{"id":31214,"date":"2026-09-18T09:28:37","date_gmt":"2026-09-18T01:28:37","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31214"},"modified":"2026-09-18T09:28:56","modified_gmt":"2026-09-18T01:28:56","slug":"cb-class-automatic-transfer-switch-meaning-protection-and-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/es\/cb-class-automatic-transfer-switch\/","title":{"rendered":"CB Class Automatic Transfer Switch: Meaning, Protection and Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31214\" class=\"elementor elementor-31214\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d8e80f4 e-flex e-con-boxed e-con e-parent\" data-id=\"d8e80f4\" 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-bd9969b elementor-widget elementor-widget-html\" data-id=\"bd9969b\" 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-cb-class-ats-guide {\r\n  --leeyee-blue: #004898;\r\n  --leeyee-blue-dark: #003b7d;\r\n  --leeyee-blue-soft: #eef5ff;\r\n  --leeyee-blue-soft-2: #f7fbff;\r\n  --leeyee-text: #243447;\r\n  --leeyee-heading: #152638;\r\n  --leeyee-muted: #5f6f7f;\r\n  --leeyee-border: #d9e3ec;\r\n  --leeyee-border-strong: #bdd0e2;\r\n  --leeyee-warning-bg: #fff9ed;\r\n  --leeyee-warning-border: #e1a436;\r\n  --leeyee-warning-text: #684b13;\r\n  --leeyee-radius: 12px;\r\n  --leeyee-shadow: 0 8px 26px rgba(24,57,88,.07);\r\n  max-width: 840px;\r\n  margin: 0 auto;\r\n  padding: 12px 24px 64px;\r\n  color: var(--leeyee-text);\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  box-sizing: border-box;\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide *,\r\n#leeyee-cb-class-ats-guide *::before,\r\n#leeyee-cb-class-ats-guide *::after {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide strong {\r\n  color: var(--leeyee-heading);\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide a {\r\n  color: var(--leeyee-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-cb-class-ats-guide a:hover {\r\n  color: var(--leeyee-blue-dark);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide a:focus-visible {\r\n  outline: 3px solid rgba(0,72,152,.24);\r\n  outline-offset: 3px;\r\n  border-radius: 3px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide h2 {\r\n  margin: 54px 0 18px;\r\n  color: var(--leeyee-heading);\r\n  font-size: clamp(28px,3.4vw,34px);\r\n  line-height: 1.22;\r\n  letter-spacing: -.02em;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide h3 {\r\n  margin: 34px 0 13px;\r\n  color: var(--leeyee-heading);\r\n  font-size: clamp(22px,2.7vw,25px);\r\n  line-height: 1.3;\r\n  font-weight: 720;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-article-intro {\r\n  margin: 0 0 28px;\r\n  color: #34495e;\r\n  font-size: 18px;\r\n  line-height: 1.72;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-article-intro p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-kicker {\r\n  display: inline-block;\r\n  margin: 0 0 12px;\r\n  color: var(--leeyee-blue);\r\n  font-size: 13px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .08em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-quick-answer,\r\n#leeyee-cb-class-ats-guide .leeyee-product-boundary {\r\n  margin: 30px 0 38px;\r\n  padding: 24px 26px;\r\n  background: var(--leeyee-blue-soft-2);\r\n  border: 1px solid var(--leeyee-border-strong);\r\n  border-left: 5px solid var(--leeyee-blue);\r\n  border-radius: var(--leeyee-radius);\r\n  box-shadow: var(--leeyee-shadow);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-product-boundary {\r\n  background: #fff;\r\n  border-left-color: #5e7f9f;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-quick-answer__label,\r\n#leeyee-cb-class-ats-guide .leeyee-boundary-label {\r\n  display: block;\r\n  margin-bottom: 10px;\r\n  color: var(--leeyee-blue);\r\n  font-size: 14px;\r\n  line-height: 1.4;\r\n  font-weight: 800;\r\n  letter-spacing: .04em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-quick-answer p:last-child,\r\n#leeyee-cb-class-ats-guide .leeyee-product-boundary p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-key-line {\r\n  margin: 24px 0;\r\n  padding: 16px 20px;\r\n  background: #fff;\r\n  border-left: 4px solid var(--leeyee-blue);\r\n  color: var(--leeyee-heading);\r\n  font-size: 18px;\r\n  line-height: 1.6;\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-buyer-meaning {\r\n  margin: 24px 0;\r\n  padding: 20px 22px;\r\n  background: var(--leeyee-blue-soft);\r\n  border-radius: 10px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-buyer-meaning strong:first-child {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: var(--leeyee-blue);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-warning {\r\n  margin: 28px 0;\r\n  padding: 21px 23px;\r\n  background: var(--leeyee-warning-bg);\r\n  border: 1px solid #ecd7a8;\r\n  border-left: 5px solid var(--leeyee-warning-border);\r\n  border-radius: 10px;\r\n  color: var(--leeyee-warning-text);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-warning strong {\r\n  color: #5c410d;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-warning p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-engineering-note {\r\n  margin: 24px 0;\r\n  padding: 18px 21px;\r\n  border: 1px solid var(--leeyee-border);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide ul,\r\n#leeyee-cb-class-ats-guide ol {\r\n  margin: 14px 0 22px;\r\n  padding-left: 24px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide li {\r\n  margin: 7px 0;\r\n  padding-left: 3px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-clean-list {\r\n  list-style: none;\r\n  padding-left: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-clean-list li {\r\n  position: relative;\r\n  padding-left: 25px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-clean-list li::before {\r\n  content: \"\";\r\n  position: absolute;\r\n  top: .73em;\r\n  left: 3px;\r\n  width: 7px;\r\n  height: 7px;\r\n  border-radius: 50%;\r\n  background: var(--leeyee-blue);\r\n  transform: translateY(-50%);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-figure {\r\n  margin: 32px -36px 38px;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  margin: 0 auto;\r\n  border: 1px solid var(--leeyee-border);\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  box-shadow: 0 10px 32px rgba(19,51,81,.08);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-figure figcaption {\r\n  max-width: 760px;\r\n  margin: 11px auto 0;\r\n  padding: 0 18px;\r\n  color: var(--leeyee-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n  text-align: left;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-table-wrap {\r\n  width: 100%;\r\n  margin: 22px 0 12px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide 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(--leeyee-border);\r\n  border-radius: 10px;\r\n  overflow: hidden;\r\n  background: #fff;\r\n  font-size: 15px;\r\n  line-height: 1.55;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide thead th {\r\n  padding: 13px 14px;\r\n  background: var(--leeyee-blue);\r\n  color: #fff;\r\n  border-right: 1px solid rgba(255,255,255,.18);\r\n  text-align: left;\r\n  vertical-align: top;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide thead th:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide tbody td {\r\n  padding: 13px 14px;\r\n  border-top: 1px solid var(--leeyee-border);\r\n  border-right: 1px solid var(--leeyee-border);\r\n  vertical-align: top;\r\n  color: var(--leeyee-text);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide tbody tr:first-child td {\r\n  border-top: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide tbody td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide tbody tr:nth-child(even) td {\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-table-note {\r\n  margin: 9px 0 28px;\r\n  color: var(--leeyee-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-two-col-table th:first-child,\r\n#leeyee-cb-class-ats-guide .leeyee-two-col-table td:first-child {\r\n  width: 36%;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-three-col-table th:first-child,\r\n#leeyee-cb-class-ats-guide .leeyee-three-col-table td:first-child {\r\n  width: 32%;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-three-col-table th:nth-child(2),\r\n#leeyee-cb-class-ats-guide .leeyee-three-col-table td:nth-child(2),\r\n#leeyee-cb-class-ats-guide .leeyee-three-col-table th:nth-child(3),\r\n#leeyee-cb-class-ats-guide .leeyee-three-col-table td:nth-child(3) {\r\n  width: 34%;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-checklist {\r\n  margin: 30px 0;\r\n  padding: 24px 26px;\r\n  background: var(--leeyee-blue-soft-2);\r\n  border: 1px solid var(--leeyee-border-strong);\r\n  border-radius: var(--leeyee-radius);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-checklist h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-checklist ul {\r\n  columns: 2;\r\n  column-gap: 34px;\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-checklist li {\r\n  break-inside: avoid;\r\n  margin-bottom: 9px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-related {\r\n  margin: 36px 0 10px;\r\n  padding: 22px 24px;\r\n  border-top: 1px solid var(--leeyee-border);\r\n  border-bottom: 1px solid var(--leeyee-border);\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-related h3 {\r\n  margin: 0 0 12px;\r\n  font-size: 21px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-related p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-cta {\r\n  margin: 36px 0 48px;\r\n  padding: 26px;\r\n  border: 1px solid var(--leeyee-border-strong);\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  box-shadow: var(--leeyee-shadow);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-cta h3 {\r\n  margin: 0 0 12px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-cta p:last-of-type {\r\n  margin-bottom: 20px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  min-height: 50px;\r\n  max-width: 100%;\r\n  margin: 0;\r\n  padding: 0 24px;\r\n  border: 2px solid var(--leeyee-blue);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: var(--leeyee-blue);\r\n  box-shadow: 0 5px 14px rgba(0,72,152,.12);\r\n  font: inherit;\r\n  font-size: 16px;\r\n  font-weight: 700;\r\n  line-height: 1.2;\r\n  text-align: center;\r\n  cursor: pointer;\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-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn:hover {\r\n  background: var(--leeyee-blue);\r\n  color: #fff;\r\n  border-color: var(--leeyee-blue);\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 8px 18px rgba(0,72,152,.19);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn:focus-visible {\r\n  outline: 3px solid rgba(0,72,152,.28);\r\n  outline-offset: 3px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-about-btn-light .w-btn-label {\r\n  display: inline-block;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-faq {\r\n  margin-top: 20px;\r\n  border-top: 1px solid var(--leeyee-border);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-faq-item {\r\n  padding: 23px 0;\r\n  border-bottom: 1px solid var(--leeyee-border);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-faq-item h3 {\r\n  margin: 0 0 9px;\r\n  font-size: 21px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-faq-item p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-references {\r\n  margin-top: 58px;\r\n  padding-top: 4px;\r\n  border-top: 2px solid var(--leeyee-border);\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-references ol {\r\n  padding-left: 22px;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-references li {\r\n  margin-bottom: 12px;\r\n  color: var(--leeyee-muted);\r\n  font-size: 14px;\r\n  line-height: 1.62;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-ref {\r\n  white-space: nowrap;\r\n  font-size: .78em;\r\n  vertical-align: super;\r\n  line-height: 0;\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-cb-class-ats-guide .leeyee-ref a {\r\n  text-decoration: none;\r\n}\r\n\r\n@media (prefers-reduced-motion: reduce) {\r\n  #leeyee-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n    transition: none;\r\n  }\r\n}\r\n\r\n@media (max-width:1024px) {\r\n  #leeyee-cb-class-ats-guide .leeyee-figure {\r\n    margin-left: -22px;\r\n    margin-right: -22px;\r\n  }\r\n}\r\n\r\n@media (max-width:820px) {\r\n  #leeyee-cb-class-ats-guide {\r\n    padding-left: 22px;\r\n    padding-right: 22px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide .leeyee-figure {\r\n    margin-left: 0;\r\n    margin-right: 0;\r\n  }\r\n}\r\n\r\n@media (max-width:768px) {\r\n  #leeyee-cb-class-ats-guide {\r\n    font-size: 16.5px;\r\n    line-height: 1.7;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide h2 {\r\n    margin-top: 46px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide .leeyee-checklist ul {\r\n    columns: 1;\r\n  }\r\n}\r\n\r\n@media (max-width:600px) {\r\n  #leeyee-cb-class-ats-guide {\r\n    padding: 8px 18px 52px;\r\n    font-size: 16px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide .leeyee-article-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide h2 {\r\n    margin: 42px 0 15px;\r\n    font-size: 27px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide h3 {\r\n    font-size: 22px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide table,\r\n  #leeyee-cb-class-ats-guide thead,\r\n  #leeyee-cb-class-ats-guide tbody,\r\n  #leeyee-cb-class-ats-guide th,\r\n  #leeyee-cb-class-ats-guide td,\r\n  #leeyee-cb-class-ats-guide tr {\r\n    display: block;\r\n    width: 100% !important;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide thead {\r\n    position: absolute;\r\n    width: 1px !important;\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    border: 0;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide table {\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide tbody tr {\r\n    margin-bottom: 14px;\r\n    overflow: hidden;\r\n    border: 1px solid var(--leeyee-border);\r\n    border-radius: 9px;\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide tbody td {\r\n    position: relative;\r\n    padding: 10px 13px 11px;\r\n    border: 0;\r\n    border-top: 1px solid var(--leeyee-border);\r\n    background: #fff !important;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide tbody td:first-child {\r\n    border-top: 0;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide tbody td::before {\r\n    content: attr(data-label);\r\n    display: block;\r\n    margin-bottom: 3px;\r\n    color: var(--leeyee-blue);\r\n    font-size: 12px;\r\n    line-height: 1.35;\r\n    font-weight: 800;\r\n    letter-spacing: .03em;\r\n    text-transform: uppercase;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding: 0 18px;\r\n  }\r\n}\r\n\r\n@media (max-width:480px) {\r\n  #leeyee-cb-class-ats-guide {\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide .leeyee-quick-answer,\r\n  #leeyee-cb-class-ats-guide .leeyee-product-boundary,\r\n  #leeyee-cb-class-ats-guide .leeyee-warning,\r\n  #leeyee-cb-class-ats-guide .leeyee-buyer-meaning,\r\n  #leeyee-cb-class-ats-guide .leeyee-checklist,\r\n  #leeyee-cb-class-ats-guide .leeyee-cta {\r\n    padding: 18px 17px;\r\n  }\r\n}\r\n\r\n@media (max-width:390px) {\r\n  #leeyee-cb-class-ats-guide {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  #leeyee-cb-class-ats-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n    font-size: 15px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-cb-class-ats-guide\">\r\n\r\n  <div class=\"leeyee-article-intro\">\r\n    <span class=\"leeyee-kicker\">Engineering Selection Guide<\/span>\r\n    <p>A <strong>CB Class automatic transfer switch<\/strong> is defined by more than automatic source transfer. Its key engineering distinction is the ability to <strong>make and break short-circuit current within its assigned ratings<\/strong>.<\/p>\r\n    <p>This guide explains what CB Class means, how it differs from PC Class, and how a buyer should determine whether a project actually requires a breaker-based CB Class solution rather than a compact transfer switch.<\/p>\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-quick-answer\" aria-label=\"Quick answer\">\r\n    <span class=\"leeyee-quick-answer__label\">Quick Answer<\/span>\r\n    <p>Under the IEC 60947-6-1 transfer-switching framework, <strong>Class CB transfer switching equipment can make and break short-circuit current<\/strong>. Class PC equipment can make and withstand short-circuit current under its assigned conditions, but short-circuit interruption is not its defining function.<span class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><span class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n    <p>If a project explicitly specifies Class CB, do not assume that any compact ATS meets that requirement. Confirm the equipment class, short-circuit ratings, breaker arrangement and manufacturer documentation for the exact model.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"leeyee-product-boundary\" aria-label=\"LEEYEE product boundary\">\r\n    <span class=\"leeyee-boundary-label\">Important LEEYEE Product Boundary<\/span>\r\n    <p>LEEYEE's current compact ATS-63 range is presented for automatic source transfer in small backup-power and distribution applications. The current public product guidance lists 2P \/ 4P versions and 6A\u201363A current options and states that the ATS does not replace breakers, fuses, SPDs or the wider protection design.<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/p>\r\n    <p><strong>This article does not present LEEYEE ATS-63 as a Class CB product.<\/strong> A Class CB designation should only be used where model-specific manufacturer documentation explicitly supports that classification and its assigned short-circuit ratings.<\/p>\r\n  <\/section>\r\n\r\n  <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/cb-class-automatic-transfer-switch\/#what-is-a-cb-class-automatic-transfer-switch\" >What Is a CB Class Automatic Transfer Switch?<\/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\/es\/cb-class-automatic-transfer-switch\/#how-does-a-breaker-based-cb-class-ats-work\" >How Does a Breaker-Based CB Class ATS Work?<\/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\/es\/cb-class-automatic-transfer-switch\/#cb-class-does-not-simply-mean-%e2%80%9cats-with-protection%e2%80%9d\" >CB Class Does Not Simply Mean \u201cATS With Protection\u201d<\/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\/es\/cb-class-automatic-transfer-switch\/#cb-class-vs-pc-class-ats-what-is-the-real-difference\" >CB Class vs PC Class ATS: What Is the Real Difference?<\/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\/es\/cb-class-automatic-transfer-switch\/#is-leeyee-ats-63-a-cb-class-automatic-transfer-switch\" >Is LEEYEE ATS-63 a CB Class Automatic Transfer Switch?<\/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\/es\/cb-class-automatic-transfer-switch\/#when-is-a-compact-ats-different-from-a-cb-class-solution\" >When Is a Compact ATS Different From a CB Class Solution?<\/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\/es\/cb-class-automatic-transfer-switch\/#does-a-cb-class-ats-provide-short-circuit-protection\" >Does a CB Class ATS Provide Short-Circuit Protection?<\/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\/es\/cb-class-automatic-transfer-switch\/#does-a-cb-class-ats-also-provide-overload-protection\" >Does a CB Class ATS Also Provide Overload Protection?<\/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\/es\/cb-class-automatic-transfer-switch\/#which-parameters-matter-most-in-a-class-cb-project\" >Which Parameters Matter Most in a Class CB Project?<\/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\/es\/cb-class-automatic-transfer-switch\/#why-protection-coordination-still-matters\" >Why Protection Coordination Still Matters<\/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\/es\/cb-class-automatic-transfer-switch\/#when-does-a-project-actually-need-class-cb\" >When Does a Project Actually Need Class CB?<\/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\/es\/cb-class-automatic-transfer-switch\/#when-is-leeyee-ats-63-the-more-relevant-product-type\" >When Is LEEYEE ATS-63 the More Relevant Product Type?<\/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\/es\/cb-class-automatic-transfer-switch\/#how-to-decide-compact-ats-or-class-cb\" >How to Decide: Compact ATS or Class CB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/cb-class-automatic-transfer-switch\/#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-15\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/es\/cb-class-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-is-a-cb-class-automatic-transfer-switch\"><\/span>What Is a CB Class Automatic Transfer Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>IEC 60947-6-1 covers transfer switching equipment used to transfer a load between power supply sources. The current 2026 edition applies to systems with rated voltage not exceeding 1,000 V AC or 1,500 V DC and covers manually operated, remotely operated and automatic transfer switching equipment, together with other defined configurations.<span class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n\r\n  <p>For Class CB equipment, the important distinction is its short-circuit switching duty. In practical terms, Class CB transfer equipment is designed to <strong>make and break short-circuit current within its assigned capability<\/strong>.<span class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n\r\n  <div class=\"leeyee-key-line\">\r\n    PC Class is primarily associated with transfer plus short-circuit withstand capability. CB Class adds short-circuit breaking capability within the assigned equipment ratings.\r\n  <\/div>\r\n\r\n  <p>This is more accurate than saying \u201cPC has no protection and CB has protection.\u201d Real switchboards require a broader protection study. The class designation alone does not tell an engineer the breaker frame, trip settings, available breaking capacity, selectivity or complete fault-clearing behaviour of the installation.<\/p>\r\n\r\n  <div class=\"leeyee-buyer-meaning\">\r\n    <strong>Buyer meaning<\/strong>\r\n    If a specification says \u201cCB Class ATS required,\u201d ask the supplier for the exact switching devices, short-circuit ratings, trip-unit information, pole arrangement and documentation for the complete transfer equipment.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-a-breaker-based-cb-class-ats-work\"><\/span>How Does a Breaker-Based CB Class ATS Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Many practical CB Class transfer systems use circuit breakers as their main switching devices. A typical arrangement can include a normal-source breaker, standby-source breaker, mechanical and\/or electrical interlocking, operating mechanisms and an ATS controller. Siemens, for example, documents Class CB arrangements using motor-operated circuit breakers with automatic transfer control.<span class=\"leeyee-ref\"><a href=\"#ref-4\">[4]<\/a><\/span><\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/cb-class-ats-breaker-based-architecture.webp\"\r\n      alt=\"Breaker-based CB Class automatic transfer switch architecture with normal source, standby source, circuit breakers, interlocking, ATS controller, and load\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Typical breaker-based Class CB architecture for technical explanation. This diagram is not a representation of the internal construction of the LEEYEE ATS-63 compact transfer switch. Actual breaker type, controller functions and interlocking must be verified for the selected Class CB equipment.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>The controller monitors the available sources and commands transfer according to the configured logic. In an open-transition arrangement, the connected source is opened before the alternative source is closed.<\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\">\r\n    <strong>Engineering note:<\/strong> Transfer timing, monitoring thresholds, generator-start logic and retransfer behaviour are product-specific. They should be confirmed from the controller and ATS documentation rather than inferred from the words \u201cClass CB.\u201d\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"cb-class-does-not-simply-mean-%e2%80%9cats-with-protection%e2%80%9d\"><\/span>CB Class Does Not Simply Mean \u201cATS With Protection\u201d<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The phrase \u201cCB Class ATS with protection\u201d is commonly used, but several engineering functions need to be separated.<\/p>\r\n\r\n  <h3>Transfer Function<\/h3>\r\n  <p>The ATS transfers the load between two power sources according to its control logic.<\/p>\r\n\r\n  <h3>Short-Circuit Breaking Capability<\/h3>\r\n  <p>Class CB identifies the ability to make and break short-circuit current within the equipment's assigned ratings.<span class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n\r\n  <h3>Overcurrent Protection<\/h3>\r\n  <p>If the CB Class design uses circuit breakers with overcurrent releases, the actual breaker and trip unit may provide overload and short-circuit protective functions. The functions available depend on the exact breaker configuration.<\/p>\r\n\r\n  <h3>Protection Coordination<\/h3>\r\n  <p>The ATS breaker still has to work correctly with upstream and downstream protective devices. ABB's IEC-market ATS guidance highlights selectivity and coordination considerations when Class CB equipment forms part of the distribution protection system.<span class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Important:<\/strong> \u201cCB Class\u201d does not mean that no further protection study is required. Fault level, breaker ratings, trip settings, conductor protection and protective-device coordination still need project-specific verification.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"cb-class-vs-pc-class-ats-what-is-the-real-difference\"><\/span>CB Class vs PC Class ATS: What Is the Real Difference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>The most useful comparison is not which class is \u201cbetter.\u201d The real question is what the transfer equipment is designed to do under short-circuit conditions.<\/p>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/pc-class-vs-cb-class-short-circuit-duty.webp\"\r\n      alt=\"PC Class versus CB Class ATS comparison showing short-circuit withstand and short-circuit breaking responsibilities\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      The key engineering distinction is \u201cwithstand\u201d versus \u201cbreak.\u201d This is a standards-based comparison of transfer-switch classes, not a claim that the LEEYEE ATS-63 belongs to either class without model-specific supporting documentation.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-three-col-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Engineering Question<\/th>\r\n          <th>CB Class ATS<\/th>\r\n          <th>PC Class ATS<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Engineering Question\"><strong>Transfers between sources<\/strong><\/td>\r\n          <td data-label=\"CB Class ATS\">Yes<\/td>\r\n          <td data-label=\"PC Class ATS\">Yes<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Engineering Question\"><strong>Short-circuit making capability<\/strong><\/td>\r\n          <td data-label=\"CB Class ATS\">Yes, within assigned ratings<\/td>\r\n          <td data-label=\"PC Class ATS\">Yes, within assigned ratings<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Engineering Question\"><strong>Short-circuit withstand<\/strong><\/td>\r\n          <td data-label=\"CB Class ATS\">Depends on assigned equipment characteristics<\/td>\r\n          <td data-label=\"PC Class ATS\">Core part of Class PC duty<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Engineering Question\"><strong>Short-circuit breaking<\/strong><\/td>\r\n          <td data-label=\"CB Class ATS\"><strong>Yes, within assigned capability<\/strong><\/td>\r\n          <td data-label=\"PC Class ATS\">Not the defining Class PC function<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Engineering Question\"><strong>Typical switching basis<\/strong><\/td>\r\n          <td data-label=\"CB Class ATS\">Often circuit-breaker based<\/td>\r\n          <td data-label=\"PC Class ATS\">Often dedicated transfer \/ switch based<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Engineering Question\"><strong>Main protection focus<\/strong><\/td>\r\n          <td data-label=\"CB Class ATS\">Breaking capability, trip functions and coordination<\/td>\r\n          <td data-label=\"PC Class ATS\">Withstand capability and coordinated external protection<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"leeyee-table-note\">\r\n    Procurement conclusion: neither class is universally superior. The correct choice depends on the single-line diagram, fault level, protection architecture and project specification.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"is-leeyee-ats-63-a-cb-class-automatic-transfer-switch\"><\/span>Is LEEYEE ATS-63 a CB Class Automatic Transfer Switch?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p><strong>Do not classify it as Class CB from appearance, current rating or the ATS-63 model name alone.<\/strong><\/p>\r\n\r\n  <p>LEEYEE's current public ATS guidance describes ATS-63 as a compact automatic source-transfer product available in 2P \/ 4P and 6A\u201363A versions. It also states that an ATS does not replace breakers, fuses, SPDs or grounding within the wider protection design.<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/p>\r\n\r\n  <p>That public information does not, by itself, establish the Class CB short-circuit breaking classification discussed in this article.<\/p>\r\n\r\n  <div class=\"leeyee-buyer-meaning\">\r\n    <strong>For a real project<\/strong>\r\n    If your specification explicitly requires \u201cIEC Class CB,\u201d ask for model-specific documentation showing the applicable TSE classification and assigned short-circuit performance. Do not substitute a compact ATS solely because its normal current rating matches the load.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-is-a-compact-ats-different-from-a-cb-class-solution\"><\/span>When Is a Compact ATS Different From a CB Class Solution?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-three-col-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Project Question<\/th>\r\n          <th>Compact ATS-63 Type Application<\/th>\r\n          <th>Class CB Project Requirement<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Project Question\"><strong>Primary purpose<\/strong><\/td>\r\n          <td data-label=\"Compact ATS\">Automatic transfer between two available AC sources<\/td>\r\n          <td data-label=\"Class CB\">Transfer plus assigned short-circuit breaking capability<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project Question\"><strong>Current range<\/strong><\/td>\r\n          <td data-label=\"Compact ATS\">LEEYEE public guidance lists 6A\u201363A<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/td>\r\n          <td data-label=\"Class CB\">Depends on the selected manufacturer and breaker platform<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project Question\"><strong>Breaker replacement<\/strong><\/td>\r\n          <td data-label=\"Compact ATS\">No \u2014 wider circuit protection remains separate<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/td>\r\n          <td data-label=\"Class CB\">Protective functions depend on actual breaker and trip configuration<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project Question\"><strong>Short-circuit breaking claim<\/strong><\/td>\r\n          <td data-label=\"Compact ATS\">Do not assume without model-specific documentation<\/td>\r\n          <td data-label=\"Class CB\">Must be supported by assigned equipment ratings<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project Question\"><strong>Typical decision driver<\/strong><\/td>\r\n          <td data-label=\"Compact ATS\">Voltage, current, poles, source type and transfer requirement<\/td>\r\n          <td data-label=\"Class CB\">Fault current, breaker capability, trip unit and protection coordination<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-a-cb-class-ats-provide-short-circuit-protection\"><\/span>Does a CB Class ATS Provide Short-Circuit Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>A Class CB ATS has short-circuit breaking capability within its assigned ratings. However, that does not mean any Class CB ATS can safely interrupt any prospective fault current.<\/p>\r\n\r\n  <p>The engineer still needs to compare the equipment ratings with the prospective short-circuit conditions at the installation point.<\/p>\r\n\r\n  <p>Where IEC 60947-2 circuit breakers form part of the arrangement, relevant characteristics can include applicable breaking capacities and, where assigned, short-time withstand characteristics. Use the data for the exact breaker at the actual system voltage.<span class=\"leeyee-ref\"><a href=\"#ref-2\">[2]<\/a><\/span><\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"does-a-cb-class-ats-also-provide-overload-protection\"><\/span>Does a CB Class ATS Also Provide Overload Protection?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>It can, depending on the actual circuit breaker and trip unit.<\/p>\r\n\r\n  <p>A thermal-magnetic or electronic release may provide different protection functions and adjustment ranges. Those characteristics belong to the selected breaker, not simply to the words \u201cCB Class.\u201d<\/p>\r\n\r\n  <p>This distinction is particularly important when comparing a breaker-based Class CB system with a compact ATS such as ATS-63. A compact source-transfer device should not be assumed to perform the same protective role unless its model-specific documentation explicitly states that capability.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"which-parameters-matter-most-in-a-class-cb-project\"><\/span>Which Parameters Matter Most in a Class CB Project?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-two-col-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Parameter to Confirm<\/th>\r\n          <th>Why It Matters<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Rated operational voltage<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">The complete transfer equipment must match the system voltage.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Rated current<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Confirms continuous-load suitability but does not define fault capability.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Prospective short-circuit current<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Determines the fault level the proposed equipment must be evaluated against.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Breaker family \/ frame<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Different breaker platforms can have different short-circuit characteristics.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Breaking capacity<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Must be suitable for the installation fault level and voltage.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Trip-unit type<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Determines available protection functions and settings.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Protection coordination<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Helps ensure the intended protective device clears a fault.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Parameter\"><strong>Poles and neutral arrangement<\/strong><\/td>\r\n          <td data-label=\"Buyer Meaning\">Must match the system architecture and project requirements.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-protection-coordination-still-matters\"><\/span>Why Protection Coordination Still Matters<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>Consider a fault on one downstream feeder. The protection design may require the downstream feeder breaker to operate while the incoming transfer equipment remains in service.<\/p>\r\n\r\n  <p>If protective devices are not coordinated correctly, a local fault may disconnect a larger part of the distribution system than intended.<\/p>\r\n\r\n  <p>A Class CB project can therefore require review of:<\/p>\r\n\r\n  <ul class=\"leeyee-clean-list\">\r\n    <li>prospective short-circuit current;<\/li>\r\n    <li>upstream protective devices;<\/li>\r\n    <li>ATS breaker time-current characteristics;<\/li>\r\n    <li>downstream breaker or fuse characteristics;<\/li>\r\n    <li>instantaneous and short-time settings where applicable;<\/li>\r\n    <li>selectivity requirements;<\/li>\r\n    <li>generator-side fault behaviour where a generator is one source.<\/li>\r\n  <\/ul>\r\n\r\n  <div class=\"leeyee-key-line\">\r\n    \u201cClass CB\u201d is a transfer-switch classification. It is not a substitute for the complete protection design.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-does-a-project-actually-need-class-cb\"><\/span>When Does a Project Actually Need Class CB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>A Class CB solution can be appropriate when fault interruption is intentionally integrated at the transfer point and the project specifies breaker-based protection characteristics.<\/p>\r\n\r\n  <h3>Breaker-Based Source Incomers<\/h3>\r\n  <p>If both source incomers are designed around MCCBs or ACBs and the transfer point also performs defined protective duties, a Class CB architecture may be appropriate.<\/p>\r\n\r\n  <h3>Projects With Explicit Short-Circuit Requirements<\/h3>\r\n  <p>If the consultant or panel specification calls for a defined breaker breaking capacity, trip unit or selectivity requirement at the transfer point, the transfer equipment has to be evaluated against those requirements.<\/p>\r\n\r\n  <h3>Larger Engineered Distribution Systems<\/h3>\r\n  <p>Industrial or project switchboards may use breaker-based transfer as part of the wider distribution protection scheme. The final configuration still depends on the project single-line diagram and coordination study.<\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-is-leeyee-ats-63-the-more-relevant-product-type\"><\/span>When Is LEEYEE ATS-63 the More Relevant Product Type?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>LEEYEE ATS-63 is positioned as a compact transfer switch for applications where the main requirement is automatic changeover between two AC sources rather than integrated Class CB fault interruption.<\/p>\r\n\r\n  <p>Current LEEYEE public guidance lists:<\/p>\r\n\r\n  <ul class=\"leeyee-clean-list\">\r\n    <li>2P and 4P configurations;<\/li>\r\n    <li>6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A and 63A current options;<\/li>\r\n    <li>AC110V, AC220V and AC400V configurations;<\/li>\r\n    <li>50\/60Hz configurations;<\/li>\r\n    <li>manual and automatic operation;<\/li>\r\n    <li>compact backup-source switching applications.<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/li>\r\n  <\/ul>\r\n\r\n  <p>For these applications, the ATS should still be used together with the necessary breakers, fuses, SPDs, grounding and cable protection required by the complete electrical system.<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <strong>Do not use ATS-63 as a direct substitute for a specified Class CB transfer switch solely because the current rating fits.<\/strong> If a project specification explicitly requires Class CB short-circuit breaking performance, confirm that requirement separately before product selection.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-to-decide-compact-ats-or-class-cb\"><\/span>How to Decide: Compact ATS or Class CB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <figure class=\"leeyee-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/cb-class-ats-procurement-selection-flow.webp\"\r\n      alt=\"CB Class ATS procurement selection flow covering system voltage, load current, fault current, breaker, trip unit, protection coordination, poles, controller, and project standard\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Use the fault-current and protection requirements to decide whether a compact source-transfer product is sufficient or whether the project needs a breaker-based Class CB solution. This flow is a technical decision aid, not an ATS-63 product specification.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table class=\"leeyee-two-col-table\">\r\n      <thead>\r\n        <tr>\r\n          <th>Question<\/th>\r\n          <th>Selection Meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Question\"><strong>Do you mainly need automatic transfer between two AC sources?<\/strong><\/td>\r\n          <td data-label=\"Selection Meaning\">A compact ATS may be suitable if its voltage, current, poles and application conditions match.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Question\"><strong>Does the specification explicitly require Class CB?<\/strong><\/td>\r\n          <td data-label=\"Selection Meaning\">Use equipment with model-specific documentation supporting the required Class CB classification.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Question\"><strong>Must the transfer equipment itself interrupt short-circuit current?<\/strong><\/td>\r\n          <td data-label=\"Selection Meaning\">A breaker-based Class CB architecture may be required.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Question\"><strong>Are external breakers already defined?<\/strong><\/td>\r\n          <td data-label=\"Selection Meaning\">Review whether a compact transfer switch can work within the existing protection architecture.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Question\"><strong>Is the available fault current known?<\/strong><\/td>\r\n          <td data-label=\"Selection Meaning\">For a Class CB project, this is essential for verifying short-circuit suitability.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-checklist\">\r\n    <h3>What to Send Before ATS Selection<\/h3>\r\n    <ul>\r\n      <li>System voltage and frequency<\/li>\r\n      <li>Single-phase or three-phase<\/li>\r\n      <li>Rated load current<\/li>\r\n      <li>2P or 4P requirement<\/li>\r\n      <li>Normal source type<\/li>\r\n      <li>Backup source type<\/li>\r\n      <li>Prospective fault current, if known<\/li>\r\n      <li>Project-required ATS class<\/li>\r\n      <li>Required standard or certification<\/li>\r\n      <li>Single-line diagram, if available<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-cta\">\r\n    <h3>Check Whether LEEYEE ATS-63 Fits Your Project<\/h3>\r\n    <p>Send your system voltage, load current, pole requirement, normal and backup source information, and any project specification that mentions PC Class, CB Class or short-circuit performance.<\/p>\r\n    <p>LEEYEE can review whether the current ATS-63 compact transfer-switch range matches the application. If the specification requires a different transfer architecture, that requirement should be identified before model approval.<\/p>\r\n    <button\r\n      type=\"button\"\r\n      class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n      aria-label=\"Check ATS-63 Project Fit\">\r\n      <span class=\"w-btn-label\">Check ATS-63 Project Fit<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-related\" aria-label=\"Related reading\">\r\n    <h3>Related ATS Engineering Guides<\/h3>\r\n    <p>For general compact ATS selection, see the <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">Automatic Transfer Switch Working and Selection Guide<\/a>.<\/p>\r\n    <p>If you are comparing transfer-switch classifications, review the PC Class guide together with this CB Class article and verify the class against the exact model documentation before procurement.<\/p>\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    <section class=\"leeyee-faq-item\">\r\n      <h3>What is a CB Class automatic transfer switch?<\/h3>\r\n      <p>A CB Class automatic transfer switch is transfer switching equipment whose assigned capability includes making and breaking short-circuit current. The exact short-circuit ratings still have to be checked for the selected equipment.<span class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>Is LEEYEE ATS-63 a CB Class ATS?<\/h3>\r\n      <p>Do not make that classification from the product appearance or ATS-63 model name alone. The current public LEEYEE ATS information describes a compact 2P \/ 4P, 6A\u201363A transfer product and states that the ATS does not replace the wider breaker and protection design.<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span> A Class CB claim requires model-specific supporting documentation.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>What is the main difference between CB Class and PC Class?<\/h3>\r\n      <p>The key distinction is short-circuit duty. Class PC is associated with making and withstanding short-circuit current under assigned conditions, while Class CB includes short-circuit breaking capability within assigned ratings.<span class=\"leeyee-ref\"><a href=\"#ref-3\">[3]<\/a><\/span><\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>Does CB Class mean overload protection is always included?<\/h3>\r\n      <p>No. Available overload and short-circuit protection functions depend on the actual breaker and trip unit used in the complete transfer equipment.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>Can a compact 63A ATS replace a Class CB transfer switch?<\/h3>\r\n      <p>Not simply because both products have a similar normal-current rating. If the project requires Class CB short-circuit breaking capability, the selected equipment must have documentation supporting that classification and the required ratings.<\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>When is ATS-63 a more relevant choice?<\/h3>\r\n      <p>ATS-63 is relevant when the project needs compact automatic transfer between two compatible AC sources within its documented voltage, pole and current range, while circuit protection is provided as part of the wider electrical design.<span class=\"leeyee-ref\"><a href=\"#ref-6\">[6]<\/a><\/span><\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>Can two motorized breakers automatically be called a Class CB ATS?<\/h3>\r\n      <p>Not automatically. IEC 60947-6-1:2026 excludes transfer-switch configurations that are not fully manufacturer type-tested or marked according to the document as a complete transfer switch.<span class=\"leeyee-ref\"><a href=\"#ref-1\">[1]<\/a><\/span><\/p>\r\n    <\/section>\r\n\r\n    <section class=\"leeyee-faq-item\">\r\n      <h3>Should IEC Class CB terminology be used for a US project?<\/h3>\r\n      <p>IEC Class CB and UL 1008 belong to different standards frameworks. For a North American project, confirm the required UL 1008 listing and project-specific short-circuit and installation requirements separately.<span class=\"leeyee-ref\"><a href=\"#ref-5\">[5]<\/a><\/span><\/p>\r\n    <\/section>\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    <ol>\r\n      <li id=\"ref-1\">\r\n        International Electrotechnical Commission (IEC), <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment<\/em>, Fourth Edition, published 2 April 2026.\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      <li id=\"ref-2\">\r\n        International Electrotechnical Commission (IEC), <em>IEC 60947-2:2024 \u2014 Low-voltage switchgear and controlgear \u2014 Part 2: Circuit-breakers<\/em>, Sixth Edition.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/66277\" target=\"_blank\" rel=\"noopener noreferrer\">IEC official publication page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-3\">\r\n        ABB, <em>How to Select an Automatic Transfer Switch Class \u2014 A Guide for IEC Markets<\/em>. Technical guidance covering Class PC, Class CB, short-circuit performance and selectivity 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 technical white paper<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-4\">\r\n        Siemens, <em>3KC ATC6300 Transfer Control Device \u2014 Equipment Manual<\/em>. Technical information for automatic transfer control and Class CB arrangements using motor-operated circuit breakers.\r\n        <a href=\"https:\/\/cache.industry.siemens.com\/dl\/files\/149\/109755149\/att_953130\/v1\/MAN_L1V30535632002A-04_en_en-US.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Siemens equipment manual<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-5\">\r\n        UL Standards &amp; Engagement, <em>UL 1008 \u2014 Transfer Switch Equipment<\/em>, Edition 9.\r\n        <a href=\"https:\/\/www.shopulstandards.com\/ProductDetail.aspx?productId=UL1008_9_S_20220713\" target=\"_blank\" rel=\"noopener noreferrer\">UL Standards official page<\/a>.\r\n      <\/li>\r\n      <li id=\"ref-6\">\r\n        LEEYEE \/ CNSPD, <em>What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose<\/em>. Current public guidance for the LEEYEE ATS-63 compact transfer-switch range, including 2P \/ 4P versions, 6A\u201363A current options and the requirement for separate system protection.\r\n        <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\" target=\"_blank\" rel=\"noopener noreferrer\">LEEYEE ATS technical guide<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\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<\/article>\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>Engineering Selection GuideA CB Class automatic transfer switch is defined by more than automatic source transfer. Its key engineering distinction is the ability to make and break short-circuit current within its assigned ratings. This guide explains what CB Class means, how it differs from PC Class, and how a buyer should determine whether a project&#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-31214","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>CB Class Automatic Transfer Switch | CB vs PC ATS Guide<\/title>\n<meta name=\"description\" content=\"Learn what a CB Class automatic transfer switch means, how it differs from PC Class and compact ATS products, and what short-circuit, breaker and protection requirements to verify before selection.\" \/>\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\/es\/cb-class-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CB Class Automatic Transfer Switch | CB vs PC ATS Guide\" \/>\n<meta property=\"og:description\" content=\"Learn what a CB Class automatic transfer switch means, how it differs from PC Class and compact ATS products, and what short-circuit, breaker and protection requirements to verify before selection.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/es\/cb-class-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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