th>\r\n          <th style=\"width:38%\">Why It Matters<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Datasheet\">Iq = 5 kA<\/td>\r\n          <td data-label=\"Ask\">What protective-device conditions apply?<\/td>\r\n          <td data-label=\"Why\">Iq is conditional, not a standalone breaker interrupting rating.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Datasheet\">Recommended fuse: RT16-00-63A<\/td>\r\n          <td data-label=\"Ask\">Is this also the verified SCPD for the declared Iq condition?<\/td>\r\n          <td data-label=\"Why\">A recommended fuse entry and a formal short-circuit coordination declaration should not be assumed to be identical without supporting documentation.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Datasheet\">Icw<\/td>\r\n          <td data-label=\"Ask\">What current and duration are declared?<\/td>\r\n          <td data-label=\"Why\">Icw is read together with its time condition.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Datasheet\">63 A<\/td>\r\n          <td data-label=\"Ask\">Is this Ie or a short-circuit value?<\/td>\r\n          <td data-label=\"Why\">63 A is the rated operational current for the relevant model, not the fault-current rating.<\/td>\r\n        <\/tr>\r\n\r\n        <tr>\r\n          <td data-label=\"Datasheet\">AC-31B<\/td>\r\n          <td data-label=\"Ask\">What is the separate short-circuit declaration?<\/td>\r\n          <td data-label=\"Why\">Utilization category and short-circuit rating are different characteristics.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n\r\n    <p class=\"sc-table-conclusion\">\r\n      <strong>Procurement rule:<\/strong> never approve an ATS from a single kA number without identifying the parameter, protection condition and exact product scope.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <figure class=\"sc-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-datasheet-short-circuit-rating-check.webp\"\r\n      alt=\"How to read ATS datasheet short-circuit ratings including Icw Iq duration and SCPD\"\r\n      width=\"1448\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      A short-circuit value only becomes useful for project approval when the engineer knows what it represents and which protection and product conditions apply.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"five-mistakes-to-avoid-with-a-6%e2%80%9363-a-class-pc-ats\"><\/span>Five Mistakes to Avoid With a 6\u201363 A Class PC ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ul class=\"sc-mistakes\">\r\n    <li>\r\n      <strong>Mistake 1 \u2014 Treating 63 A as the short-circuit capability.<\/strong>\r\n      63 A is a rated operational-current option in this series. The published short-circuit parameter is Iq = 5 kA.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Mistake 2 \u2014 Calling Iq a standalone withstand rating.<\/strong>\r\n      Iq is a conditional short-circuit current and should be interpreted with its applicable protection conditions.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Mistake 3 \u2014 Inventing an Icw value because the project asks for one.<\/strong>\r\n      The available LEEYEE product specification does not state Icw. Request model-specific evidence instead.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Mistake 4 \u2014 Replacing the recommended fuse with any MCCB without verification.<\/strong>\r\n      A different protective device may change the applicable short-circuit coordination conditions.\r\n    <\/li>\r\n\r\n    <li>\r\n      <strong>Mistake 5 \u2014 Applying a large-frame ATS rating to this compact series.<\/strong>\r\n      Short-circuit declarations from 250 A, 400 A, 630 A or other ATS constructions cannot be transferred to this 6\u201363 A product.\r\n    <\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"iec-and-ul-documents-may-use-different-short-circuit-language\"><\/span>IEC and UL Documents May Use Different Short-Circuit Language<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Panel builders working on international projects may encounter IEC terms such as <strong>Iq<\/strong> and <strong>Icw<\/strong>, while UL-oriented transfer-switch documentation often discusses withstand-and-close ratings or WCR. These terms come from different standards and test frameworks and should not be treated as interchangeable labels.\r\n  <\/p>\r\n\r\n  <p>\r\n    Cummins transfer-switch engineering guidance illustrates the UL-oriented workflow of determining available fault current and then matching the transfer-switch rating and upstream overcurrent protection. The engineering principle is useful, but a UL WCR value should not be converted into an IEC Iq or Icw claim for a LEEYEE product without supporting documentation. <a class=\"sc-ref\" href=\"#ref-4\">[4]<\/a>\r\n  <\/p>\r\n\r\n  <div class=\"sc-note\">\r\n    <span class=\"sc-box-title\">Current IEC Reference<\/span>\r\n    <p>\r\n      IEC 60947-6-1:2026 is the current fourth edition of the transfer switching equipment standard. It was published in 2026 and replaced the 2021 edition. <a class=\"sc-ref\" href=\"#ref-1\">[1]<\/a>\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-you-send-before-short-circuit-verification\"><\/span>What Should You Send Before Short-Circuit Verification?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    \u201cI need a 63 A ATS\u201d is not enough information for a short-circuit review. A useful B2B enquiry should include the system data that determines whether the compact ATS and its protection arrangement are suitable.\r\n  <\/p>\r\n\r\n  <div class=\"sc-checklist\">\r\n    <span class=\"sc-quick-title\">Project Information Checklist<\/span>\r\n\r\n    <ul class=\"sc-check-grid\">\r\n      <li>Single-line diagram<\/li>\r\n      <li>System voltage and frequency<\/li>\r\n      <li>Normal-source information<\/li>\r\n      <li>Backup-source or generator information<\/li>\r\n      <li>Prospective short-circuit current at the ATS location<\/li>\r\n      <li>Required ATS current: 6\u201363 A<\/li>\r\n      <li>2P or 4P requirement<\/li>\r\n      <li>Planned upstream fuse or MCCB<\/li>\r\n      <li>Protective-device rating and type<\/li>\r\n      <li>Applicable project standard<\/li>\r\n      <li>Required short-circuit test or certificate scope<\/li>\r\n      <li>Quantity<\/li>\r\n      <li>OEM label requirement<\/li>\r\n      <li>OEM packaging requirement<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"sc-cta\">\r\n    <h3>Need to Check This ATS Against Your Panel Fault Level?<\/h3>\r\n\r\n    <p>\r\n      Send your single-line diagram, system voltage, prospective short-circuit current and planned upstream protection. LEEYEE can review which product data or project confirmation is required before quotation or sample approval.\r\n    <\/p>\r\n\r\n    <div class=\"sc-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Request ATS Short-Circuit Review\">\r\n        <span class=\"w-btn-label\">Request ATS Short-Circuit Review<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"sc-faq\">\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>What is the short-circuit rating of this LEEYEE compact ATS?<\/h3>\r\n      <p>\r\n        The available LEEYEE technical specification declares <strong>Iq = 5 kA<\/strong> for this compact Class PC ATS series. Because Iq is a conditional short-circuit parameter, the applicable protective-device conditions should also be verified before project approval.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Is this LEEYEE ATS Class PC?<\/h3>\r\n      <p>\r\n        Yes. The supplied LEEYEE product specification identifies this 2P \/ 4P compact ATS as <strong>Class PC<\/strong>.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Does the 63 A marking mean the ATS can withstand only 63 A during a short circuit?<\/h3>\r\n      <p>\r\n        No. The 63 A value is a rated operational-current option. The short-circuit parameter published for this series is Iq = 5 kA. These ratings describe different operating conditions.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Does this ATS have an Icw rating?<\/h3>\r\n      <p>\r\n        An Icw value is not stated in the LEEYEE technical specification currently available for this article. It should therefore not be invented or derived from the 5 kA Iq value. If a project requires Icw, request the applicable model-specific documentation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Which fuse is recommended for this ATS?<\/h3>\r\n      <p>\r\n        The supplied LEEYEE product specification lists <strong>RT16-00-63A<\/strong> as the recommended fuse. For project short-circuit approval, confirm whether the exact fuse and installation conditions correspond to the supporting coordination or test documentation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Can I use an MCCB instead of the recommended fuse?<\/h3>\r\n      <p>\r\n        Do not assume equivalent short-circuit performance automatically. If the actual panel uses an MCCB or another fuse, the protective-device combination should be verified against the applicable LEEYEE technical or test documentation.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Can I use this ATS where the prospective short-circuit current is higher than 5 kA?<\/h3>\r\n      <p>\r\n        The published product data should not be extended beyond its declared short-circuit capability without verified engineering evidence. If the project fault level exceeds the documented rating, request another verified protection arrangement or a different ATS solution rather than assuming suitability.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>Is AC-31B the short-circuit rating?<\/h3>\r\n      <p>\r\n        No. AC-31B is the utilization category stated for the product. It is separate from the declared Iq short-circuit parameter.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"sc-faq-item\">\r\n      <h3>What information should I send LEEYEE for short-circuit verification?<\/h3>\r\n      <p>\r\n        Send the system voltage, ATS current and pole configuration, prospective short-circuit current at the installation point, planned upstream fuse or MCCB, single-line diagram and any project requirement for Iq, Icw, certificates or test reports.\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <div class=\"sc-cta\">\r\n    <h3>Confirm the Protection Arrangement Before Final ATS Approval<\/h3>\r\n\r\n    <p>\r\n      For an OEM panel or project order, share the actual fault-current level and upstream protection together with the ATS requirement. LEEYEE can confirm which model-specific technical documents are available and what still needs project verification.\r\n    <\/p>\r\n\r\n    <div class=\"sc-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Share Your ATS Project Requirements\">\r\n        <span class=\"w-btn-label\">Share Your ATS Project Requirements<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"sc-references\">\r\n\r\n    <li id=\"ref-1\">\r\n      International Electrotechnical Commission (IEC).\r\n      <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment.<\/em>\r\n      Edition 4.0.\r\n      <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-2\">\r\n      ABB.\r\n      <em>Automatic Transfer Switches \u2014 Technical Performance and Selection Considerations.<\/em>\r\n      Technical discussion of Class PC transfer switching equipment, rated conditional short-circuit current Iq, rated short-time withstand current Icw and protective-device considerations.\r\n      <a href=\"https:\/\/library.e.abb.com\/public\/a0a6a4a06b204e7bbf5988e6d35ee364\/ATS%20white%20paper_1SCC303022C0201_20-09.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB ATS technical white paper<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-3\">\r\n      ABB.\r\n      <em>TruONE Automatic Transfer Switches \u2014 IEC Technical Data.<\/em>\r\n      Published Class PC product data showing conditional short-circuit current and short-time withstand information under stated conditions.\r\n      <a href=\"https:\/\/library.e.abb.com\/public\/8cb23daa8bae4592a0fccd4832374c26\/TruONE%20ATS_Main%20catalog_1SCC303008C0201_2024.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB TruONE ATS catalogue<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-4\">\r\n      Cummins Power Generation.\r\n      <em>Applying Transfer Switch High WCR \/ Short-Time Rating to Simplify Electrical System Design.<\/em>\r\n      Engineering guidance covering available fault current, transfer-switch short-circuit ratings and upstream overcurrent protection in UL-oriented systems.\r\n      <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2021-06\/PowerHour_Applying-Transfer-Switch-High-WCR-Short-Time-Rating-To-Simplify-Electrical-System-Design.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Cummins technical paper<\/a>.\r\n    <\/li>\r\n\r\n    <li id=\"ref-5\">\r\n      LEEYEE.\r\n      <em>Compact Automatic Transfer Switch Technical Specifications.<\/em>\r\n      Product data supplied for the 6\u201363 A, 2P \/ 4P Class PC ATS series, including AC110 \/ AC220 \/ AC400 V rated working voltage, Iq 5 kA, RT16-00-63A recommended fuse and AC-31B utilization category. Project-specific certificate and test-report scope should be confirmed before approval.\r\n    <\/li>\r\n\r\n  <\/ol>\r\n\r\n  <script>\r\n  document.addEventListener('DOMContentLoaded', function () {\r\n    var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n    aboutPopupButtons.forEach(function (button) {\r\n      button.addEventListener('click', function () {\r\n        var realPopupTrigger = document.querySelector(\r\n          '.w-popup.ush_popup_1 .w-popup-trigger'\r\n        );\r\n\r\n        if (realPopupTrigger) {\r\n          realPopupTrigger.click();\r\n        } else {\r\n          window.open(\r\n            'https:\/\/www.cnspd.com\/contact\/',\r\n            '_blank',\r\n            'noopener'\r\n          );\r\n        }\r\n      });\r\n    });\r\n  });\r\n  <\/script>\r\n\r\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>An ATS short-circuit rating cannot be judged from the switch ampere rating alone. This matters especially for compact automatic transfer switches used in distribution boards, generator backup systems and OEM panels: a 40 A or 63 A current marking tells you the normal operating-current range, not whether the ATS is suitable for the prospective fault&#8230;<\/p>","protected":false},"author":18,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[490,1,422],"tags":[],"class_list":["post-31290","post","type-post","status-publish","format-standard","hentry","category-isolator-switching","category-news","category-industry-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ATS Short-Circuit Rating Guide: Iq, Icw &amp; Fuse Coordination<\/title>\n<meta name=\"description\" content=\"Learn how to verify ATS short-circuit ratings for Class PC transfer switches, including Iq, Icw, prospective fault current and fuse or MCCB coordination, with LEEYEE 6\u201363A ATS technical data.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS Short-Circuit Rating Guide: Iq, Icw &amp; Fuse Coordination\" \/>\n<meta property=\"og:description\" content=\"Learn how to verify ATS short-circuit ratings for Class PC transfer switches, including Iq, Icw, prospective fault current and fuse or MCCB coordination, with LEEYEE 6\u201363A ATS technical data.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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