{"id":31252,"date":"2026-09-22T09:57:42","date_gmt":"2026-09-22T01:57:42","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31252"},"modified":"2026-09-22T09:58:16","modified_gmt":"2026-09-22T01:58:16","slug":"ats-with-mccb-how-to-protect-a-compact-ats-in-distribution-panels","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/ats-with-mccb-selection-guide\/","title":{"rendered":"ATS with MCCB: How to Protect a Compact ATS in Distribution Panels"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31252\" class=\"elementor elementor-31252\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4b8d545 e-flex e-con-boxed e-con e-parent\" data-id=\"4b8d545\" 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-0a4ecc5 elementor-widget elementor-widget-html\" data-id=\"0a4ecc5\" 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-mccb-guide,\r\n#leeyee-ats-mccb-guide * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-ats-mccb-guide {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00376f;\r\n  --ly-blue-soft: #eef5ff;\r\n  --ly-blue-softer: #f7fbff;\r\n  --ly-text: #25313d;\r\n  --ly-muted: #5d6b78;\r\n  --ly-line: #dbe4ec;\r\n  --ly-warning-bg: #fff8ec;\r\n  --ly-warning-line: #d98916;\r\n  --ly-success-bg: #f2f8f5;\r\n  --ly-success-line: #2f7d57;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 56px;\r\n  color: var(--ly-text);\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n#leeyee-ats-mccb-guide p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide a {\r\n  color: var(--ly-blue);\r\n  text-decoration: underline;\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide a:hover {\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n#leeyee-ats-mccb-guide h2,\r\n#leeyee-ats-mccb-guide h3 {\r\n  color: #17212b;\r\n  font-weight: 750;\r\n  letter-spacing: -0.018em;\r\n  scroll-margin-top: 90px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide h2 {\r\n  margin: 54px 0 18px;\r\n  font-size: clamp(28px, 3.6vw, 34px);\r\n  line-height: 1.22;\r\n}\r\n\r\n#leeyee-ats-mccb-guide h3 {\r\n  margin: 34px 0 12px;\r\n  font-size: clamp(21px, 2.7vw, 25px);\r\n  line-height: 1.3;\r\n}\r\n\r\n#leeyee-ats-mccb-guide ul,\r\n#leeyee-ats-mccb-guide ol {\r\n  margin: 10px 0 22px;\r\n  padding-left: 24px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide li {\r\n  margin: 7px 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide strong {\r\n  color: #192531;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-intro {\r\n  margin: 4px 0 26px;\r\n  font-size: 18px;\r\n  line-height: 1.68;\r\n  color: #334250;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-kicker {\r\n  display: inline-block;\r\n  margin-bottom: 9px;\r\n  color: var(--ly-blue);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n  letter-spacing: .08em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-quick,\r\n#leeyee-ats-mccb-guide .leeyee-callout,\r\n#leeyee-ats-mccb-guide .leeyee-warning,\r\n#leeyee-ats-mccb-guide .leeyee-checklist,\r\n#leeyee-ats-mccb-guide .leeyee-cta,\r\n#leeyee-ats-mccb-guide .leeyee-scenario,\r\n#leeyee-ats-mccb-guide .leeyee-scope {\r\n  border-radius: 12px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-quick {\r\n  margin: 28px 0 26px;\r\n  padding: 26px 28px;\r\n  background: var(--ly-blue-softer);\r\n  border: 1px solid #cfe0f3;\r\n  border-left: 4px solid var(--ly-blue);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-quick h2 {\r\n  margin: 0 0 13px;\r\n  font-size: clamp(26px, 3.3vw, 31px);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scope {\r\n  margin: 0 0 34px;\r\n  padding: 20px 22px;\r\n  border: 1px solid #d9e4ef;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scope strong:first-child {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-quick p:last-child,\r\n#leeyee-ats-mccb-guide .leeyee-callout p:last-child,\r\n#leeyee-ats-mccb-guide .leeyee-warning p:last-child,\r\n#leeyee-ats-mccb-guide .leeyee-cta p:last-child,\r\n#leeyee-ats-mccb-guide .leeyee-scenario p:last-child,\r\n#leeyee-ats-mccb-guide .leeyee-scope p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-callout {\r\n  margin: 24px 0;\r\n  padding: 20px 22px;\r\n  background: var(--ly-blue-soft);\r\n  border-left: 4px solid var(--ly-blue);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-callout-title {\r\n  display: block;\r\n  margin-bottom: 6px;\r\n  color: var(--ly-blue-dark);\r\n  font-weight: 800;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-warning {\r\n  margin: 26px 0;\r\n  padding: 20px 22px;\r\n  background: var(--ly-warning-bg);\r\n  border-left: 4px solid var(--ly-warning-line);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-warning .leeyee-callout-title {\r\n  color: #7a4b08;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-engineering-note {\r\n  margin: 24px 0;\r\n  padding: 18px 20px;\r\n  background: #fafcfe;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 10px;\r\n  color: #465563;\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table-wrap {\r\n  margin: 22px 0 28px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table-note {\r\n  margin: 0 0 10px;\r\n  color: var(--ly-muted);\r\n  font-size: 14.5px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table {\r\n  width: 100%;\r\n  border-collapse: separate;\r\n  border-spacing: 0;\r\n  table-layout: fixed;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 10px;\r\n  overflow: hidden;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table th,\r\n#leeyee-ats-mccb-guide .leeyee-table td {\r\n  padding: 14px 15px;\r\n  vertical-align: top;\r\n  text-align: left;\r\n  border-right: 1px solid var(--ly-line);\r\n  border-bottom: 1px solid var(--ly-line);\r\n  font-size: 15.5px;\r\n  line-height: 1.5;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table th {\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table th:last-child,\r\n#leeyee-ats-mccb-guide .leeyee-table td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table tbody tr:nth-child(even) td {\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-table-conclusion {\r\n  margin: 10px 0 0;\r\n  color: #334657;\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-figure {\r\n  margin: 30px 0 34px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  aspect-ratio: 4 \/ 3;\r\n  object-fit: contain;\r\n  border: 1px solid #dfe7ef;\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  box-shadow: 0 8px 24px rgba(15, 48, 77, .07);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-figure figcaption {\r\n  margin-top: 10px;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-step-list {\r\n  margin: 24px 0;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: ly-step;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-step-list li {\r\n  position: relative;\r\n  margin: 0 0 15px;\r\n  padding: 0 0 0 48px;\r\n  counter-increment: ly-step;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-step-list li::before {\r\n  content: counter(ly-step);\r\n  position: absolute;\r\n  left: 0;\r\n  top: 1px;\r\n  width: 31px;\r\n  height: 31px;\r\n  display: grid;\r\n  place-items: center;\r\n  border-radius: 50%;\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  font-size: 14px;\r\n  font-weight: 800;\r\n  line-height: 1;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scenario {\r\n  margin: 28px 0;\r\n  padding: 24px 26px;\r\n  background: #fff;\r\n  border: 1px solid #d8e2ec;\r\n  box-shadow: 0 7px 22px rgba(27, 56, 80, .055);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scenario h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scenario-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(3, minmax(0, 1fr));\r\n  gap: 12px;\r\n  margin: 20px 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scenario-item {\r\n  padding: 16px;\r\n  border-radius: 9px;\r\n  background: var(--ly-blue-softer);\r\n  border: 1px solid #dbe8f6;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-scenario-item strong {\r\n  display: block;\r\n  margin-bottom: 5px;\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-checklist {\r\n  margin: 28px 0;\r\n  padding: 24px 26px;\r\n  background: var(--ly-success-bg);\r\n  border: 1px solid #d3e8dc;\r\n  border-left: 4px solid var(--ly-success-line);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-checklist h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-check-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 8px 26px;\r\n  margin: 14px 0 0;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-check-grid li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding: 8px 0 8px 26px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-check-grid li::before {\r\n  content: \"\u2713\";\r\n  position: absolute;\r\n  left: 0;\r\n  top: 7px;\r\n  color: var(--ly-success-line);\r\n  font-weight: 900;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-cta {\r\n  margin: 28px 0 34px;\r\n  padding: 24px 26px;\r\n  background: var(--ly-blue-softer);\r\n  border: 1px solid #cfdef0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-cta h3 {\r\n  margin: 0 0 9px;\r\n  color: #17212b;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-cta-actions {\r\n  margin-top: 18px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-about-btn-light {\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  min-height: 50px;\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  max-width: 100%;\r\n  padding: 12px 24px;\r\n  border: 1.5px solid var(--ly-blue);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: var(--ly-blue);\r\n  box-shadow: 0 5px 16px rgba(0, 72, 152, .10);\r\n  font: inherit;\r\n  font-size: 16px;\r\n  font-weight: 750;\r\n  line-height: 1.25;\r\n  text-align: center;\r\n  cursor: pointer;\r\n  transition: background-color .18s ease, color .18s ease, transform .18s ease, box-shadow .18s ease;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-about-btn-light:hover {\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 8px 20px rgba(0, 72, 152, .16);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-about-btn-light:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, .28);\r\n  outline-offset: 3px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq {\r\n  margin: 18px 0 34px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq details {\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq details:last-child {\r\n  border-bottom: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq summary {\r\n  position: relative;\r\n  padding: 17px 38px 17px 0;\r\n  color: #1b2a36;\r\n  font-weight: 750;\r\n  line-height: 1.45;\r\n  cursor: pointer;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq summary::after {\r\n  content: \"+\";\r\n  position: absolute;\r\n  right: 4px;\r\n  top: 50%;\r\n  transform: translateY(-50%);\r\n  color: var(--ly-blue);\r\n  font-size: 24px;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq details[open] summary::after {\r\n  content: \"\u2212\";\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-faq-answer {\r\n  padding: 0 28px 17px 0;\r\n  color: #43515e;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-ref {\r\n  white-space: nowrap;\r\n  font-size: .78em;\r\n  font-weight: 750;\r\n  vertical-align: super;\r\n  text-decoration: none;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-references {\r\n  margin-top: 48px;\r\n  padding-top: 28px;\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-references h2 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-ats-mccb-guide .leeyee-references li {\r\n  margin-bottom: 14px;\r\n  color: #4e5d69;\r\n  font-size: 14.5px;\r\n  line-height: 1.55;\r\n}\r\n\r\n@media (max-width: 820px) {\r\n  #leeyee-ats-mccb-guide .leeyee-scenario-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  #leeyee-ats-mccb-guide {\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n    font-size: 16.5px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide h2 {\r\n    margin-top: 46px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  #leeyee-ats-mccb-guide {\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-check-grid {\r\n    grid-template-columns: 1fr;\r\n    gap: 2px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-table {\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-table thead {\r\n    position: absolute;\r\n    width: 1px;\r\n    height: 1px;\r\n    margin: -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-mccb-guide .leeyee-table,\r\n  #leeyee-ats-mccb-guide .leeyee-table tbody,\r\n  #leeyee-ats-mccb-guide .leeyee-table tr,\r\n  #leeyee-ats-mccb-guide .leeyee-table td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-table tr {\r\n    margin-bottom: 14px;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n    overflow: hidden;\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-table td,\r\n  #leeyee-ats-mccb-guide .leeyee-table tbody tr:nth-child(even) td {\r\n    display: grid;\r\n    grid-template-columns: minmax(105px, .85fr) minmax(0, 1.35fr);\r\n    gap: 12px;\r\n    padding: 12px 13px;\r\n    border-right: 0;\r\n    border-bottom: 1px solid var(--ly-line);\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-table td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-table td::before {\r\n    content: attr(data-label);\r\n    color: var(--ly-blue-dark);\r\n    font-size: 13.5px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-about-btn-light {\r\n    width: 100%;\r\n  }\r\n}\r\n\r\n@media (max-width: 480px) {\r\n  #leeyee-ats-mccb-guide {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n    font-size: 16px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide .leeyee-quick,\r\n  #leeyee-ats-mccb-guide .leeyee-callout,\r\n  #leeyee-ats-mccb-guide .leeyee-warning,\r\n  #leeyee-ats-mccb-guide .leeyee-checklist,\r\n  #leeyee-ats-mccb-guide .leeyee-cta,\r\n  #leeyee-ats-mccb-guide .leeyee-scenario,\r\n  #leeyee-ats-mccb-guide .leeyee-scope {\r\n    padding: 19px;\r\n  }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n  #leeyee-ats-mccb-guide .leeyee-table td {\r\n    grid-template-columns: 1fr;\r\n    gap: 4px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide h2 {\r\n    font-size: 27px;\r\n  }\r\n\r\n  #leeyee-ats-mccb-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<div id=\"leeyee-ats-mccb-guide\">\r\n\r\n  <p class=\"leeyee-intro\">When a compact automatic transfer switch is installed in a distribution panel, one of the most important questions is not simply which ATS current rating to choose. The panel designer also needs to decide how the ATS is protected, whether MCCBs belong on the source side, load side or both, and how the complete protection architecture should be coordinated.<\/p>\r\n\r\n  <section class=\"leeyee-quick\" aria-labelledby=\"quick-answer\">\r\n    <span class=\"leeyee-kicker\">Quick Answer<\/span>\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\/de\/ats-with-mccb-selection-guide\/#does-a-compact-ats-need-an-mccb\" >Does a Compact ATS Need an MCCB?<\/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\/de\/ats-with-mccb-selection-guide\/#ats-and-mccb-have-different-responsibilities\" >ATS and MCCB Have Different Responsibilities<\/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\/de\/ats-with-mccb-selection-guide\/#should-the-mccb-be-before-or-after-the-ats\" >Should the MCCB Be Before or After the ATS?<\/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\/de\/ats-with-mccb-selection-guide\/#why-this-guide-mentions-pc-class-and-cb-class\" >Why This Guide Mentions PC Class and CB Class<\/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\/de\/ats-with-mccb-selection-guide\/#do-not-select-the-mccb-by-ats-ampere-rating-alone\" >Do Not Select the MCCB by ATS Ampere Rating Alone<\/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\/de\/ats-with-mccb-selection-guide\/#ats-mccb-selection-and-coordination-flow\" >ATS + MCCB Selection and Coordination Flow<\/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\/de\/ats-with-mccb-selection-guide\/#example-compact-ats-between-utility-and-generator-sources\" >Example: Compact ATS Between Utility and Generator Sources<\/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\/de\/ats-with-mccb-selection-guide\/#normal-source-and-generator-protection-may-be-different\" >Normal Source and Generator Protection May Be Different<\/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\/de\/ats-with-mccb-selection-guide\/#what-changes-when-the-ats-is-installed-inside-a-distribution-panel\" >What Changes When the ATS Is Installed Inside a Distribution Panel?<\/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\/de\/ats-with-mccb-selection-guide\/#protection-is-not-the-same-as-maintenance-isolation\" >Protection Is Not the Same as Maintenance Isolation<\/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\/de\/ats-with-mccb-selection-guide\/#ats-mccb-bom-what-should-be-confirmed\" >ATS + MCCB BOM: What Should Be Confirmed?<\/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\/de\/ats-with-mccb-selection-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\/de\/ats-with-mccb-selection-guide\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"quick-answer\"><span class=\"ez-toc-section\" id=\"does-a-compact-ats-need-an-mccb\"><\/span>Does a Compact ATS Need an MCCB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p><strong>Do not treat a compact ATS as a substitute for the required short-circuit and overload protection of the distribution circuit.<\/strong> The ATS transfers the load between the normal and emergency sources. Circuit breakers or other suitable protective devices perform the required fault-protection functions according to the system design.<\/p>\r\n\r\n    <p>An MCCB can therefore be installed <strong>before the ATS, after the ATS, or on both sides<\/strong>. Each position has a different protection responsibility. The correct arrangement depends on the selected ATS model, its declared short-circuit data, the available fault current, the source protection, downstream feeder protection and the approved single-line diagram.<\/p>\r\n\r\n    <p><strong>Buyer meaning:<\/strong> for a compact LEEYEE ATS application, first confirm what must be protected and what fault current is available. Do not select an MCCB only because its ampere rating matches the ATS.<\/p>\r\n\r\n    <div class=\"leeyee-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Ask for ATS and MCCB configuration review\">\r\n        <span class=\"w-btn-label\">Ask for ATS + MCCB Configuration Review<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"leeyee-scope\">\r\n    <strong>Product scope of this guide<\/strong>\r\n    <p>This article is written around the <strong>compact integrated ATS architecture supplied by LEEYEE<\/strong>, where the transfer mechanism, operating controls and source-status functions are integrated into one compact device for installation in a distribution panel.<\/p>\r\n    <p>Breaker-based Class CB transfer systems are mentioned only to explain why some ATS diagrams use circuit breakers as the switching devices. They should not be interpreted as the standard physical appearance or supply architecture of the compact LEEYEE ATS shown in this application.<\/p>\r\n    <p>The exact IEC class, Iq, Icw and permitted protective-device combinations must be confirmed from the technical documents for the selected ATS model. They should not be inferred from product appearance alone.<\/p>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-and-mccb-have-different-responsibilities\"><\/span>ATS and MCCB Have Different Responsibilities<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The formal IEC term is <strong>transfer switching equipment (TSE)<\/strong>; an automatically operated version is ATSE. IEC 60947-6-1:2026 applies to transfer switching equipment, while IEC 60947-2:2024 applies to circuit-breakers within its scope. <a class=\"leeyee-ref\" href=\"#ref-1\">[1]<\/a><a class=\"leeyee-ref\" href=\"#ref-2\">[2]<\/a><\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Device \/ Function<\/th>\r\n          <th>Main Job<\/th>\r\n          <th>What the Panel Designer Must Confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Device \/ Function\"><strong>Compact ATS<\/strong><\/td>\r\n          <td data-label=\"Main Job\">Transfers the load between two power sources.<\/td>\r\n          <td data-label=\"Designer Must Confirm\">Rated current, voltage, poles, operating mode, control functions and declared short-circuit performance.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Device \/ Function\"><strong>MCCB \/ SCPD<\/strong><\/td>\r\n          <td data-label=\"Main Job\">Provides fault interruption and circuit protection within its declared ratings.<\/td>\r\n          <td data-label=\"Designer Must Confirm\">Rated current, Icu\/Ics, trip characteristics, system voltage and coordination with the ATS.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Device \/ Function\"><strong>Protection coordination<\/strong><\/td>\r\n          <td data-label=\"Main Job\">Determines how the protection system behaves during a fault.<\/td>\r\n          <td data-label=\"Designer Must Confirm\">Fault level, clearing behaviour, selectivity requirements and manufacturer coordination data.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n\r\n    <p class=\"leeyee-table-conclusion\"><strong>Procurement conclusion:<\/strong> the ATS selects the power source; the protection system determines how a fault is safely interrupted.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-the-mccb-be-before-or-after-the-ats\"><\/span>Should the MCCB Be Before or After the ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>There is no universal rule that an MCCB must always be installed before or always after a compact ATS. The breaker position depends on the protection zone it is intended to serve.<\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img fetchpriority=\"high\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-mccb-before-after-placement.webp\"\r\n         width=\"1448\"\r\n         height=\"1086\"\r\n         alt=\"Typical MCCB placement before and after a compact ATS in a distribution panel\"\r\n         loading=\"eager\"\r\n         decoding=\"async\"\r\n         fetchpriority=\"high\">\r\n    <figcaption><strong>Figure 1.<\/strong> Conceptual MCCB positions around a compact ATS. The illustration explains protection responsibilities; it is not a project-specific wiring instruction.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <h3>1. MCCB on Each Source Before the ATS<\/h3>\r\n\r\n  <p>A common distribution-panel architecture places one protective device on the normal source and another on the emergency source before the ATS.<\/p>\r\n\r\n  <p>This allows each source circuit to be protected and isolated according to its own electrical conditions. It is especially important when the ATS short-circuit performance is declared in combination with a specified short-circuit protective device.<\/p>\r\n\r\n  <p>ABB technical guidance explains that rated conditional short-circuit current, <strong>Iq<\/strong>, applies to transfer switching equipment protected by a specified SCPD under the declared conditions. <a class=\"leeyee-ref\" href=\"#ref-3\">[3]<\/a><\/p>\r\n\r\n  <p><strong>Buyer meaning:<\/strong> the source-side protective device should be selected from system data and ATS coordination information, not only from ATS rated current.<\/p>\r\n\r\n  <h3>2. MCCB After the ATS<\/h3>\r\n\r\n  <p>An MCCB installed after the ATS usually protects the outgoing feeder, cable or downstream load circuit.<\/p>\r\n\r\n  <div class=\"leeyee-callout\">\r\n    <span class=\"leeyee-callout-title\">Important distinction<\/span>\r\n    <p><strong>A load-side MCCB does not automatically replace the protection required on the incoming source side.<\/strong> The two locations protect different parts of the system.<\/p>\r\n  <\/div>\r\n\r\n  <h3>3. Source-Side MCCBs Plus a Load-Side MCCB<\/h3>\r\n\r\n  <p>A distribution panel may use protection on both incoming sources and another breaker after the ATS. This creates separate protection zones for the source feeders and outgoing feeder.<\/p>\r\n\r\n  <p>However, more breakers do not automatically mean better protection. Their breaking capacity and trip behaviour still have to be coordinated. Where selectivity is required, the protective device closest to the fault should operate without unnecessarily disconnecting healthy upstream sections of the system. <a class=\"leeyee-ref\" href=\"#ref-5\">[5]<\/a><\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\"><strong>Project confirmation:<\/strong> the three arrangements above are conceptual. Final breaker positions must follow the approved SLD, source protection, conductor protection, available fault current, ATS technical data and maintenance requirements.<\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-this-guide-mentions-pc-class-and-cb-class\"><\/span>Why This Guide Mentions PC Class and CB Class<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>PC Class and CB Class are useful because they explain why different ATS systems show different circuit-breaker arrangements. They should not be confused with the physical appearance of the compact LEEYEE ATS used as the main product context for this page.<\/p>\r\n\r\n  <p>ABB guidance describes <strong>Class PC<\/strong> transfer switching equipment as capable of making and withstanding its declared short-circuit duty but not intended to interrupt the short-circuit current. <strong>Class CB<\/strong> equipment uses circuit breakers as part of the transfer switching architecture and can provide short-circuit interruption within the declared breaker performance. <a class=\"leeyee-ref\" href=\"#ref-3\">[3]<\/a><\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/pc-class-vs-cb-class-ats-protection.webp\"\r\n         width=\"1448\"\r\n         height=\"1086\"\r\n         alt=\"PC Class and CB Class ATS comparison showing different fault protection responsibilities\"\r\n         loading=\"lazy\"\r\n         decoding=\"async\">\r\n    <figcaption><strong>Figure 2.<\/strong> PC Class versus CB Class is shown only to explain protection architecture. The breaker-based Class CB diagram is not intended to represent the standard LEEYEE compact ATS product appearance.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <span class=\"leeyee-callout-title\">Do not infer ATS class from appearance alone<\/span>\r\n    <p>The exact IEC class and short-circuit ratings of a LEEYEE ATS model must come from its datasheet, test documentation or certificate scope. Product appearance by itself is not sufficient evidence for assigning Iq, Icw or an IEC classification.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-not-select-the-mccb-by-ats-ampere-rating-alone\"><\/span>Do Not Select the MCCB by ATS Ampere Rating Alone<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>If a compact ATS is rated at a certain current, it may seem logical to choose an MCCB with the same current rating. That is only the beginning of the selection process.<\/p>\r\n\r\n  <p>The designer must also verify the prospective short-circuit current, circuit-breaker breaking capacity, trip characteristics and the ATS short-circuit performance. <a class=\"leeyee-ref\" href=\"#ref-2\">[2]<\/a><a class=\"leeyee-ref\" href=\"#ref-3\">[3]<\/a><\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <span class=\"leeyee-callout-title\">Common specification mistake<\/span>\r\n    <p><strong>ATS rated current = MCCB rated current<\/strong> does not prove that the two devices form a safe short-circuit coordination.<\/p>\r\n  <\/div>\r\n\r\n  <h3>Four Parameters Worth Checking<\/h3>\r\n\r\n  <ul>\r\n    <li><strong>ATS rated current:<\/strong> confirms the continuous current range under the stated operating conditions.<\/li>\r\n    <li><strong>Iq:<\/strong> where assigned, indicates conditional short-circuit performance with a specified protective device. <a class=\"leeyee-ref\" href=\"#ref-3\">[3]<\/a><\/li>\r\n    <li><strong>Icw:<\/strong> where assigned, indicates the declared short-time withstand capability of the transfer equipment. <a class=\"leeyee-ref\" href=\"#ref-3\">[3]<\/a><\/li>\r\n    <li><strong>MCCB Icu \/ Ics:<\/strong> indicate circuit-breaker short-circuit breaking performance under IEC 60947-2. <a class=\"leeyee-ref\" href=\"#ref-2\">[2]<\/a><\/li>\r\n  <\/ul>\r\n\r\n  <p><strong>Buyer meaning:<\/strong> if a quotation lists only ATS current and MCCB current, ask what short-circuit and coordination information supports the proposed combination.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-mccb-selection-and-coordination-flow\"><\/span>ATS + MCCB Selection and Coordination Flow<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <ol class=\"leeyee-step-list\">\r\n    <li><strong>Confirm the load current.<\/strong> Determine the continuous load and operating conditions.<\/li>\r\n    <li><strong>Select the compact ATS configuration.<\/strong> Confirm voltage, rated current, poles, operating mode and model-specific technical data.<\/li>\r\n    <li><strong>Confirm the available fault current.<\/strong> Use the project short-circuit calculation or approved engineering data at the installation point.<\/li>\r\n    <li><strong>Select the protective device.<\/strong> Check rated current, operating voltage, Icu\/Ics and trip characteristics.<\/li>\r\n    <li><strong>Check the ATS short-circuit data.<\/strong> Where the ATS rating depends on a specified SCPD, verify the exact protective-device combination.<\/li>\r\n    <li><strong>Check upstream and downstream coordination.<\/strong> Verify selectivity where required by the project.<\/li>\r\n    <li><strong>Approve the final SLD and BOM.<\/strong> Confirm source protection, downstream protection, isolation, controls and panel requirements.<\/li>\r\n  <\/ol>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\" src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-mccb-selection-coordination-flow.webp\"\r\n         width=\"1448\"\r\n         height=\"1086\"\r\n         alt=\"Compact ATS and MCCB selection flow for short-circuit protection coordination\"\r\n         loading=\"lazy\"\r\n         decoding=\"async\">\r\n    <figcaption><strong>Figure 3.<\/strong> A practical workflow for coordinating a compact ATS with external protective devices in a distribution panel.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-callout\">\r\n    <span class=\"leeyee-callout-title\">Engineering meaning<\/span>\r\n    <p><strong>Rated current determines operating size. Fault current determines whether the protection architecture can safely withstand and clear a short circuit.<\/strong><\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"example-compact-ats-between-utility-and-generator-sources\"><\/span>Example: Compact ATS Between Utility and Generator Sources<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <section class=\"leeyee-scenario\">\r\n    <h3>How a Panel Builder Should Approach the Protection Scheme<\/h3>\r\n\r\n    <p>Consider a compact ATS installed between a utility source and an emergency generator. The ATS handles source transfer, while the panel designer still needs to define how each source feeder and the downstream load are protected.<\/p>\r\n\r\n    <div class=\"leeyee-scenario-grid\">\r\n      <div class=\"leeyee-scenario-item\">\r\n        <strong>Utility source<\/strong>\r\n        Check the upstream feeder protection, prospective short-circuit current and coordination requirements.\r\n      <\/div>\r\n\r\n      <div class=\"leeyee-scenario-item\">\r\n        <strong>Compact ATS<\/strong>\r\n        Confirm rated current, poles, source voltage and the model-specific short-circuit declaration.\r\n      <\/div>\r\n\r\n      <div class=\"leeyee-scenario-item\">\r\n        <strong>Generator source<\/strong>\r\n        Check generator current, available fault contribution and generator-side protection independently.\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <p>If the outgoing feeder needs separate protection, a load-side MCCB may also be included. That downstream breaker does not automatically replace the protection required for either incoming source.<\/p>\r\n\r\n    <p><strong>Do not:<\/strong> duplicate the utility MCCB specification on the generator side simply because the ATS current is the same.<\/p>\r\n\r\n    <p><strong>Do:<\/strong> verify each source independently, then check the ATS and protective-device coordination before approving the BOM.<\/p>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"normal-source-and-generator-protection-may-be-different\"><\/span>Normal Source and Generator Protection May Be Different<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The two ATS sources can have very different fault characteristics. A utility supply backed by a transformer and an emergency generator should not automatically be treated as equivalent short-circuit sources.<\/p>\r\n\r\n  <p>The generator-side protective device should therefore be checked using the actual generator and project data instead of mechanically copying the normal-source breaker.<\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\"><strong>Project confirmation:<\/strong> if generator fault data, available short-circuit current or upstream protection information is not yet available, keep the protective-device selection open for engineering confirmation instead of assigning unsupported ratings.<\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-changes-when-the-ats-is-installed-inside-a-distribution-panel\"><\/span>What Changes When the ATS Is Installed Inside a Distribution Panel?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Component compliance and complete-assembly verification are different levels of engineering work. IEC 60947-6-1 applies to transfer switching equipment and IEC 60947-2 applies to circuit-breakers. When those devices are integrated into a low-voltage power switchgear and controlgear assembly, the applicable IEC 61439 requirements may also need to be addressed for the complete panel. <a class=\"leeyee-ref\" href=\"#ref-6\">[6]<\/a><a class=\"leeyee-ref\" href=\"#ref-7\">[7]<\/a><\/p>\r\n\r\n  <div class=\"leeyee-callout\">\r\n    <span class=\"leeyee-callout-title\">Important for panel builders<\/span>\r\n    <p><strong>Using compliant individual ATS and MCCB components does not by itself complete the verification of the whole switchboard.<\/strong> The assembly design may also need to address short-circuit withstand, temperature rise, conductors, busbars, protective-device integration and other requirements under the applicable assembly standard.<\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"protection-is-not-the-same-as-maintenance-isolation\"><\/span>Protection Is Not the Same as Maintenance Isolation<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>An MCCB can be part of a maintenance-isolation strategy, but fault protection and safe isolation are not automatically the same function.<\/p>\r\n\r\n  <p>The project should separately confirm how the compact ATS can be isolated for inspection or replacement and whether additional disconnecting or bypass arrangements are required.<\/p>\r\n\r\n  <p>IEC 60947-6-1:2026 also includes requirements for bypass\/isolation transfer switching equipment in Annex C. <a class=\"leeyee-ref\" href=\"#ref-1\">[1]<\/a><\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-mccb-bom-what-should-be-confirmed\"><\/span>ATS + MCCB BOM: What Should Be Confirmed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>BOM Item<\/th>\r\n          <th>Function<\/th>\r\n          <th>What to Confirm<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"BOM Item\"><strong>Compact ATS<\/strong><\/td>\r\n          <td data-label=\"Function\">Source transfer<\/td>\r\n          <td data-label=\"What to Confirm\">Model, poles, current, voltage, control mode and declared short-circuit data.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"BOM Item\"><strong>Normal-source MCCB \/ SCPD<\/strong><\/td>\r\n          <td data-label=\"Function\">Normal-source feeder protection<\/td>\r\n          <td data-label=\"What to Confirm\">Current, Icu\/Ics, trip characteristics and ATS coordination.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"BOM Item\"><strong>Emergency-source MCCB \/ SCPD<\/strong><\/td>\r\n          <td data-label=\"Function\">Generator or emergency feeder protection<\/td>\r\n          <td data-label=\"What to Confirm\">Generator\/source data, fault current and trip characteristics.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"BOM Item\"><strong>Load-side MCCB<\/strong><\/td>\r\n          <td data-label=\"Function\">Outgoing feeder protection where required<\/td>\r\n          <td data-label=\"What to Confirm\">Cable\/load current, fault level and downstream coordination.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"BOM Item\"><strong>Control \/ auxiliary signals<\/strong><\/td>\r\n          <td data-label=\"Function\">ATS control, status and interface functions<\/td>\r\n          <td data-label=\"What to Confirm\">Auto\/manual functions, source status, alarm contacts and BMS\/PLC needs.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"BOM Item\"><strong>Panel assembly<\/strong><\/td>\r\n          <td data-label=\"Function\">Integrates protection, switching and conductors<\/td>\r\n          <td data-label=\"What to Confirm\">Busbar, wiring, thermal design, short-circuit verification and applicable IEC 61439 requirements.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-checklist\">\r\n    <h3>Before Ordering: Send These ATS + MCCB Details<\/h3>\r\n\r\n    <ul class=\"leeyee-check-grid\">\r\n      <li>Single-line diagram<\/li>\r\n      <li>Normal-source voltage and frequency<\/li>\r\n      <li>Emergency-source voltage and frequency<\/li>\r\n      <li>Rated load current<\/li>\r\n      <li>Required ATS poles<\/li>\r\n      <li>Neutral switching requirement<\/li>\r\n      <li>Prospective short-circuit current, if known<\/li>\r\n      <li>Normal-source breaker information<\/li>\r\n      <li>Generator rating and protection information<\/li>\r\n      <li>MCCB breaking-capacity requirement, if specified<\/li>\r\n      <li>Trip settings, if already engineered<\/li>\r\n      <li>Control voltage<\/li>\r\n      <li>Auto\/manual control requirement<\/li>\r\n      <li>Auxiliary contacts \/ BMS \/ PLC signals<\/li>\r\n      <li>Applicable project standard<\/li>\r\n      <li>Panel or OEM requirement<\/li>\r\n      <li>Required quantity<\/li>\r\n      <li>Maintenance\/isolation requirement<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <section class=\"leeyee-cta\">\r\n    <h3>Need to Confirm the MCCB Arrangement for a Compact ATS?<\/h3>\r\n\r\n    <p>Send LEEYEE your single-line diagram, source information, load current and existing protection requirements. We can review the compact ATS configuration and identify which protection details still need project confirmation.<\/p>\r\n\r\n    <p>Final protection approval should follow the project fault-current study, applicable standards and the model-specific ATS and protective-device data.<\/p>\r\n\r\n    <div class=\"leeyee-cta-actions\">\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Send your compact ATS panel requirement\">\r\n        <span class=\"w-btn-label\">Send Your ATS Panel Requirement<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/section>\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=\"leeyee-faq\">\r\n\r\n    <details>\r\n      <summary>Does a compact ATS replace an MCCB?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>No. A compact ATS performs the transfer function. The required overcurrent and short-circuit protection must still be provided by the protection architecture of the distribution system. The exact protective device depends on the selected ATS model and project design.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Should the MCCB be before or after the ATS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>Either position can be used for a valid engineering reason. Source-side MCCBs protect incoming circuits and may be required for ATS short-circuit coordination. A load-side MCCB protects the outgoing feeder. Some panels use both.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can I choose the MCCB just by matching the ATS current?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>No. Rated current alone does not confirm short-circuit coordination. Check available fault current, breaker Icu\/Ics, trip behaviour and the ATS short-circuit declaration.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Is the LEEYEE compact ATS a breaker-based CB Class ATS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>Do not determine IEC class from product appearance. The exact classification and short-circuit ratings of a selected LEEYEE model should be confirmed from its model-specific technical documentation. The CB Class discussion in this article is included to explain the difference between transfer architectures.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Should the utility and generator sides use the same MCCB?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>Not automatically. The two sources can have different operating current, fault contribution and protection requirements. Check each source independently before fixing the breaker model or trip settings.<\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does using compliant ATS and MCCBs make the whole distribution panel compliant?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>No. Component conformity and complete-assembly verification are separate issues. Where IEC 61439 applies, the completed panel must also address the applicable assembly requirements. <a class=\"leeyee-ref\" href=\"#ref-6\">[6]<\/a><a class=\"leeyee-ref\" href=\"#ref-7\">[7]<\/a><\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-references\">\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>\r\n      <li id=\"ref-1\">\r\n        <strong>IEC.<\/strong>\r\n        IEC 60947-6-1:2026,\r\n        <em>Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-2\">\r\n        <strong>IEC.<\/strong>\r\n        IEC 60947-2:2024,\r\n        <em>Low-voltage switchgear and controlgear \u2014 Part 2: Circuit-breakers<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/66277\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-3\">\r\n        <strong>ABB.<\/strong>\r\n        <em>How to Select an Automatic Transfer Switch Class<\/em>.\r\n        Technical guidance covering Class PC, Class CB, Iq, Icw and short-circuit protective-device coordination.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/a0a6a4a06b204e7bbf5988e6d35ee364\/ATS%20white%20paper_1SCC303022C0201_20-09.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB Library<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-4\">\r\n        <strong>Schneider Electric.<\/strong>\r\n        <em>Source Changeover Switches \/ TransferPacT<\/em>.\r\n        Reference information illustrating breaker-based Class CB and switch-disconnector-based Class PC transfer architectures.\r\n        <a href=\"https:\/\/www.se.com\/sg\/en\/product-subcategory\/4260-source-changeover-switches\/\" target=\"_blank\" rel=\"noopener noreferrer\">Schneider Electric<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-5\">\r\n        <strong>ABB.<\/strong>\r\n        <em>Selectivity Techniques<\/em>.\r\n        Technical guidance on protection selectivity and coordination.\r\n        <a href=\"https:\/\/new.abb.com\/low-voltage\/solutions\/selectivity\/basic-concepts\/selectivity-techniques\" target=\"_blank\" rel=\"noopener noreferrer\">ABB Low Voltage<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-6\">\r\n        <strong>IEC.<\/strong>\r\n        IEC 61439-1:2020,\r\n        <em>Low-voltage switchgear and controlgear assemblies \u2014 Part 1: General rules<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/32338\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ref-7\">\r\n        <strong>IEC.<\/strong>\r\n        IEC 61439-2:2020,\r\n        <em>Low-voltage switchgear and controlgear assemblies \u2014 Part 2: Power switchgear and controlgear assemblies<\/em>.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/30043\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/div>\r\n\r\n<script>\r\ndocument.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>\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>When a compact automatic transfer switch is installed in a distribution panel, one of the most important questions is not simply which ATS current rating to choose. The panel designer also needs to decide how the ATS is protected, whether MCCBs belong on the source side, load side or both, and how the complete protection&#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-31252","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>MCCB Before or After ATS? 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