{"id":31208,"date":"2026-09-18T09:20:06","date_gmt":"2026-09-18T01:20:06","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31208"},"modified":"2026-09-18T09:20:34","modified_gmt":"2026-09-18T01:20:34","slug":"closed-transition-ats-guide-when-do-you-actually-need-one","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/closed-transition-ats\/","title":{"rendered":"Closed Transition ATS Guide: When Do You Actually Need One?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31208\" class=\"elementor elementor-31208\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5001a8d e-flex e-con-boxed e-con e-parent\" data-id=\"5001a8d\" 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-eb7e18f elementor-widget elementor-widget-html\" data-id=\"eb7e18f\" 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-closed-transition-ats-guide {\r\n  --ct-blue: #004898;\r\n  --ct-blue-dark: #00386f;\r\n  --ct-blue-soft: #f7fbff;\r\n  --ct-blue-pale: #eef5ff;\r\n  --ct-text: #25313d;\r\n  --ct-muted: #5e6b77;\r\n  --ct-border: #d9e3ec;\r\n  --ct-border-strong: #bfd1e2;\r\n  --ct-warning-bg: #fff9ed;\r\n  --ct-warning-border: #d99000;\r\n  --ct-success-bg: #f3faf6;\r\n  --ct-success-border: #43845e;\r\n  max-width: 960px;\r\n  margin: 0 auto;\r\n  padding: 0 22px 60px;\r\n  color: var(--ct-text);\r\n  font-family: inherit;\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-closed-transition-ats-guide *,\r\n#leeyee-closed-transition-ats-guide *::before,\r\n#leeyee-closed-transition-ats-guide *::after {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-section,\r\n#leeyee-closed-transition-ats-guide .ct-reading {\r\n  max-width: 840px;\r\n  margin-left: auto;\r\n  margin-right: auto;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide strong {\r\n  color: #172431;\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide a {\r\n  color: var(--ct-blue);\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide a:hover {\r\n  color: var(--ct-blue-dark);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide h2,\r\n#leeyee-closed-transition-ats-guide h3 {\r\n  color: #162534;\r\n  font-family: inherit;\r\n  line-height: 1.24;\r\n  letter-spacing: -0.015em;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide h2 {\r\n  margin: 52px 0 20px;\r\n  font-size: clamp(28px, 3.2vw, 34px);\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide h3 {\r\n  margin: 34px 0 14px;\r\n  font-size: clamp(21px, 2.5vw, 25px);\r\n  font-weight: 720;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-intro {\r\n  max-width: 840px;\r\n  margin: 0 auto 28px;\r\n  padding-top: 4px;\r\n  color: #344454;\r\n  font-size: 18px;\r\n  line-height: 1.72;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-intro p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-eyebrow {\r\n  display: inline-flex;\r\n  align-items: center;\r\n  gap: 8px;\r\n  margin-bottom: 13px;\r\n  color: var(--ct-blue);\r\n  font-size: 13px;\r\n  line-height: 1.35;\r\n  font-weight: 750;\r\n  letter-spacing: 0.08em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-eyebrow::before {\r\n  content: \"\";\r\n  width: 24px;\r\n  height: 3px;\r\n  border-radius: 3px;\r\n  background: var(--ct-blue);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-quick {\r\n  max-width: 840px;\r\n  margin: 28px auto 30px;\r\n  padding: 26px 28px;\r\n  border: 1px solid var(--ct-border-strong);\r\n  border-left: 5px solid var(--ct-blue);\r\n  border-radius: 12px;\r\n  background: var(--ct-blue-soft);\r\n  box-shadow: 0 7px 22px rgba(0,72,152,.06);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-quick h2 {\r\n  margin: 0 0 14px;\r\n  font-size: 27px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-keyline {\r\n  display: grid;\r\n  grid-template-columns: repeat(3,minmax(0,1fr));\r\n  gap: 12px;\r\n  margin: 22px 0 4px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-keyline-item {\r\n  padding: 15px 16px;\r\n  border: 1px solid #dbe7f2;\r\n  border-radius: 9px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-keyline-item b {\r\n  display: block;\r\n  margin-bottom: 4px;\r\n  color: var(--ct-blue);\r\n  font-size: 14px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-keyline-item span {\r\n  display: block;\r\n  color: #40505f;\r\n  font-size: 14px;\r\n  line-height: 1.5;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-product-scope {\r\n  max-width: 840px;\r\n  margin: 30px auto 42px;\r\n  padding: 25px 27px;\r\n  border: 1px solid #cbd9e5;\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  box-shadow: 0 6px 20px rgba(29,52,75,.05);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-product-scope h2 {\r\n  margin: 0 0 15px;\r\n  font-size: 27px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scope-badge {\r\n  display: inline-flex;\r\n  margin-bottom: 14px;\r\n  padding: 5px 10px;\r\n  border: 1px solid #d4e3ef;\r\n  border-radius: 999px;\r\n  background: var(--ct-blue-soft);\r\n  color: var(--ct-blue);\r\n  font-size: 12.5px;\r\n  font-weight: 800;\r\n  letter-spacing: .04em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scope-grid {\r\n  display: grid;\r\n  grid-template-columns: 1fr 1fr;\r\n  gap: 10px 22px;\r\n  margin: 20px 0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scope-item {\r\n  padding: 11px 0;\r\n  border-top: 1px solid #e3eaf0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scope-item b {\r\n  display: block;\r\n  margin-bottom: 3px;\r\n  color: #24384a;\r\n  font-size: 14px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scope-item span {\r\n  color: #586673;\r\n  font-size: 14px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-light-cta {\r\n  max-width: 840px;\r\n  margin: 28px auto 44px;\r\n  padding: 19px 22px;\r\n  display: flex;\r\n  align-items: center;\r\n  justify-content: space-between;\r\n  gap: 22px;\r\n  border-top: 1px solid var(--ct-border);\r\n  border-bottom: 1px solid var(--ct-border);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-light-cta p {\r\n  flex: 1 1 auto;\r\n  margin: 0;\r\n  color: #3a4957;\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .leeyee-about-btn-light {\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  min-height: 50px;\r\n  padding: 0 24px;\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  flex: 0 0 auto;\r\n  border: 1.5px solid var(--ct-blue);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: var(--ct-blue);\r\n  box-shadow: 0 5px 14px rgba(0,72,152,.10);\r\n  font: inherit;\r\n  font-size: 15px;\r\n  font-weight: 700;\r\n  line-height: 1.25;\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-closed-transition-ats-guide .leeyee-about-btn-light:hover {\r\n  background: var(--ct-blue);\r\n  color: #fff;\r\n  border-color: var(--ct-blue);\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 8px 18px rgba(0,72,152,.18);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .leeyee-about-btn-light:focus-visible {\r\n  outline: 3px solid rgba(0,72,152,.26);\r\n  outline-offset: 3px;\r\n  background: var(--ct-blue);\r\n  color: #fff;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .w-btn-label {\r\n  display: inline-block;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-figure {\r\n  max-width: 940px;\r\n  margin: 34px auto 42px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-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 var(--ct-border);\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  box-shadow: 0 7px 24px rgba(29,52,75,.07);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-figure figcaption {\r\n  max-width: 800px;\r\n  margin: 10px auto 0;\r\n  color: var(--ct-muted);\r\n  font-size: 13.5px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-callout,\r\n#leeyee-closed-transition-ats-guide .ct-warning,\r\n#leeyee-closed-transition-ats-guide .ct-note {\r\n  margin: 25px 0 30px;\r\n  padding: 20px 22px;\r\n  border-radius: 10px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-callout {\r\n  border: 1px solid #caddee;\r\n  border-left: 4px solid var(--ct-blue);\r\n  background: var(--ct-blue-soft);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-warning {\r\n  border: 1px solid #ead5a8;\r\n  border-left: 4px solid var(--ct-warning-border);\r\n  background: var(--ct-warning-bg);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-note {\r\n  border: 1px solid #cfe3d6;\r\n  border-left: 4px solid var(--ct-success-border);\r\n  background: var(--ct-success-bg);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-callout p:last-child,\r\n#leeyee-closed-transition-ats-guide .ct-warning p:last-child,\r\n#leeyee-closed-transition-ats-guide .ct-note p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-label {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: var(--ct-blue);\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n  letter-spacing: .055em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-warning .ct-label {\r\n  color: #996400;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-note .ct-label {\r\n  color: #336e49;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow {\r\n  margin: 22px 0 28px;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: ctstep;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow li {\r\n  position: relative;\r\n  margin: 0 0 0 18px;\r\n  padding: 0 0 25px 42px;\r\n  counter-increment: ctstep;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow li::before {\r\n  content: counter(ctstep);\r\n  position: absolute;\r\n  top: -1px;\r\n  left: 0;\r\n  width: 28px;\r\n  height: 28px;\r\n  display: grid;\r\n  place-items: center;\r\n  border-radius: 50%;\r\n  background: var(--ct-blue);\r\n  color: #fff;\r\n  font-size: 13px;\r\n  font-weight: 800;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow li:not(:last-child)::after {\r\n  content: \"\";\r\n  position: absolute;\r\n  top: 29px;\r\n  left: 13px;\r\n  width: 2px;\r\n  height: calc(100% - 25px);\r\n  background: #cbd9e5;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow li:last-child {\r\n  padding-bottom: 0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow b {\r\n  display: block;\r\n  margin-bottom: 3px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-flow span {\r\n  color: #53616e;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-table-intro {\r\n  margin-bottom: 10px;\r\n  color: var(--ct-muted);\r\n  font-size: 14px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-table-wrap {\r\n  margin: 20px 0 30px;\r\n  border: 1px solid var(--ct-border);\r\n  border-radius: 10px;\r\n  overflow: hidden;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide table {\r\n  width: 100%;\r\n  border-collapse: collapse;\r\n  table-layout: fixed;\r\n  margin: 0;\r\n  font-size: 14.5px;\r\n  line-height: 1.5;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide thead th {\r\n  padding: 13px 14px;\r\n  background: var(--ct-blue);\r\n  color: #fff;\r\n  border-right: 1px solid rgba(255,255,255,.2);\r\n  font-weight: 700;\r\n  text-align: left;\r\n  vertical-align: top;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide thead th:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide tbody td {\r\n  padding: 13px 14px;\r\n  border-top: 1px solid #e5ebf0;\r\n  border-right: 1px solid #e5ebf0;\r\n  vertical-align: top;\r\n  color: #344454;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide tbody td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide tbody tr:nth-child(even) td {\r\n  background: #fafcfe;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-table-conclusion {\r\n  margin-top: -16px;\r\n  margin-bottom: 32px;\r\n  color: #3d4e5e;\r\n  font-size: 14.5px;\r\n  font-weight: 600;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-list,\r\n#leeyee-closed-transition-ats-guide .ct-checklist {\r\n  margin: 14px 0 25px;\r\n  padding-left: 22px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-list li,\r\n#leeyee-closed-transition-ats-guide .ct-checklist li {\r\n  margin: 8px 0;\r\n  padding-left: 4px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-checklist {\r\n  columns: 2;\r\n  column-gap: 42px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-checklist li {\r\n  break-inside: avoid;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scenarios {\r\n  display: grid;\r\n  grid-template-columns: 1fr 1fr;\r\n  gap: 18px 24px;\r\n  margin: 22px 0 30px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scenario {\r\n  padding-top: 16px;\r\n  border-top: 3px solid #d4e2ee;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scenario h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 20px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-scenario p {\r\n  margin-bottom: 0;\r\n  color: #4c5c69;\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-standard-update {\r\n  margin: 24px 0 30px;\r\n  padding: 23px 24px;\r\n  border: 1px solid var(--ct-border-strong);\r\n  border-radius: 11px;\r\n  background: var(--ct-blue-soft);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-standard-update strong {\r\n  color: var(--ct-blue);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-check-panel {\r\n  margin: 28px 0 32px;\r\n  padding: 25px 27px;\r\n  border: 1px solid #cad8e5;\r\n  border-radius: 12px;\r\n  background: #fbfdff;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-check-panel h3 {\r\n  margin: 0 0 14px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-main-cta {\r\n  margin: 34px 0 44px;\r\n  padding: 28px 30px;\r\n  border: 1px solid var(--ct-border-strong);\r\n  border-radius: 13px;\r\n  background: var(--ct-blue-soft);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-main-cta h3 {\r\n  margin: 0 0 10px;\r\n  color: #15314b;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-main-cta p {\r\n  max-width: 690px;\r\n  margin-bottom: 20px;\r\n  color: #415363;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq {\r\n  margin-top: 16px;\r\n  border-top: 1px solid var(--ct-border);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq details {\r\n  border-bottom: 1px solid var(--ct-border);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq summary {\r\n  position: relative;\r\n  padding: 19px 42px 19px 2px;\r\n  color: #1f3040;\r\n  font-weight: 700;\r\n  line-height: 1.45;\r\n  cursor: pointer;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq summary::after {\r\n  content: \"+\";\r\n  position: absolute;\r\n  top: 17px;\r\n  right: 7px;\r\n  color: var(--ct-blue);\r\n  font-size: 24px;\r\n  line-height: 1;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq details[open] summary::after {\r\n  content: \"\u2212\";\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-faq .ct-faq-answer {\r\n  padding: 0 36px 18px 2px;\r\n  color: #4a5966;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-related {\r\n  margin: 34px 0 0;\r\n  padding-top: 22px;\r\n  border-top: 1px solid var(--ct-border);\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-related h3 {\r\n  margin: 0 0 10px;\r\n  font-size: 20px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-references {\r\n  margin-top: 48px;\r\n  padding-top: 8px;\r\n  border-top: 2px solid #dfe7ee;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-references ol {\r\n  margin: 0;\r\n  padding-left: 23px;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide .ct-references li {\r\n  margin: 0 0 13px;\r\n  padding-left: 5px;\r\n  color: #4b5b68;\r\n  font-size: 13.5px;\r\n  line-height: 1.6;\r\n}\r\n\r\n#leeyee-closed-transition-ats-guide sup a {\r\n  font-size: 11px;\r\n  font-weight: 700;\r\n  text-decoration: none;\r\n}\r\n\r\n@media (max-width: 820px) {\r\n  #leeyee-closed-transition-ats-guide {\r\n    padding-left: 20px;\r\n    padding-right: 20px;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide .ct-keyline {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide .ct-scope-grid,\r\n  #leeyee-closed-transition-ats-guide .ct-scenarios {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide .ct-checklist {\r\n    columns: 1;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  #leeyee-closed-transition-ats-guide {\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n    padding-bottom: 45px;\r\n    font-size: 16px;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide .ct-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide h2 {\r\n    margin-top: 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#leeyee-closed-transition-ats-guide thead {\r\n    position: absolute;\r\n    width: 1px;\r\n    height: 1px;\r\n    margin: -1px;\r\n    padding: 0;\r\n    overflow: hidden;\r\n    clip: rect(0,0,0,0);\r\n    white-space: nowrap;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide tbody tr {\r\n    margin-bottom: 13px;\r\n    border: 1px solid var(--ct-border);\r\n    border-radius: 9px;\r\n    overflow: hidden;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide tbody td,\r\n  #leeyee-closed-transition-ats-guide tbody tr:nth-child(even) td {\r\n    display: grid;\r\n    grid-template-columns: minmax(105px,39%) 1fr;\r\n    gap: 11px;\r\n    padding: 11px 12px;\r\n    border-right: 0;\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide tbody td::before {\r\n    content: attr(data-label);\r\n    color: var(--ct-blue);\r\n    font-size: 12px;\r\n    font-weight: 800;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide .ct-table-conclusion {\r\n    margin-top: 0;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  #leeyee-closed-transition-ats-guide {\r\n    padding-left: 14px;\r\n    padding-right: 14px;\r\n  }\r\n\r\n  #leeyee-closed-transition-ats-guide tbody td,\r\n  #leeyee-closed-transition-ats-guide tbody tr:nth-child(even) td {\r\n    grid-template-columns: 1fr;\r\n    gap: 4px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-closed-transition-ats-guide\">\r\n\r\n  <div class=\"ct-intro\">\r\n    <span class=\"ct-eyebrow\">Critical Power Application Guide<\/span>\r\n    <p>A <strong>closed transition ATS<\/strong>, also called a closed transition transfer switch or CTTS, uses a controlled <strong>make-before-break<\/strong> sequence. When two power sources are available and suitably synchronized, the incoming source closes before the outgoing source opens, creating a brief period of source overlap.<\/p>\r\n    <p>The important purchasing question is not whether closed transition sounds more advanced. It is whether the project actually needs momentary source paralleling. Many compact backup-power applications are better served by a conventional ATS that keeps the two sources separated.<\/p>\r\n  <\/div>\r\n\r\n  <section class=\"ct-quick\" aria-labelledby=\"ct-quick-answer\">\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\/closed-transition-ats\/#quick-answer-what-is-a-closed-transition-ats\" >Quick Answer: What Is a Closed Transition ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/closed-transition-ats\/#is-the-leeyee-ats-63-a-closed-transition-ats\" >Is the LEEYEE ATS-63 a Closed Transition ATS?<\/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\/closed-transition-ats\/#how-does-a-closed-transition-ats-work\" >How Does a Closed Transition ATS Work?<\/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\/closed-transition-ats\/#does-closed-transition-mean-zero-interruption\" >Does Closed Transition Mean Zero Interruption?<\/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\/closed-transition-ats\/#why-must-the-two-sources-be-synchronized\" >Why Must the Two Sources Be Synchronized?<\/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\/closed-transition-ats\/#what-happens-during-a-real-utility-failure\" >What Happens During a Real Utility Failure?<\/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\/closed-transition-ats\/#open-transition-vs-closed-transition-ats\" >Open Transition vs Closed Transition ATS<\/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\/closed-transition-ats\/#when-is-the-leeyee-ats-63-the-better-fit\" >When Is the LEEYEE ATS-63 the Better Fit?<\/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\/closed-transition-ats\/#closed-transition-is-not-the-same-as-soft-load-transfer\" >Closed Transition Is Not the Same as Soft-Load Transfer<\/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\/closed-transition-ats\/#why-do-utility-and-protection-requirements-matter\" >Why Do Utility and Protection Requirements Matter?<\/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\/closed-transition-ats\/#do-hospitals-and-data-centers-always-need-closed-transition\" >Do Hospitals and Data Centers Always Need Closed Transition?<\/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\/closed-transition-ats\/#does-a-normal-generator-backup-project-need-closed-transition\" >Does a Normal Generator Backup Project Need Closed Transition?<\/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\/closed-transition-ats\/#when-should-you-use-a-closed-transition-ats\" >When Should You Use a Closed Transition ATS?<\/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\/de\/closed-transition-ats\/#what-does-iec-60947-6-1-2026-say-about-closed-transition-atse\" >What Does IEC 60947-6-1:2026 Say About Closed-Transition ATSE?<\/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\/de\/closed-transition-ats\/#what-should-you-confirm-before-choosing-the-ats\" >What Should You Confirm Before Choosing the ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/closed-transition-ats\/#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-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/closed-transition-ats\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"ct-quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-what-is-a-closed-transition-ats\"><\/span>Quick Answer: What Is a Closed Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>A closed transition ATS transfers the load between <strong>two acceptable sources without intentionally opening the load circuit between them<\/strong>. The incoming source is connected first and the outgoing source is disconnected immediately afterward. Eaton and Schneider Electric describe this as make-before-break operation.<sup><a href=\"#ct-ref-2\">[2]<\/a><\/sup><sup><a href=\"#ct-ref-5\">[5]<\/a><\/sup><\/p>\r\n\r\n    <p>Closed transition is mainly useful when both sources are already healthy\u2014for example during planned transfer, generator testing or retransfer to utility. If utility power has already failed, there is no healthy normal source available for make-before-break overlap. Cummins therefore notes that a closed-transition system operates as an open transition when one source is unavailable.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ct-keyline\">\r\n      <div class=\"ct-keyline-item\">\r\n        <b>Transfer logic<\/b>\r\n        <span>Make before break<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-keyline-item\">\r\n        <b>Required condition<\/b>\r\n        <span>Two acceptable, synchronizable sources<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-keyline-item\">\r\n        <b>Main value<\/b>\r\n        <span>Avoid a planned open-transfer gap<\/span>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ct-product-scope\" aria-labelledby=\"ct-leeyee-product-scope\">\r\n    <span class=\"ct-scope-badge\">LEEYEE Product Scope<\/span>\r\n\r\n    <h2 id=\"ct-leeyee-product-scope\"><span class=\"ez-toc-section\" id=\"is-the-leeyee-ats-63-a-closed-transition-ats\"><\/span>Is the LEEYEE ATS-63 a Closed Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p><strong>The current published ATS-63 product information should not be interpreted as closed-transition capability.<\/strong><\/p>\r\n\r\n    <p>LEEYEE ATS-63 is a compact DIN-rail automatic transfer switch for general backup source switching. The published series includes 2P and 4P versions, rated-current options from 6A to 63A and applications such as generator backup, inverter backup, distribution boards and control cabinets.<sup><a href=\"#ct-ref-8\">[8]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ct-scope-grid\">\r\n      <div class=\"ct-scope-item\">\r\n        <b>Product type<\/b>\r\n        <span>Compact automatic transfer switch<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scope-item\">\r\n        <b>Available poles<\/b>\r\n        <span>2P \/ 4P<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scope-item\">\r\n        <b>Published current range<\/b>\r\n        <span>6A\u201363A<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scope-item\">\r\n        <b>Installation<\/b>\r\n        <span>DIN rail<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scope-item\">\r\n        <b>Typical application<\/b>\r\n        <span>General backup source switching<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scope-item\">\r\n        <b>Published switching time<\/b>\r\n        <span>&lt;50 ms<\/span>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"ct-warning\">\r\n      <span class=\"ct-label\">Important product boundary<\/span>\r\n      <p>The published <strong>&lt;50 ms transfer switching time does not mean zero interruption and does not prove closed-transition operation<\/strong>. Current LEEYEE guidance states that compact DIN-rail ATS products should not automatically be assumed to support source synchronization or closed transition. If a project specifically requires momentary paralleling or no-break planned transfer, that requirement needs a different engineered solution unless a model-specific document explicitly confirms closed-transition capability.<sup><a href=\"#ct-ref-8\">[8]<\/a><\/sup><\/p>\r\n    <\/div>\r\n\r\n    <p><strong>Buyer meaning:<\/strong> for a normal generator, inverter or dual-source backup panel, ATS-63 may be appropriate when voltage, current, poles, wiring and switching requirements match. If the specification explicitly says <em>closed transition<\/em>, <em>make-before-break<\/em>, <em>source synchronization<\/em> or <em>momentary paralleling<\/em>, do not substitute ATS-63 without written model-specific confirmation.<\/p>\r\n  <\/section>\r\n\r\n  <div class=\"ct-light-cta\">\r\n    <p>Not sure whether your project needs a compact ATS-63 or a closed-transition system? Send the two source types, voltage, current, poles and required transfer behaviour for technical review.<\/p>\r\n\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Confirm ATS Transition Requirement\">\r\n      <span class=\"w-btn-label\">Confirm ATS Transition Requirement<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"how-does-a-closed-transition-ats-work\"><\/span>How Does a Closed Transition ATS Work?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>The defining difference is the order in which the contacts operate. A conventional open-transition ATS disconnects one source before connecting the next. A closed-transition system temporarily reverses that order.<\/p>\r\n\r\n    <ol class=\"ct-flow\">\r\n      <li>\r\n        <b>Source A is carrying the load.<\/b>\r\n        <span>Source B is available but not yet connected.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <b>The controller verifies Source B and the relationship between both sources.<\/b>\r\n        <span>Voltage, frequency and synchronization conditions are checked according to the equipment design and project settings.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <b>The incoming source closes.<\/b>\r\n        <span>Both sources are briefly connected to the load bus.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <b>The outgoing source opens.<\/b>\r\n        <span>The momentary parallel condition ends.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <b>The load remains on Source B.<\/b>\r\n        <span>The closed-transition sequence is complete.<\/span>\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <div class=\"ct-callout\">\r\n      <span class=\"ct-label\">Engineering meaning<\/span>\r\n      <p>The critical event is the <strong>momentary source overlap<\/strong>. Because two live power sources are electrically connected together, closed transition requires synchronization and protection functions that should not be assumed to exist in a compact general-purpose ATS.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"ct-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/closed-transition-ats-make-before-break-sequence.webp\"\r\n      alt=\"Closed transition ATS make-before-break sequence showing momentary paralleling of two synchronized power sources\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>Closed transition sequence: the incoming source connects before the outgoing source opens, creating a controlled momentary overlap.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"does-closed-transition-mean-zero-interruption\"><\/span>Does Closed Transition Mean Zero Interruption?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Closed transition avoids the <strong>intentional open-circuit interval<\/strong> that occurs when an open-transition switch separates one healthy source before connecting another.<\/p>\r\n\r\n    <p>That does not mean every downstream load experiences a mathematically perfect voltage and frequency waveform throughout the transfer.<\/p>\r\n\r\n    <p>Generator loading can change rapidly. Cummins explains that fast closed transfer may still produce generator voltage or frequency disturbance because the generator requires time to respond to a sudden change in load.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ct-warning\">\r\n      <span class=\"ct-label\">Do not confuse switching time with closed transition<\/span>\r\n      <p>A specification such as <strong>\u201ctransfer switching time &lt;50 ms\u201d<\/strong> does not by itself describe a closed-transition ATS. A fast break-before-make ATS can still interrupt the load briefly. Closed transition is defined by the make-before-break contact sequence and controlled source overlap\u2014not simply by a small millisecond value.<\/p>\r\n    <\/div>\r\n\r\n    <h3>How long can the two sources overlap?<\/h3>\r\n\r\n    <p>Some commercial fast closed-transition designs limit source paralleling to approximately 100 ms or less. Schneider Electric documents a sub-100 ms sequence for the referenced ASCO closed-transition design.<sup><a href=\"#ct-ref-2\">[2]<\/a><\/sup><\/p>\r\n\r\n    <p>This should not be treated as a universal value. The acceptable overlap time depends on equipment design, controller logic, certification, utility requirements and project protection philosophy.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"why-must-the-two-sources-be-synchronized\"><\/span>Why Must the Two Sources Be Synchronized?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Closed transition connects two live AC sources together. The sources therefore need to be sufficiently aligned before the contacts are allowed to overlap.<\/p>\r\n\r\n    <p>Typical synchronizing logic evaluates:<\/p>\r\n\r\n    <ul class=\"ct-list\">\r\n      <li>voltage difference;<\/li>\r\n      <li>frequency difference;<\/li>\r\n      <li>phase relationship.<\/li>\r\n    <\/ul>\r\n\r\n    <p>The exact permitted window depends on the selected transfer-switch controller and project requirements.<sup><a href=\"#ct-ref-3\">[3]<\/a><\/sup><sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n  <\/section>\r\n\r\n  <figure class=\"ct-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/closed-transition-ats-synchronization-conditions.webp\"\r\n      alt=\"Closed transition ATS synchronization conditions for voltage frequency and phase relationship before source paralleling\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>Closed-transition controllers verify acceptable voltage, frequency and phase relationship before permitting source overlap.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <section class=\"ct-section\">\r\n    <div class=\"ct-note\">\r\n      <span class=\"ct-label\">Manufacturer-specific example<\/span>\r\n      <p>Schneider Electric documents an in-sync window for certain ASCO closed-transition products of less than \u00b15 electrical degrees phase difference, less than \u00b10.2 Hz frequency difference and less than 5% voltage difference. These are <strong>product-specific values<\/strong>, not universal settings for every CTTS.<sup><a href=\"#ct-ref-3\">[3]<\/a><\/sup><\/p>\r\n    <\/div>\r\n\r\n    <p><strong>Buyer meaning:<\/strong> a closed-transition RFQ should ask for the controller's synchronization method and limits. Current rating and transfer speed alone do not establish closed-transition capability.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"what-happens-during-a-real-utility-failure\"><\/span>What Happens During a Real Utility Failure?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Closed transition needs two acceptable sources before make-before-break operation is possible.<\/p>\r\n\r\n    <p>If utility power suddenly fails, the normal source is already unavailable. A conventional utility-generator backup sequence therefore looks different:<\/p>\r\n\r\n    <ol class=\"ct-flow\">\r\n      <li>\r\n        <b>Utility power becomes unacceptable.<\/b>\r\n        <span>The failed source cannot participate in controlled overlap.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <b>The generator receives a start command.<\/b>\r\n        <span>The generator needs time to start and establish acceptable voltage and frequency.<\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <b>The alternate source becomes acceptable.<\/b>\r\n        <span>The ATS can then transfer the load.<\/span>\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <p>Cummins states that closed-transition equipment operates in open transition when one source has failed.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n\r\n    <div class=\"ct-warning\">\r\n      <span class=\"ct-label\">ATS is not a UPS<\/span>\r\n      <p>A closed-transition ATS cannot provide energy while a generator is starting. If the connected equipment cannot tolerate this interval, a UPS or other ride-through architecture may still be required.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n    <\/div>\r\n\r\n    <p>This is why closed transition is especially valuable during <strong>planned generator testing or retransfer back to utility<\/strong>, when both sources can already be available.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"open-transition-vs-closed-transition-ats\"><\/span>Open Transition vs Closed Transition ATS<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p class=\"ct-table-intro\">For procurement, focus on source behaviour rather than assuming the more complex transition method is automatically better.<\/p>\r\n\r\n    <div class=\"ct-table-wrap\">\r\n      <table aria-label=\"Open transition versus closed transition ATS comparison\">\r\n        <thead>\r\n          <tr>\r\n            <th style=\"width:30%;\">Decision Point<\/th>\r\n            <th style=\"width:35%;\">Open Transition<\/th>\r\n            <th style=\"width:35%;\">Closed Transition<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Switching sequence<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">Break before make<\/td>\r\n            <td data-label=\"Closed Transition\">Make before break<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Source overlap<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">No<\/td>\r\n            <td data-label=\"Closed Transition\">Brief controlled overlap<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Planned-transfer interruption<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">A short interruption occurs<\/td>\r\n            <td data-label=\"Closed Transition\">Intentional open gap is avoided<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Synchronization for overlap<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">Not applicable because sources are kept separated<\/td>\r\n            <td data-label=\"Closed Transition\">Required<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Source paralleling<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">No intentional paralleling<\/td>\r\n            <td data-label=\"Closed Transition\">Momentary paralleling<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Control complexity<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">Lower<\/td>\r\n            <td data-label=\"Closed Transition\">Higher<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>Typical compact ATS application<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">General generator, inverter and dual-source backup<\/td>\r\n            <td data-label=\"Closed Transition\">Engineered systems requiring no-break planned transfer<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Decision Point\"><strong>LEEYEE ATS-63<\/strong><\/td>\r\n            <td data-label=\"Open Transition\">Suitable for general backup switching when system parameters match<\/td>\r\n            <td data-label=\"Closed Transition\">Do not specify as CTTS based on current published product information<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"ct-table-conclusion\">For the current LEEYEE compact ATS-63 range, treat the product as a general backup transfer solution rather than assuming closed-transition capability.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"when-is-the-leeyee-ats-63-the-better-fit\"><\/span>When Is the LEEYEE ATS-63 the Better Fit?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>The ATS-63 is more relevant when the project needs a compact automatic transfer between two AC sources and can tolerate the brief interruption associated with conventional source switching.<\/p>\r\n\r\n    <div class=\"ct-scenarios\">\r\n      <div class=\"ct-scenario\">\r\n        <h3>Generator Backup<\/h3>\r\n        <p>For switching between utility and generator in compact backup systems, provided voltage, current, poles, wiring and generator-control requirements match the selected ATS.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scenario\">\r\n        <h3>Inverter Backup<\/h3>\r\n        <p>For grid-to-inverter switching where the inverter output, frequency, neutral arrangement and project wiring are compatible.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scenario\">\r\n        <h3>Control Cabinets<\/h3>\r\n        <p>Its compact DIN-rail format can suit auxiliary and backup circuits in control panels where source synchronization is not required.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scenario\">\r\n        <h3>Small Distribution Systems<\/h3>\r\n        <p>The 2P and 4P options support different source and conductor arrangements, subject to the exact project wiring design.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"ct-callout\">\r\n      <span class=\"ct-label\">Do not use ATS-63 as a substitute when<\/span>\r\n      <p>The specification requires <strong>closed transition, synchronized source paralleling, zero-break planned transfer, soft-load transfer or another engineered critical-power function<\/strong> that is not confirmed in the ATS-63 model documentation.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"closed-transition-is-not-the-same-as-soft-load-transfer\"><\/span>Closed Transition Is Not the Same as Soft-Load Transfer<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Fast closed transition and soft-load transfer can both involve source paralleling, but they solve different engineering problems.<\/p>\r\n\r\n    <p>A fast closed-transition ATS can move load rapidly once synchronization conditions are satisfied. A generator can therefore see a relatively abrupt change in load.<\/p>\r\n\r\n    <p>Cummins describes soft-load transfer as a more controlled arrangement in which synchronization and generator governing are used while load is gradually ramped from one source to the other.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n\r\n    <p>If a project specification mentions load ramping, extended paralleling or generator kW control, do not assume a conventional closed-transition ATS\u2014or a compact ATS-63\u2014is sufficient.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"why-do-utility-and-protection-requirements-matter\"><\/span>Why Do Utility and Protection Requirements Matter?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>A utility-generator closed transition briefly connects the generator and utility together. Even when the intended overlap is short, the project may need to address utility interconnection rules, protection and failure-to-disconnect conditions.<\/p>\r\n\r\n    <p>Cummins notes that serving-utility requirements vary and additional protective controls may be required for closed-transition applications.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n\r\n    <ul class=\"ct-list\">\r\n      <li>Is momentary utility paralleling permitted?<\/li>\r\n      <li>What synchronization window is required?<\/li>\r\n      <li>What happens if the outgoing source fails to disconnect?<\/li>\r\n      <li>What protection is required during the parallel interval?<\/li>\r\n      <li>What fault-current contribution exists with both sources connected?<\/li>\r\n      <li>What utility, AHJ or project approval is required?<\/li>\r\n    <\/ul>\r\n\r\n    <p>These conditions are project-specific and should be confirmed by the qualified system designer and serving utility where applicable.<\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"do-hospitals-and-data-centers-always-need-closed-transition\"><\/span>Do Hospitals and Data Centers Always Need Closed Transition?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p><strong>No.<\/strong> The name of the facility does not determine the ATS transition method.<\/p>\r\n\r\n    <div class=\"ct-scenarios\">\r\n      <div class=\"ct-scenario\">\r\n        <h3>Hospitals<\/h3>\r\n        <p>Closed transition may help where planned testing or retransfer should avoid a power blink, but healthcare electrical requirements and the complete emergency-power system still govern the design.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scenario\">\r\n        <h3>Data Centers<\/h3>\r\n        <p>A data center may already use UPS systems, redundant buses, static transfer equipment and other continuity architecture. CTTS should be evaluated as one part of the complete power path.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scenario\">\r\n        <h3>Industrial Processes<\/h3>\r\n        <p>Continuous production can justify closed transition if a brief planned interruption would trip the process, but generator load response must also be considered.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ct-scenario\">\r\n        <h3>General Backup Power<\/h3>\r\n        <p>If a brief interruption is acceptable, a simpler open-transition ATS is often more appropriate and easier to coordinate.<\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"does-a-normal-generator-backup-project-need-closed-transition\"><\/span>Does a Normal Generator Backup Project Need Closed Transition?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>Often, it does not.<\/p>\r\n\r\n    <p>If the requirement is simply:<\/p>\r\n\r\n    <p><strong>utility fails \u2192 generator starts \u2192 backup source becomes acceptable \u2192 ATS transfers the load<\/strong><\/p>\r\n\r\n    <p>then closed transition cannot eliminate generator starting time because the utility source has already failed.<\/p>\r\n\r\n    <p>Closed transition becomes more relevant when the system needs to avoid an intentional interruption during:<\/p>\r\n\r\n    <ul class=\"ct-list\">\r\n      <li>planned generator testing;<\/li>\r\n      <li>planned transfer between healthy sources;<\/li>\r\n      <li>retransfer from generator back to restored utility;<\/li>\r\n      <li>continuous-process source changeover.<\/li>\r\n    <\/ul>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"when-should-you-use-a-closed-transition-ats\"><\/span>When Should You Use a Closed Transition ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ct-table-wrap\">\r\n      <table aria-label=\"Closed transition ATS project decision guide\">\r\n        <thead>\r\n          <tr>\r\n            <th style=\"width:48%;\">Project Condition<\/th>\r\n            <th style=\"width:52%;\">Engineering Direction<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Short planned interruption is acceptable<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">A conventional ATS may be sufficient.<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Generator testing must avoid a power blink<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">Evaluate closed transition.<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Retransfer to utility should avoid an intentional open gap<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">Common closed-transition use case.<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Sources cannot synchronize reliably<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">Normal closed transition should not proceed.<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Utility paralleling is prohibited<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">Use another approved transfer strategy.<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Load must remain powered while generator starts<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">ATS alone is not enough; evaluate UPS or other ride-through.<\/td>\r\n          <\/tr>\r\n\r\n          <tr>\r\n            <td data-label=\"Project Condition\"><strong>Compact 2P\/4P backup switching up to 63A is required<\/strong><\/td>\r\n            <td data-label=\"Engineering Direction\">Evaluate LEEYEE ATS-63 if its electrical and wiring parameters match.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure class=\"ct-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/do-you-need-closed-transition-ats-decision-flow.webp\"\r\n      alt=\"Decision flow for choosing closed transition ATS for critical power generator and planned transfer applications\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <figcaption>Use the actual interruption requirement, synchronization capability and source arrangement to decide whether closed transition is necessary.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"what-does-iec-60947-6-1-2026-say-about-closed-transition-atse\"><\/span>What Does IEC 60947-6-1:2026 Say About Closed-Transition ATSE?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ct-standard-update\">\r\n      <p><strong>IEC 60947-6-1:2026<\/strong> is the fourth edition of the IEC transfer switching equipment standard. It was published on April 2, 2026 and includes dedicated requirements for <strong>ATSE having closed transition capability<\/strong> in Annex D.<sup><a href=\"#ct-ref-1\">[1]<\/a><\/sup><\/p>\r\n    <\/div>\r\n\r\n    <p>This does not mean every ATS claiming IEC 60947-6-1 automatically has closed-transition capability.<\/p>\r\n\r\n    <p>For procurement, verify:<\/p>\r\n\r\n    <ul class=\"ct-list\">\r\n      <li>the exact product model;<\/li>\r\n      <li>the standard edition;<\/li>\r\n      <li>the certificate or test-report scope;<\/li>\r\n      <li>whether closed-transition capability is actually included;<\/li>\r\n      <li>the destination-market requirements.<\/li>\r\n    <\/ul>\r\n\r\n    <p>For North American projects, UL 1008 is also a relevant transfer-switch standard. Project-specific NEC, NFPA and AHJ requirements must be confirmed separately.<sup><a href=\"#ct-ref-6\">[6]<\/a><\/sup><\/p>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\r\n    <h2><span class=\"ez-toc-section\" id=\"what-should-you-confirm-before-choosing-the-ats\"><\/span>What Should You Confirm Before Choosing the ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ct-check-panel\">\r\n      <h3>Project and RFQ Checklist<\/h3>\r\n\r\n      <ul class=\"ct-checklist\">\r\n        <li>Normal source type<\/li>\r\n        <li>Alternate source type<\/li>\r\n        <li>System voltage<\/li>\r\n        <li>Frequency<\/li>\r\n        <li>Single-phase or three-phase<\/li>\r\n        <li>Required pole configuration<\/li>\r\n        <li>Continuous load current<\/li>\r\n        <li>Available fault current<\/li>\r\n        <li>Generator starting characteristics<\/li>\r\n        <li>Load sensitivity to interruption<\/li>\r\n        <li>Required transfer method<\/li>\r\n        <li>Required transfer time<\/li>\r\n        <li>Need for source synchronization<\/li>\r\n        <li>Need for momentary paralleling<\/li>\r\n        <li>UPS or ride-through already installed<\/li>\r\n        <li>Utility interconnection requirement<\/li>\r\n        <li>Applicable standard<\/li>\r\n        <li>Required certificate scope<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ct-main-cta\">\r\n      <h3>Not Sure Whether ATS-63 or Another Transfer Solution Fits?<\/h3>\r\n\r\n      <p>Share your voltage, current, poles, normal source, backup source, load type and required transfer behaviour. LEEYEE can help confirm whether the project matches the compact ATS-63 range or requires a different engineered transfer approach.<\/p>\r\n\r\n      <button type=\"button\"\r\n              class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n              aria-label=\"Request ATS Selection Review\">\r\n        <span class=\"w-btn-label\">Request ATS Selection Review<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section\">\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=\"ct-faq\">\r\n\r\n      <details>\r\n        <summary>What is a closed transition ATS?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>A closed transition ATS uses make-before-break operation. It briefly connects two acceptable synchronized sources before disconnecting the outgoing source.<sup><a href=\"#ct-ref-2\">[2]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Is the LEEYEE ATS-63 a closed transition ATS?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>Current published LEEYEE ATS-63 information describes it as a compact DIN-rail automatic transfer switch for general backup source switching and does not establish closed-transition synchronization or momentary paralleling capability. Do not specify ATS-63 as CTTS without model-specific documentation confirming that function.<sup><a href=\"#ct-ref-8\">[8]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Does the ATS-63 switching time of less than 50 ms mean zero interruption?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>No. The published value is the ATS switching time. It does not mean a generator starts within 50 ms, and it does not by itself mean make-before-break or zero-break transfer.<sup><a href=\"#ct-ref-8\">[8]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Can ATS-63 be used for generator backup?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>Yes, when the system voltage, current, pole configuration, wiring and generator interface match the product requirements. It should be treated as a compact backup transfer application rather than assumed to provide closed-transition paralleling.<sup><a href=\"#ct-ref-8\">[8]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Does a closed transition ATS replace a UPS?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>No. An ATS transfers a load between sources but does not store energy. A UPS or other ride-through system may still be needed while a generator starts or whenever no acceptable source is available.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Why must the two sources be synchronized?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>Because closed transition briefly connects both live sources. Voltage, frequency and phase relationship therefore need to fall inside the permitted synchronization window before overlap is allowed.<sup><a href=\"#ct-ref-3\">[3]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Can closed transition remove generator starting time?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>No. If utility power has already failed, the generator must still start and reach acceptable conditions before it can supply the load. Closed transition does not provide stored energy during this period.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Does closed transition require utility approval?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>Where utility and generator are momentarily paralleled, the serving utility's interconnection and protection requirements should be confirmed. Requirements vary by location and system design.<sup><a href=\"#ct-ref-4\">[4]<\/a><\/sup><\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n      <details>\r\n        <summary>Is closed transition mandatory for hospitals or data centers?<\/summary>\r\n        <div class=\"ct-faq-answer\">\r\n          <p>No universal decision should be based only on facility type. The required transfer method depends on load continuity, UPS architecture, project specification, applicable codes and the complete power system.<\/p>\r\n        <\/div>\r\n      <\/details>\r\n\r\n    <\/div>\r\n\r\n    <div class=\"ct-related\">\r\n      <h3>Related Reading<\/h3>\r\n      <p>For the compact LEEYEE ATS-63 range and general ATS selection, read <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose<\/a>.<\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"ct-section ct-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=\"ct-ref-1\">\r\n        International Electrotechnical Commission. <strong>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment.<\/strong>\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=\"ct-ref-2\">\r\n        Schneider Electric \/ ASCO. <strong>What are the different ASCO ATS transition modes?<\/strong>\r\n        <a href=\"https:\/\/www.se.com\/sg\/en\/faqs\/FAQ000219583\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric technical guidance<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ct-ref-3\">\r\n        Schneider Electric \/ ASCO. <strong>What is the difference between in-sync and in-phase of ASCO transfer switches?<\/strong>\r\n        <a href=\"https:\/\/www.se.com\/sg\/en\/faqs\/FAQ000196074\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric technical guidance<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ct-ref-4\">\r\n        Cummins Power Generation. <strong>T-011 Transfer Switch Application Manual.<\/strong> Technical guidance covering closed transition, utility coordination, synchronizing, source availability and soft-load transfer.\r\n        <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2024-08\/t011-Transfer-switch-application-manual.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Official Cummins manual<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ct-ref-5\">\r\n        Eaton. <strong>Automatic Transfer Switch Fundamentals.<\/strong> Describes open transition as break-before-make and closed transition as make-before-break.\r\n        <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Official Eaton technical page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ct-ref-6\">\r\n        UL Solutions. <strong>Switch Certification and Evaluation Services.<\/strong> Identifies UL 1008 for applicable automatic transfer switch equipment.\r\n        <a href=\"https:\/\/www.ul.com\/services\/switch-certification-and-evaluation-services\" target=\"_blank\" rel=\"noopener noreferrer\">Official UL Solutions page<\/a>.\r\n      <\/li>\r\n\r\n      <li id=\"ct-ref-8\">\r\n        LEEYEE. <strong>What Is an Automatic Transfer Switch? How ATS Works &amp; How to Choose.<\/strong> Published LEEYEE information covering ATS-63 product scope, 2P\/4P configurations, 6A\u201363A current options, transfer switching time and compact backup applications.\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<\/article>\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>Critical Power Application GuideA closed transition ATS, also called a closed transition transfer switch or CTTS, uses a controlled make-before-break sequence. When two power sources are available and suitably synchronized, the incoming source closes before the outgoing source opens, creating a brief period of source overlap. The important purchasing question is not whether closed transition&#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-31208","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>Closed Transition ATS: Make-Before-Break &amp; When You Need It<\/title>\n<meta name=\"description\" content=\"Learn how closed transition ATS works, when make-before-break transfer is required, and when a compact LEEYEE ATS-63 is the more appropriate backup switching solution.\" \/>\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\/de\/closed-transition-ats\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Closed Transition ATS: Make-Before-Break &amp; When You Need It\" \/>\n<meta property=\"og:description\" content=\"Learn how closed transition ATS works, when make-before-break transfer is required, and when a compact LEEYEE ATS-63 is the more appropriate backup switching solution.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/de\/closed-transition-ats\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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