{"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":"Guide ATS sur les intensit\u00e9s de court-circuit admissibles : Iq, Icw et coordination des fusibles"},"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\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n.leeyee-ats-sc,\r\n.leeyee-ats-sc * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.leeyee-ats-sc {\r\n  --brand: #004898;\r\n  --brand-dark: #00386f;\r\n  --brand-pale: #eef5ff;\r\n  --brand-pale-2: #f7fbff;\r\n  --text: #26333d;\r\n  --heading: #17232c;\r\n  --muted: #5f6f7c;\r\n  --line: #dce6ee;\r\n  --warning: #9a5a00;\r\n  --warning-bg: #fff8ec;\r\n  --good: #17643b;\r\n  --good-bg: #f3faf6;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 10px 20px 52px;\r\n  background: #fff;\r\n  color: var(--text);\r\n  font-size: 16.5px;\r\n  line-height: 1.72;\r\n  overflow-wrap: break-word;\r\n}\r\n\r\n.leeyee-ats-sc p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n.leeyee-ats-sc strong {\r\n  color: var(--heading);\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-ats-sc a {\r\n  color: var(--brand);\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n.leeyee-ats-sc a:hover {\r\n  color: var(--brand-dark);\r\n}\r\n\r\n.leeyee-ats-sc h2 {\r\n  margin: 52px 0 18px;\r\n  color: var(--heading);\r\n  font-size: clamp(27px, 3.1vw, 33px);\r\n  line-height: 1.22;\r\n  letter-spacing: -0.018em;\r\n}\r\n\r\n.leeyee-ats-sc h3 {\r\n  margin: 34px 0 13px;\r\n  color: var(--heading);\r\n  font-size: clamp(21px, 2.4vw, 24px);\r\n  line-height: 1.3;\r\n}\r\n\r\n.leeyee-ats-sc .sc-intro {\r\n  margin: 0 0 20px;\r\n  color: #334653;\r\n  font-size: 18px;\r\n  line-height: 1.68;\r\n}\r\n\r\n.leeyee-ats-sc .sc-intro strong {\r\n  color: var(--brand);\r\n}\r\n\r\n.leeyee-ats-sc .sc-quick {\r\n  margin: 26px 0 30px;\r\n  padding: 24px 26px;\r\n  border: 1px solid #bdd3e8;\r\n  border-left: 5px solid var(--brand);\r\n  border-radius: 10px;\r\n  background: var(--brand-pale-2);\r\n}\r\n\r\n.leeyee-ats-sc .sc-quick-title,\r\n.leeyee-ats-sc .sc-box-title {\r\n  display: block;\r\n  margin-bottom: 9px;\r\n  color: var(--brand);\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n  line-height: 1.35;\r\n  letter-spacing: .055em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n.leeyee-ats-sc .sc-quick p:last-child,\r\n.leeyee-ats-sc .sc-note p:last-child,\r\n.leeyee-ats-sc .sc-warning p:last-child,\r\n.leeyee-ats-sc .sc-good p:last-child,\r\n.leeyee-ats-sc .sc-cta p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-four-checks {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 10px 18px;\r\n  margin: 18px 0 4px;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.leeyee-ats-sc .sc-four-checks li {\r\n  position: relative;\r\n  padding-left: 27px;\r\n  color: #243845;\r\n  font-weight: 650;\r\n}\r\n\r\n.leeyee-ats-sc .sc-four-checks li::before {\r\n  content: \"\u2713\";\r\n  position: absolute;\r\n  left: 0;\r\n  top: 0;\r\n  color: var(--brand);\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-ats-sc .sc-figure {\r\n  margin: 30px 0 38px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  margin: 0;\r\n  border: 1px solid #dce5ec;\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  box-shadow: 0 5px 20px rgba(20, 56, 83, .07);\r\n}\r\n\r\n.leeyee-ats-sc .sc-figure figcaption {\r\n  margin-top: 10px;\r\n  color: var(--muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n.leeyee-ats-sc .sc-spec-figure {\r\n  margin-top: 26px;\r\n  margin-bottom: 28px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-spec-figure img {\r\n  border: 0;\r\n  border-radius: 12px;\r\n  box-shadow: 0 6px 24px rgba(20, 56, 83, .08);\r\n}\r\n\r\n.leeyee-ats-sc .sc-spec-figure figcaption {\r\n  max-width: 780px;\r\n  margin: 11px auto 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table-wrap {\r\n  margin: 22px 0 31px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table-note {\r\n  margin-bottom: 10px;\r\n  color: var(--muted);\r\n  font-size: 14.5px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table {\r\n  width: 100%;\r\n  border-collapse: separate;\r\n  border-spacing: 0;\r\n  table-layout: fixed;\r\n  overflow: hidden;\r\n  border: 1px solid var(--line);\r\n  border-radius: 9px;\r\n  background: #fff;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table th,\r\n.leeyee-ats-sc .sc-table td {\r\n  padding: 14px 15px;\r\n  border-right: 1px solid var(--line);\r\n  border-bottom: 1px solid var(--line);\r\n  vertical-align: top;\r\n  text-align: left;\r\n  line-height: 1.48;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table th:last-child,\r\n.leeyee-ats-sc .sc-table td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table thead th {\r\n  background: var(--brand);\r\n  color: #fff;\r\n  font-size: 14px;\r\n  font-weight: 750;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table tbody tr:nth-child(even) td {\r\n  background: #f9fbfd;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table td:first-child {\r\n  color: var(--heading);\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-ats-sc .sc-table-conclusion {\r\n  margin: 12px 0 0;\r\n  color: #324956;\r\n  font-size: 15px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-note,\r\n.leeyee-ats-sc .sc-warning,\r\n.leeyee-ats-sc .sc-good {\r\n  margin: 24px 0 30px;\r\n  padding: 20px 22px;\r\n  border-radius: 9px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-note {\r\n  border: 1px solid #bfd5e9;\r\n  background: var(--brand-pale);\r\n}\r\n\r\n.leeyee-ats-sc .sc-warning {\r\n  border: 1px solid #ebcf9d;\r\n  border-left: 4px solid #d88713;\r\n  background: var(--warning-bg);\r\n}\r\n\r\n.leeyee-ats-sc .sc-warning .sc-box-title {\r\n  color: var(--warning);\r\n}\r\n\r\n.leeyee-ats-sc .sc-good {\r\n  border: 1px solid #bddbc9;\r\n  border-left: 4px solid var(--good);\r\n  background: var(--good-bg);\r\n}\r\n\r\n.leeyee-ats-sc .sc-good .sc-box-title {\r\n  color: var(--good);\r\n}\r\n\r\n.leeyee-ats-sc .sc-key-line {\r\n  margin: 24px 0;\r\n  padding: 17px 20px;\r\n  border-left: 4px solid var(--brand);\r\n  background: #fafcfe;\r\n  color: #233946;\r\n  font-size: 17px;\r\n  font-weight: 650;\r\n}\r\n\r\n.leeyee-ats-sc .sc-steps {\r\n  margin: 20px 0 30px;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: sc-step;\r\n}\r\n\r\n.leeyee-ats-sc .sc-steps li {\r\n  position: relative;\r\n  margin: 0 0 19px;\r\n  padding: 0 0 19px 52px;\r\n  border-bottom: 1px solid #edf1f4;\r\n  counter-increment: sc-step;\r\n}\r\n\r\n.leeyee-ats-sc .sc-steps li:last-child {\r\n  padding-bottom: 0;\r\n  border-bottom: 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-steps li::before {\r\n  content: counter(sc-step);\r\n  position: absolute;\r\n  top: 0;\r\n  left: 0;\r\n  display: grid;\r\n  width: 34px;\r\n  height: 34px;\r\n  place-items: center;\r\n  border-radius: 50%;\r\n  background: var(--brand);\r\n  color: #fff;\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-ats-sc .sc-steps strong {\r\n  display: block;\r\n  margin-bottom: 4px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-mistakes {\r\n  margin: 21px 0 30px;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.leeyee-ats-sc .sc-mistakes li {\r\n  margin: 0 0 18px;\r\n  padding: 0 0 18px;\r\n  border-bottom: 1px solid #edf1f4;\r\n}\r\n\r\n.leeyee-ats-sc .sc-mistakes li:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-mistakes strong {\r\n  display: block;\r\n  margin-bottom: 4px;\r\n  color: #733d00;\r\n}\r\n\r\n.leeyee-ats-sc .sc-checklist {\r\n  margin: 28px 0 25px;\r\n  padding: 24px 25px;\r\n  border: 1px solid #bfd4e8;\r\n  border-radius: 10px;\r\n  background: var(--brand-pale-2);\r\n}\r\n\r\n.leeyee-ats-sc .sc-check-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 9px 22px;\r\n  margin: 15px 0 0;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.leeyee-ats-sc .sc-check-grid li {\r\n  position: relative;\r\n  padding-left: 25px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-check-grid li::before {\r\n  content: \"\u25a1\";\r\n  position: absolute;\r\n  left: 0;\r\n  top: -1px;\r\n  color: var(--brand);\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-ats-sc .sc-cta {\r\n  margin: 27px 0 45px;\r\n  padding: 26px;\r\n  border: 1px solid #bdd3e7;\r\n  border-radius: 11px;\r\n  background: #fff;\r\n  box-shadow: 0 7px 25px rgba(18, 62, 93, .07);\r\n}\r\n\r\n.leeyee-ats-sc .sc-cta h3 {\r\n  margin: 0 0 10px;\r\n  font-size: 23px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-cta-actions {\r\n  margin-top: 18px;\r\n}\r\n\r\n.leeyee-ats-sc .leeyee-about-btn-light {\r\n  -webkit-appearance: none;\r\n  appearance: none;\r\n  display: inline-flex;\r\n  min-height: 50px;\r\n  align-items: center;\r\n  justify-content: center;\r\n  padding: 12px 24px;\r\n  border: 2px solid #004898;\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: #004898;\r\n  font-family: inherit;\r\n  font-size: 15.5px;\r\n  font-weight: 700;\r\n  line-height: 1.25;\r\n  text-align: center;\r\n  text-decoration: none;\r\n  cursor: pointer;\r\n  box-shadow: 0 4px 13px rgba(0, 72, 152, .12);\r\n  transition:\r\n    background-color .18s ease,\r\n    color .18s ease,\r\n    border-color .18s ease,\r\n    transform .18s ease,\r\n    box-shadow .18s ease;\r\n}\r\n\r\n.leeyee-ats-sc .leeyee-about-btn-light:hover {\r\n  border-color: #004898;\r\n  background: #004898;\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 7px 18px rgba(0, 72, 152, .2);\r\n}\r\n\r\n.leeyee-ats-sc .leeyee-about-btn-light:focus {\r\n  outline: none;\r\n}\r\n\r\n.leeyee-ats-sc .leeyee-about-btn-light:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, .28);\r\n  outline-offset: 3px;\r\n  border-color: #004898;\r\n  background: #004898;\r\n  color: #fff;\r\n}\r\n\r\n.leeyee-ats-sc .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n.leeyee-ats-sc .sc-ref {\r\n  font-size: .79em;\r\n  font-weight: 700;\r\n  vertical-align: super;\r\n  text-decoration: none;\r\n}\r\n\r\n.leeyee-ats-sc .sc-faq {\r\n  margin-top: 19px;\r\n  border-top: 1px solid var(--line);\r\n}\r\n\r\n.leeyee-ats-sc .sc-faq-item {\r\n  padding: 20px 0;\r\n  border-bottom: 1px solid var(--line);\r\n}\r\n\r\n.leeyee-ats-sc .sc-faq-item h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 20px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-faq-item p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-ats-sc .sc-references {\r\n  margin: 18px 0 0;\r\n  padding-left: 22px;\r\n  color: #4b5c68;\r\n  font-size: 14.5px;\r\n  line-height: 1.62;\r\n}\r\n\r\n.leeyee-ats-sc .sc-references li {\r\n  margin: 0 0 12px;\r\n  padding-left: 3px;\r\n}\r\n\r\n.leeyee-ats-sc .sc-references a {\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n@media (max-width: 1024px) {\r\n  .leeyee-ats-sc {\r\n    max-width: 840px;\r\n  }\r\n}\r\n\r\n@media (max-width: 820px) {\r\n  .leeyee-ats-sc {\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n\r\n  .leeyee-ats-sc h2 {\r\n    margin-top: 44px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  .leeyee-ats-sc {\r\n    padding: 6px 16px 42px;\r\n    font-size: 16px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-intro {\r\n    font-size: 17px;\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: 20px 18px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-four-checks,\r\n  .leeyee-ats-sc .sc-check-grid {\r\n    grid-template-columns: 1fr;\r\n    gap: 8px;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table {\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table thead {\r\n    position: absolute;\r\n    width: 1px;\r\n    height: 1px;\r\n    overflow: hidden;\r\n    clip: rect(0 0 0 0);\r\n    white-space: nowrap;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table tbody,\r\n  .leeyee-ats-sc .sc-table tr,\r\n  .leeyee-ats-sc .sc-table td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table tr {\r\n    margin-bottom: 14px;\r\n    overflow: hidden;\r\n    border: 1px solid var(--line);\r\n    border-radius: 9px;\r\n    background: #fff;\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    position: relative;\r\n    min-height: 47px;\r\n    padding: 12px 13px 12px 43%;\r\n    border: 0;\r\n    border-bottom: 1px solid var(--line);\r\n    background: #fff;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-ats-sc .sc-table td::before {\r\n    content: attr(data-label);\r\n    position: absolute;\r\n    left: 13px;\r\n    top: 12px;\r\n    width: 37%;\r\n    color: var(--brand);\r\n    font-size: 13px;\r\n    font-weight: 750;\r\n    line-height: 1.35;\r\n  }\r\n\r\n  .leeyee-ats-sc .leeyee-about-btn-light {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  .leeyee-ats-sc {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  .leeyee-ats-sc h2 {\r\n    margin-top: 40px;\r\n  }\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_89 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 v28.8 - 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 - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-24T01:57:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-24T01:57:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"13 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"ATS Short-Circuit Rating Guide: Iq, Icw and Fuse Coordination\",\"datePublished\":\"2026-09-24T01:57:15+00:00\",\"dateModified\":\"2026-09-24T01:57:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/\"},\"wordCount\":2626,\"image\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1.5-1.png\",\"articleSection\":[\"Isolator &amp; Switching\",\"News\",\"Technical Guides\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/\",\"name\":\"ATS Short-Circuit Rating Guide: Iq, Icw & Fuse Coordination\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1.5-1.png\",\"datePublished\":\"2026-09-24T01:57:15+00:00\",\"dateModified\":\"2026-09-24T01:57:43+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"description\":\"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.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1.5-1.png\",\"contentUrl\":\"https:\\\/\\\/www.cnspd.com\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/1.5-1.png\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/ats-short-circuit-rating-guide\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.cnspd.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"ATS Short-Circuit Rating Guide: Iq, Icw and Fuse Coordination\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#website\",\"url\":\"https:\\\/\\\/www.cnspd.com\\\/\",\"name\":\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\",\"description\":\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.cnspd.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\",\"name\":\"Devin Ling\",\"sameAs\":[\"https:\\\/\\\/cnspd.com\\\/\"],\"url\":\"https:\\\/\\\/www.cnspd.com\\\/fr\\\/author\\\/devin\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Guide ATS sur les intensit\u00e9s de court-circuit admissibles : Iq, Icw et coordination des fusibles","description":"D\u00e9couvrez comment v\u00e9rifier les caract\u00e9ristiques de court-circuit des ATS (commutateurs automatiques de transfert) pour les commutateurs de transfert de classe PC, notamment les courants Iq, Icw, le courant de d\u00e9faut pr\u00e9visionnel et la coordination des fusibles ou des disjoncteurs miniatures (MCCB), gr\u00e2ce aux donn\u00e9es techniques des ATS LEEYEE 6\u201363 A.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/","og_locale":"fr_FR","og_type":"article","og_title":"ATS Short-Circuit Rating Guide: Iq, Icw & Fuse Coordination","og_description":"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.","og_url":"https:\/\/www.cnspd.com\/fr\/ats-short-circuit-rating-guide\/","og_site_name":"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE","article_published_time":"2026-09-24T01:57:15+00:00","article_modified_time":"2026-09-24T01:57:43+00:00","og_image":[{"url":"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png","type":"","width":"","height":""}],"author":"Devin Ling","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"Devin Ling","Dur\u00e9e de lecture estim\u00e9e":"13 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#article","isPartOf":{"@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/"},"author":{"name":"Devin Ling","@id":"https:\/\/www.cnspd.com\/#\/schema\/person\/f49dbafe62c5b47100ad2d9f88af92d3"},"headline":"ATS Short-Circuit Rating Guide: Iq, Icw and Fuse Coordination","datePublished":"2026-09-24T01:57:15+00:00","dateModified":"2026-09-24T01:57:43+00:00","mainEntityOfPage":{"@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/"},"wordCount":2626,"image":{"@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#primaryimage"},"thumbnailUrl":"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png","articleSection":["Isolator &amp; Switching","News","Technical Guides"],"inLanguage":"fr-FR"},{"@type":"WebPage","@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/","url":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/","name":"Guide ATS sur les intensit\u00e9s de court-circuit admissibles : Iq, Icw et coordination des fusibles","isPartOf":{"@id":"https:\/\/www.cnspd.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#primaryimage"},"image":{"@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#primaryimage"},"thumbnailUrl":"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png","datePublished":"2026-09-24T01:57:15+00:00","dateModified":"2026-09-24T01:57:43+00:00","author":{"@id":"https:\/\/www.cnspd.com\/#\/schema\/person\/f49dbafe62c5b47100ad2d9f88af92d3"},"description":"D\u00e9couvrez comment v\u00e9rifier les caract\u00e9ristiques de court-circuit des ATS (commutateurs automatiques de transfert) pour les commutateurs de transfert de classe PC, notamment les courants Iq, Icw, le courant de d\u00e9faut pr\u00e9visionnel et la coordination des fusibles ou des disjoncteurs miniatures (MCCB), gr\u00e2ce aux donn\u00e9es techniques des ATS LEEYEE 6\u201363 A.","breadcrumb":{"@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#primaryimage","url":"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png","contentUrl":"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/1.5-1.png"},{"@type":"BreadcrumbList","@id":"https:\/\/www.cnspd.com\/ats-short-circuit-rating-guide\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.cnspd.com\/"},{"@type":"ListItem","position":2,"name":"ATS Short-Circuit Rating Guide: Iq, Icw and Fuse Coordination"}]},{"@type":"WebSite","@id":"https:\/\/www.cnspd.com\/#website","url":"https:\/\/www.cnspd.com\/","name":"Protecteur de surtension, parafoudre, interrupteur de s\u00e9paration - LEEYEEEE","description":"Protecteur de surtension, parafoudre, interrupteur de s\u00e9paration - LEEYEEEE","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.cnspd.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Person","@id":"https:\/\/www.cnspd.com\/#\/schema\/person\/f49dbafe62c5b47100ad2d9f88af92d3","name":"Devin Ling","sameAs":["https:\/\/cnspd.com\/"],"url":"https:\/\/www.cnspd.com\/fr\/author\/devin\/"}]}},"_links":{"self":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts\/31290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/comments?post=31290"}],"version-history":[{"count":4,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts\/31290\/revisions"}],"predecessor-version":[{"id":31296,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/posts\/31290\/revisions\/31296"}],"wp:attachment":[{"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/media?parent=31290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/categories?post=31290"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cnspd.com\/fr\/wp-json\/wp\/v2\/tags?post=31290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}