{"id":31366,"date":"2026-09-29T08:55:03","date_gmt":"2026-09-29T00:55:03","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31366"},"modified":"2026-09-29T10:00:56","modified_gmt":"2026-09-29T02:00:56","slug":"data-center-automatic-transfer-switch-selection-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/id\/data-center-automatic-transfer-switch\/","title":{"rendered":"Data Center Automatic Transfer Switch Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31366\" class=\"elementor elementor-31366\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ed66410 e-flex e-con-boxed e-con e-parent\" data-id=\"ed66410\" 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-68c4008 elementor-widget elementor-widget-html\" data-id=\"68c4008\" 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\/* =========================================================\r\n   LEEYEE \u2014 Data Center Automatic Transfer Switch Guide\r\n   WordPress Custom HTML\r\n   Scoped page CSS \/ No H1 \/ No Hero \/ No navigation\r\n   ========================================================= *\/\r\n\r\n.leeyee-dc-ats-guide,\r\n.leeyee-dc-ats-guide * {\r\n  box-sizing: border-box;\r\n}\r\n\r\n.leeyee-dc-ats-guide {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00366f;\r\n  --ly-blue-pale: #f7fbff;\r\n  --ly-blue-soft: #eef5ff;\r\n  --ly-text: #283845;\r\n  --ly-heading: #172b3a;\r\n  --ly-muted: #61717e;\r\n  --ly-line: #dce5ed;\r\n  --ly-warning-bg: #fff9ec;\r\n  --ly-warning-border: #d69a25;\r\n  --ly-success-bg: #f5faf7;\r\n  --ly-success-border: #83ad94;\r\n\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 20px 56px;\r\n  color: var(--ly-text);\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  overflow-wrap: anywhere;\r\n}\r\n\r\n.leeyee-dc-ats-guide p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n.leeyee-dc-ats-guide strong {\r\n  color: #172b3a;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-dc-ats-guide h2 {\r\n  margin: 54px 0 18px;\r\n  color: var(--ly-heading);\r\n  font-size: clamp(28px, 3.1vw, 34px);\r\n  line-height: 1.22;\r\n  letter-spacing: -0.02em;\r\n  font-weight: 760;\r\n}\r\n\r\n.leeyee-dc-ats-guide h3 {\r\n  margin: 32px 0 13px;\r\n  color: #1d3343;\r\n  font-size: clamp(21px, 2.4vw, 25px);\r\n  line-height: 1.32;\r\n  font-weight: 720;\r\n}\r\n\r\n.leeyee-dc-ats-guide a {\r\n  color: var(--ly-blue);\r\n  text-decoration: underline;\r\n  text-decoration-thickness: 1px;\r\n  text-underline-offset: 3px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-kicker {\r\n  display: inline-flex;\r\n  align-items: center;\r\n  gap: 9px;\r\n  margin: 0 0 15px;\r\n  color: var(--ly-blue);\r\n  font-size: 13px;\r\n  line-height: 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12px;\r\n  margin: 23px 0 4px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-decision-item {\r\n  padding: 16px 17px;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 10px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-decision-item strong {\r\n  display: block;\r\n  margin-bottom: 5px;\r\n  color: var(--ly-blue-dark);\r\n  font-size: 15px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-decision-item span {\r\n  display: block;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n\/* ---------- Images ---------- *\/\r\n\r\n.leeyee-dc-ats-guide figure {\r\n  width: 100%;\r\n  margin: 32px 0 39px;\r\n}\r\n\r\n.leeyee-dc-ats-guide figure img {\r\n  display: block;\r\n  width: 100%;\r\n  height: auto;\r\n  margin: 0;\r\n  background: #fff;\r\n  border: 1px solid #dce6ee;\r\n  border-radius: 12px;\r\n  box-shadow: 0 6px 22px rgba(22, 57, 87, .06);\r\n}\r\n\r\n.leeyee-dc-ats-guide figcaption {\r\n  margin-top: 10px;\r\n  color: #687783;\r\n  font-size: 13.5px;\r\n  line-height: 1.55;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-product-evidence {\r\n  max-width: 640px;\r\n  margin-left: auto;\r\n  margin-right: auto;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-product-evidence img {\r\n  object-fit: contain;\r\n}\r\n\r\n\/* ---------- Callouts ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-note,\r\n.leeyee-dc-ats-guide .ly-engineering,\r\n.leeyee-dc-ats-guide .ly-warning {\r\n  margin: 25px 0;\r\n  padding: 19px 21px;\r\n  border-radius: 10px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-note {\r\n  background: var(--ly-blue-pale);\r\n  border: 1px solid #d4e4f2;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-engineering {\r\n  background: #f8fafc;\r\n  border: 1px solid var(--ly-line);\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-warning {\r\n  color: #61480f;\r\n  background: var(--ly-warning-bg);\r\n  border: 1px solid #ead8aa;\r\n  border-left: 4px solid var(--ly-warning-border);\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-note-title {\r\n  display: block;\r\n  margin-bottom: 7px;\r\n  color: var(--ly-blue-dark);\r\n  font-size: 15px;\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-warning .ly-note-title {\r\n  color: #674b0d;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-note p:last-child,\r\n.leeyee-dc-ats-guide .ly-engineering p:last-child,\r\n.leeyee-dc-ats-guide .ly-warning p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n\/* ---------- Small comparison blocks ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-two-col {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 16px;\r\n  margin: 23px 0 28px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-mini-card {\r\n  padding: 20px;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 11px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-mini-card h3 {\r\n  margin: 0 0 9px;\r\n  color: var(--ly-blue-dark);\r\n  font-size: 20px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-mini-card p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-bullets {\r\n  margin: 15px 0 23px;\r\n  padding-left: 23px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-bullets li {\r\n  margin: 7px 0;\r\n  padding-left: 3px;\r\n}\r\n\r\n\/* ---------- Tables ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-table-wrap {\r\n  width: 100%;\r\n  margin: 24px 0 13px;\r\n  overflow: auto;\r\n  background: #fff;\r\n  border: 1px solid var(--ly-line);\r\n  border-radius: 11px;\r\n  -webkit-overflow-scrolling: touch;\r\n}\r\n\r\n.leeyee-dc-ats-guide table {\r\n  width: 100%;\r\n  margin: 0;\r\n  border-collapse: collapse;\r\n  font-size: 15px;\r\n  line-height: 1.5;\r\n}\r\n\r\n.leeyee-dc-ats-guide th,\r\n.leeyee-dc-ats-guide td {\r\n  padding: 14px 15px;\r\n  text-align: left;\r\n  vertical-align: top;\r\n  border-bottom: 1px solid #e4ebf0;\r\n}\r\n\r\n.leeyee-dc-ats-guide th {\r\n  position: sticky;\r\n  top: 0;\r\n  z-index: 1;\r\n  color: #fff;\r\n  background: var(--ly-blue);\r\n  font-size: 14px;\r\n  font-weight: 750;\r\n}\r\n\r\n.leeyee-dc-ats-guide tbody tr:nth-child(even) {\r\n  background: #f9fbfd;\r\n}\r\n\r\n.leeyee-dc-ats-guide tbody tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-table-note {\r\n  margin: 9px 0 25px;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n}\r\n\r\n\/* ---------- Selection steps ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-steps {\r\n  margin: 25px 0 31px;\r\n  padding: 0;\r\n  list-style: none;\r\n  counter-reset: ly-step;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-steps > li {\r\n  position: relative;\r\n  margin: 0 0 16px;\r\n  padding: 2px 0 19px 56px;\r\n  border-bottom: 1px solid #e5ebf0;\r\n  counter-increment: ly-step;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-steps > li:last-child {\r\n  border-bottom: 0;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-steps > li::before {\r\n  content: counter(ly-step);\r\n  position: absolute;\r\n  top: 0;\r\n  left: 0;\r\n  display: grid;\r\n  place-items: center;\r\n  width: 38px;\r\n  height: 38px;\r\n  color: #fff;\r\n  background: var(--ly-blue);\r\n  border-radius: 50%;\r\n  font-size: 15px;\r\n  font-weight: 800;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-steps strong {\r\n  display: block;\r\n  margin-bottom: 4px;\r\n  font-size: 17px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-steps p {\r\n  margin: 0;\r\n  color: #4d5d69;\r\n}\r\n\r\n\/* ---------- LEEYEE product scope ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-scope {\r\n  margin: 27px 0;\r\n  padding: 23px 24px;\r\n  background: var(--ly-success-bg);\r\n  border: 1px solid #cee2d6;\r\n  border-left: 4px solid var(--ly-success-border);\r\n  border-radius: 10px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-scope h3 {\r\n  margin: 0 0 10px;\r\n  font-size: 21px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-scope p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-evidence-caption {\r\n  margin: -13px auto 25px;\r\n  max-width: 640px;\r\n  color: #526470;\r\n  font-size: 14px;\r\n  line-height: 1.6;\r\n}\r\n\r\n\/* ---------- Checklist ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-checklist {\r\n  margin: 27px 0 25px;\r\n  padding: 24px 25px;\r\n  background: var(--ly-blue-pale);\r\n  border: 1px solid #cfe0ef;\r\n  border-radius: 12px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-checklist h3 {\r\n  margin: 0 0 16px;\r\n  color: var(--ly-blue-dark);\r\n  font-size: 22px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-check-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 10px 20px;\r\n  margin: 0;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-check-grid li {\r\n  position: relative;\r\n  padding-left: 25px;\r\n  color: #344552;\r\n  font-size: 15px;\r\n  line-height: 1.55;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-check-grid li::before {\r\n  content: \"\u2713\";\r\n  position: absolute;\r\n  top: 0;\r\n  left: 0;\r\n  color: var(--ly-blue);\r\n  font-weight: 900;\r\n}\r\n\r\n\/* ---------- CTA ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-cta {\r\n  margin: 30px 0 39px;\r\n  padding: 26px;\r\n  background: #f8fbfe;\r\n  border: 1px solid #caddeb;\r\n  border-radius: 12px;\r\n  box-shadow: 0 8px 24px rgba(20, 55, 86, .07);\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-cta h3 {\r\n  margin: 0 0 9px;\r\n  color: #183149;\r\n  font-size: 22px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-cta p {\r\n  margin: 0 0 18px;\r\n  color: #536573;\r\n  font-size: 15px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .leeyee-about-btn-light {\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: 12px 24px;\r\n  border: 2px solid var(--ly-blue);\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: var(--ly-blue);\r\n  font: inherit;\r\n  font-size: 15px;\r\n  line-height: 1.2;\r\n  font-weight: 700;\r\n  text-align: center;\r\n  text-decoration: none;\r\n  cursor: pointer;\r\n  box-shadow: 0 5px 15px rgba(0, 72, 152, .10);\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-dc-ats-guide .leeyee-about-btn-light:hover {\r\n  color: #fff;\r\n  background: var(--ly-blue);\r\n  border-color: var(--ly-blue);\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 7px 18px rgba(0, 72, 152, .18);\r\n}\r\n\r\n.leeyee-dc-ats-guide .leeyee-about-btn-light:focus-visible {\r\n  color: var(--ly-blue);\r\n  background: #fff;\r\n  outline: 3px solid rgba(0, 72, 152, .25);\r\n  outline-offset: 3px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .leeyee-about-btn-light:active {\r\n  transform: translateY(0);\r\n  box-shadow: 0 3px 10px rgba(0, 72, 152, .14);\r\n}\r\n\r\n.leeyee-dc-ats-guide .leeyee-about-btn-light .w-btn-label {\r\n  display: inline-block;\r\n}\r\n\r\n\/* ---------- FAQ \/ References ---------- *\/\r\n\r\n.leeyee-dc-ats-guide .ly-faq {\r\n  margin-top: 21px;\r\n  border-top: 1px solid var(--ly-line);\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-faq-item {\r\n  padding: 22px 0;\r\n  border-bottom: 1px solid var(--ly-line);\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-faq-item h3 {\r\n  margin: 0 0 8px;\r\n  font-size: 19px;\r\n  line-height: 1.4;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-faq-item p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-ref {\r\n  color: var(--ly-blue);\r\n  font-size: .78em;\r\n  font-weight: 750;\r\n  vertical-align: super;\r\n  white-space: nowrap;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-references {\r\n  margin: 22px 0 0;\r\n  padding-left: 22px;\r\n  color: #4f5e6a;\r\n  font-size: 14px;\r\n  line-height: 1.65;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-references li {\r\n  margin: 0 0 15px;\r\n  padding-left: 4px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-reference-title {\r\n  color: #2a3e4d;\r\n  font-weight: 700;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-reference-source {\r\n  display: block;\r\n  margin-top: 4px;\r\n}\r\n\r\n.leeyee-dc-ats-guide .ly-final-note {\r\n  margin-top: 31px;\r\n  padding-top: 19px;\r\n  color: #687783;\r\n  border-top: 1px solid var(--ly-line);\r\n  font-size: 13.5px;\r\n  line-height: 1.6;\r\n}\r\n\r\n\/* ---------- Responsive ---------- *\/\r\n\r\n@media (max-width: 820px) {\r\n  .leeyee-dc-ats-guide {\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide h2 {\r\n    margin-top: 47px;\r\n  }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  .leeyee-dc-ats-guide {\r\n    font-size: 16.5px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-decision-grid,\r\n  .leeyee-dc-ats-guide .ly-two-col,\r\n  .leeyee-dc-ats-guide .ly-check-grid {\r\n    grid-template-columns: 1fr;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-quick,\r\n  .leeyee-dc-ats-guide .ly-checklist,\r\n  .leeyee-dc-ats-guide .ly-cta {\r\n    padding: 21px;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  .leeyee-dc-ats-guide {\r\n    padding: 4px 15px 43px;\r\n    font-size: 16px;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide h2 {\r\n    margin-top: 42px;\r\n    font-size: 27px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide figure {\r\n    margin: 27px 0 32px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-steps > li {\r\n    padding-left: 48px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-steps > li::before {\r\n    width: 34px;\r\n    height: 34px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .leeyee-about-btn-light {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n  }\r\n\r\n  \/* Convert 3-column tables into mobile cards *\/\r\n  .leeyee-dc-ats-guide .ly-table-wrap {\r\n    overflow: visible;\r\n    border: 0;\r\n    background: transparent;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide table,\r\n  .leeyee-dc-ats-guide tbody,\r\n  .leeyee-dc-ats-guide tr,\r\n  .leeyee-dc-ats-guide td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide thead {\r\n    position: absolute;\r\n    width: 1px;\r\n    height: 1px;\r\n    overflow: hidden;\r\n    clip: rect(0 0 0 0);\r\n    white-space: nowrap;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide tbody tr {\r\n    margin-bottom: 14px;\r\n    padding: 7px 14px;\r\n    background: #fff !important;\r\n    border: 1px solid var(--ly-line);\r\n    border-radius: 10px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide td {\r\n    display: grid;\r\n    grid-template-columns: minmax(105px, 36%) 1fr;\r\n    gap: 12px;\r\n    padding: 9px 0;\r\n    border-bottom: 1px solid #e8edf1;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide td::before {\r\n    content: attr(data-label);\r\n    color: var(--ly-blue-dark);\r\n    font-size: 13px;\r\n    line-height: 1.45;\r\n    font-weight: 750;\r\n  }\r\n}\r\n\r\n@media (max-width: 430px) {\r\n  .leeyee-dc-ats-guide {\r\n    padding-left: 13px;\r\n    padding-right: 13px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-quick,\r\n  .leeyee-dc-ats-guide .ly-checklist,\r\n  .leeyee-dc-ats-guide .ly-cta,\r\n  .leeyee-dc-ats-guide .ly-mini-card,\r\n  .leeyee-dc-ats-guide .ly-scope {\r\n    padding: 18px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide td {\r\n    grid-template-columns: 1fr;\r\n    gap: 3px;\r\n  }\r\n}\r\n\r\n@media (max-width: 360px) {\r\n  .leeyee-dc-ats-guide {\r\n    padding-left: 11px;\r\n    padding-right: 11px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide h2 {\r\n    font-size: 25px;\r\n  }\r\n\r\n  .leeyee-dc-ats-guide .ly-quick h2 {\r\n    font-size: 22px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-dc-ats-guide\">\r\n\r\n  <div class=\"ly-kicker\">Data Center ATS Engineering Selection<\/div>\r\n\r\n  <p class=\"ly-intro\">\r\n    Selecting a <strong>data center automatic transfer switch<\/strong> starts with the power architecture, not with the ATS current rating. First identify the normal and emergency sources, the ATS position in the single-line diagram, the UPS position, and the interruption the downstream load can accept. Only then should the project team confirm poles, current rating, protection coordination and remote signals.\r\n  <\/p>\r\n\r\n  <section class=\"ly-quick\">\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\/id\/data-center-automatic-transfer-switch\/#quick-answer-is-an-ats-suitable-for-a-data-center\" >Quick Answer: Is an ATS Suitable for a Data Center?<\/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\/id\/data-center-automatic-transfer-switch\/#where-does-an-automatic-transfer-switch-fit-in-a-data-center\" >Where Does an Automatic Transfer Switch Fit in a Data Center?<\/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\/id\/data-center-automatic-transfer-switch\/#ats-vs-ups-they-solve-different-power-problems\" >ATS vs UPS: They Solve Different Power Problems<\/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\/id\/data-center-automatic-transfer-switch\/#first-decision-can-the-load-accept-open-transition\" >First Decision: Can the Load Accept Open Transition?<\/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\/id\/data-center-automatic-transfer-switch\/#when-should-sts-closed-transition-or-bypassisolation-be-reviewed\" >When Should STS, Closed Transition or Bypass\/Isolation Be Reviewed?<\/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\/id\/data-center-automatic-transfer-switch\/#data-center-ats-selection-follow-this-decision-sequence\" >Data Center ATS Selection: Follow This Decision Sequence<\/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\/id\/data-center-automatic-transfer-switch\/#3p-vs-4p-ats-neutral-switching-is-the-key-question\" >3P vs 4P ATS: Neutral Switching Is the Key Question<\/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\/id\/data-center-automatic-transfer-switch\/#how-should-the-ats-current-rating-be-selected\" >How Should the ATS Current Rating Be Selected?<\/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\/id\/data-center-automatic-transfer-switch\/#generator-coordination-is-part-of-ats-selection\" >Generator Coordination Is Part of ATS Selection<\/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\/id\/data-center-automatic-transfer-switch\/#what-remote-signals-should-be-confirmed\" >What Remote Signals Should Be Confirmed?<\/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\/id\/data-center-automatic-transfer-switch\/#where-a-compact-leeyee-ats-may-fit\" >Where a Compact LEEYEE ATS May Fit<\/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\/id\/data-center-automatic-transfer-switch\/#before-ordering-data-center-ats-project-checklist\" >Before Ordering: Data Center ATS Project Checklist<\/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\/id\/data-center-automatic-transfer-switch\/#common-data-center-ats-selection-mistakes\" >Common Data Center ATS Selection Mistakes<\/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\/id\/data-center-automatic-transfer-switch\/#frequently-asked-engineering-questions\" >Frequently Asked Engineering 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\/id\/data-center-automatic-transfer-switch\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-is-an-ats-suitable-for-a-data-center\"><\/span>Quick Answer: Is an ATS Suitable for a Data Center?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Yes, but not every data-center circuit needs the same transfer equipment. A compact open-transition ATS can be evaluated for suitable generator-backed distribution, auxiliary power and other circuits where the downstream load can accept the transfer interruption or a correctly designed UPS provides the required ride-through. ABB's data-center technical material shows an architecture in which transfer switching is positioned upstream of a UPS.<span class=\"ly-ref\">[2]<\/span>\r\n    <\/p>\r\n\r\n    <p>\r\n      A standard compact open-transition ATS should not automatically be specified for every mission-critical load. IEC 60947-6-1:2026 covers transfer switching equipment and specifically includes bypass\/isolation transfer switch equipment and ATSE with closed-transition capability, while static transfer switches are covered by the IEC 62310 series.<span class=\"ly-ref\">[1][3]<\/span>\r\n    <\/p>\r\n\r\n    <div class=\"ly-decision-grid\">\r\n      <div class=\"ly-decision-item\">\r\n        <strong>Can the load accept open transition?<\/strong>\r\n        <span>If yes, continue the ATS selection process. If not, review the required transfer architecture.<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ly-decision-item\">\r\n        <strong>Is a UPS downstream?<\/strong>\r\n        <span>Confirm which loads it supports and whether the UPS design provides the required ride-through.<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ly-decision-item\">\r\n        <strong>3P or 4P?<\/strong>\r\n        <span>Check neutral switching, source grounding and bonding. Do not decide from phase count alone.<\/span>\r\n      <\/div>\r\n\r\n      <div class=\"ly-decision-item\">\r\n        <strong>Need BMS \/ PLC monitoring?<\/strong>\r\n        <span>Define the required status contacts and communication interface before ordering.<\/span>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <figure>\r\n    <img fetchpriority=\"high\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/data-center-ats-ups-generator-power-architecture.webp\"\r\n      alt=\"Data center ATS power architecture showing utility, generator, automatic transfer switch, UPS, distribution, and critical loads\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Simplified reference architecture showing utility and generator sources feeding an ATS upstream of a UPS and downstream distribution. The real project single-line diagram must determine the final equipment arrangement.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"where-does-an-automatic-transfer-switch-fit-in-a-data-center\"><\/span>Where Does an Automatic Transfer Switch Fit in a Data Center?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      An automatic transfer switch transfers a connected load between power supply sources. IEC 60947-6-1:2026 covers manually, remotely and automatically operated transfer switching equipment, including ATSE and its controller.<span class=\"ly-ref\">[1]<\/span>\r\n    <\/p>\r\n\r\n    <p>\r\n      A common standby arrangement uses utility power as the normal source and a generator as the alternate source. Other two-source arrangements are also possible. Eaton's ATS guidance describes source arrangements including utility-generator, utility-utility and generator-generator configurations.<span class=\"ly-ref\">[4]<\/span>\r\n    <\/p>\r\n\r\n    <p>\r\n      The first procurement question is therefore not simply \u201cWhich data center ATS should we buy?\u201d It is <strong>\u201cWhich two sources are being transferred, where is the ATS in the single-line diagram, and which load does it actually supply?\u201d<\/strong>\r\n    <\/p>\r\n\r\n    <div class=\"ly-engineering\">\r\n      <span class=\"ly-note-title\">Engineering meaning<\/span>\r\n      <p>\r\n        Mark the proposed ATS position on the single-line diagram before selecting a model. Identify both sources, the UPS position, upstream protective devices and downstream load. A switch can have the correct nominal current and still be unsuitable if the transfer method, pole arrangement or system role is wrong.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"ats-vs-ups-they-solve-different-power-problems\"><\/span>ATS vs UPS: They Solve Different Power Problems<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      An ATS and a UPS are not interchangeable. The ATS determines which available source supplies the connected circuit. The UPS performs a different continuity and power-conditioning role for its supported downstream load.\r\n    <\/p>\r\n\r\n    <p>\r\n      ABB's data-center transfer-switching material shows an architecture where transfer switching is upstream of a UPS. In this type of arrangement, the UPS is part of the strategy for keeping sensitive downstream equipment supplied while the upstream source changes.<span class=\"ly-ref\">[2]<\/span>\r\n    <\/p>\r\n\r\n    <div class=\"ly-two-col\">\r\n      <div class=\"ly-mini-card\">\r\n        <h3>Automatic Transfer Switch<\/h3>\r\n        <p>\r\n          Monitors source availability and transfers the connected circuit between normal and alternate sources according to the equipment and project control logic.<span class=\"ly-ref\">[4]<\/span>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-mini-card\">\r\n        <h3>UPS<\/h3>\r\n        <p>\r\n          Supports its downstream load according to the selected UPS architecture and operating conditions. Its location therefore changes how an upstream source transfer affects sensitive equipment.<span class=\"ly-ref\">[2]<\/span>\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"ly-note\">\r\n      <span class=\"ly-note-title\">Buyer meaning<\/span>\r\n      <p>\r\n        Do not tell the ATS supplier only that \u201cthe project has a UPS.\u201d Show whether the UPS is before or after the proposed ATS, identify the loads it supports, and confirm its required ride-through from the approved UPS design documentation.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"first-decision-can-the-load-accept-open-transition\"><\/span>First Decision: Can the Load Accept Open Transition?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      LEEYEE's standard compact ATS product format is intended for <strong>open-transition<\/strong> automatic source transfer. In an open-transition sequence, the connected source is disconnected before the alternate source is connected. This is commonly described as break-before-make operation.\r\n    <\/p>\r\n\r\n    <p>\r\n      Closed transition is a different transfer capability. IEC 60947-6-1:2026 includes specific provisions for ATSE with closed-transition capability, so closed transition should not be assumed to be a standard function of an ordinary open-transition ATS.<span class=\"ly-ref\">[1]<\/span>\r\n    <\/p>\r\n\r\n    <figure>\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/open-transition-ats-break-before-make-diagram.webp\"\r\n        alt=\"Open transition ATS break-before-make sequence from normal source to disconnected state and emergency source\"\r\n        width=\"1448\"\r\n        height=\"1086\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>\r\n        Open-transition principle: disconnect the normal source before connecting the emergency source. Actual transfer timing and source-acceptance conditions depend on the selected ATS, controller configuration and project design.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n    <h3>Open transition may be evaluated when:<\/h3>\r\n\r\n    <ul class=\"ly-bullets\">\r\n      <li>the actual downstream load can accept the transfer interruption;<\/li>\r\n      <li>a correctly designed downstream UPS supports sensitive loads through the upstream transfer;<\/li>\r\n      <li>the ATS serves a suitable generator-backed or auxiliary distribution circuit;<\/li>\r\n      <li>the project specification permits open-transition operation; and<\/li>\r\n      <li>the source, grounding and protection arrangements have been reviewed.<\/li>\r\n    <\/ul>\r\n\r\n    <div class=\"ly-warning\">\r\n      <span class=\"ly-note-title\">Do not select by application name alone<\/span>\r\n      <p>\r\n        A load does not become suitable for a compact open-transition ATS merely because it is located inside a data center. If the circuit requires another transfer-continuity level or a specialized critical-power architecture, stop the standard ATS selection process and confirm the required solution with the project electrical designer.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"when-should-sts-closed-transition-or-bypassisolation-be-reviewed\"><\/span>When Should STS, Closed Transition or Bypass\/Isolation Be Reviewed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Different transfer technologies address different engineering requirements. IEC 60947-6-1:2026 specifically includes bypass\/isolation transfer switch equipment and ATSE with closed-transition capability. Static transfer switches are excluded from that standard's scope because they are covered by the IEC 62310 series.<span class=\"ly-ref\">[1][3]<\/span>\r\n    <\/p>\r\n\r\n    <p>\r\n      ATS versus STS or open versus closed transition should therefore not be treated as a simple feature comparison. The correct direction depends on required continuity, source relationship, load characteristics, maintenance strategy and the complete electrical architecture.\r\n    <\/p>\r\n\r\n    <div class=\"ly-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Project condition<\/th>\r\n            <th>Direction to evaluate<\/th>\r\n            <th>Confirm before selection<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Project condition\">Brief transfer interruption is acceptable<\/td>\r\n            <td data-label=\"Direction\">Open-transition ATS may be evaluated<\/td>\r\n            <td data-label=\"Confirm\">Load tolerance and transfer sequence<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Project condition\">Downstream UPS supports sensitive load<\/td>\r\n            <td data-label=\"Direction\">Upstream ATS may be possible<\/td>\r\n            <td data-label=\"Confirm\">UPS location and actual ride-through design<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Project condition\">Closed transition is specified<\/td>\r\n            <td data-label=\"Direction\">Closed-transition ATSE<\/td>\r\n            <td data-label=\"Confirm\">Source conditions and project requirements<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Project condition\">Bypass\/isolation is specified<\/td>\r\n            <td data-label=\"Direction\">Dedicated bypass\/isolation arrangement<\/td>\r\n            <td data-label=\"Confirm\">Maintenance and isolation requirements<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Project condition\">Static transfer is specified<\/td>\r\n            <td data-label=\"Direction\">STS architecture<\/td>\r\n            <td data-label=\"Confirm\">Load, source and IEC 62310 requirements<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"ly-table-note\">\r\n      Procurement conclusion: similar voltage and current ratings do not make open-transition ATS, closed-transition ATSE, bypass\/isolation equipment and STS interchangeable.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"data-center-ats-selection-follow-this-decision-sequence\"><\/span>Data Center ATS Selection: Follow This Decision Sequence<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      The practical selection path moves from the power architecture toward the device specification. This prevents a common procurement mistake: choosing the amperage first and discovering later that the transfer method, neutral arrangement or monitoring requirements do not match the project.\r\n    <\/p>\r\n\r\n    <figure>\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/data-center-ats-selection-flowchart.webp\"\r\n        alt=\"Data center automatic transfer switch selection flowchart covering power sources, interruption tolerance, UPS, poles, current rating, and remote signals\"\r\n        width=\"1448\"\r\n        height=\"1086\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>\r\n        Recommended B2B selection sequence: confirm sources and transfer requirements before choosing poles, current rating and monitoring functions.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n    <ol class=\"ly-steps\">\r\n      <li>\r\n        <strong>Identify the two power sources.<\/strong>\r\n        <p>\r\n          Confirm whether the circuit transfers between utility and generator, two utility sources, generators or another approved two-source arrangement.\r\n        <\/p>\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>Confirm the acceptable transfer interruption.<\/strong>\r\n        <p>\r\n          Determine whether open transition is acceptable for the actual downstream load and electrical architecture.\r\n        <\/p>\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>Locate the UPS in the single-line diagram.<\/strong>\r\n        <p>\r\n          Identify whether a UPS is downstream of the proposed ATS and exactly which loads it supports.\r\n        <\/p>\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>Determine whether the neutral must be switched.<\/strong>\r\n        <p>\r\n          Review source grounding and bonding before deciding between a three-pole and four-pole arrangement.\r\n        <\/p>\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>Confirm current and protection requirements.<\/strong>\r\n        <p>\r\n          Use the actual circuit design, upstream protection and available fault information instead of a generic data-center size category.\r\n        <\/p>\r\n      <\/li>\r\n\r\n      <li>\r\n        <strong>Define remote control and monitoring.<\/strong>\r\n        <p>\r\n          Confirm generator-start requirements, dry contacts, source\/load status and BMS or PLC interfaces before production.\r\n        <\/p>\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"3p-vs-4p-ats-neutral-switching-is-the-key-question\"><\/span>3P vs 4P ATS: Neutral Switching Is the Key Question<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Do not use the shortcut \u201cthree-phase four-wire system = 4P ATS.\u201d The engineering question is whether the neutral conductor should remain continuous or be switched together with the phase conductors.\r\n    <\/p>\r\n\r\n    <p>\r\n      Schneider Electric \/ ASCO technical guidance describes solid-neutral and switched-neutral transfer-switch configurations and explains that the appropriate arrangement is related to the grounding of the alternate source, including whether it is treated as a separately derived system.<span class=\"ly-ref\">[5][6]<\/span>\r\n    <\/p>\r\n\r\n    <div class=\"ly-two-col\">\r\n      <div class=\"ly-mini-card\">\r\n        <h3>3P Arrangement<\/h3>\r\n        <p>\r\n          The phase conductors are transferred while the neutral remains continuous. Whether this arrangement is appropriate must be confirmed from the source grounding and bonding design.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-mini-card\">\r\n        <h3>4P Arrangement<\/h3>\r\n        <p>\r\n          The neutral is transferred together with the phase conductors. It may be required by particular source and grounding arrangements, but it should not be selected from phase count alone.\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n\r\n    <div class=\"ly-engineering\">\r\n      <span class=\"ly-note-title\">Project confirmation required<\/span>\r\n      <p>\r\n        Provide the grounding or earthing arrangement, generator neutral configuration and single-line diagram before fixing the pole configuration. Multiple generators, multiple transfer switches, ground-fault protection and other complex systems require project-specific review.<span class=\"ly-ref\">[5][6]<\/span>\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"how-should-the-ats-current-rating-be-selected\"><\/span>How Should the ATS Current Rating Be Selected?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Select the ATS for the circuit it actually serves. Do not derive the ATS rating from labels such as \u201csmall data center,\u201d \u201cmedium data center\u201d or from the facility's total IT capacity without confirming the load at the proposed ATS position.\r\n    <\/p>\r\n\r\n    <p>\r\n      Start with the design load current of the ATS feeder. Then verify the selected equipment against system voltage and frequency, load characteristics, upstream protection, conductor or busbar design, model-specific manufacturer ratings and the project's short-circuit coordination requirements.\r\n    <\/p>\r\n\r\n    <div class=\"ly-note\">\r\n      <span class=\"ly-note-title\">Buyer meaning<\/span>\r\n      <p>\r\n        Two facilities with similar total IT capacity can require different ATS ratings because the switches may serve different distribution blocks. For model review, provide the electrical data for the actual ATS feeder rather than only the overall data-center capacity.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Parameter<\/th>\r\n            <th>Why it matters<\/th>\r\n            <th>What to provide<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Parameter\">System voltage \/ frequency<\/td>\r\n            <td data-label=\"Why it matters\">Electrical compatibility<\/td>\r\n            <td data-label=\"Provide\">Project design values<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Parameter\">Design load current<\/td>\r\n            <td data-label=\"Why it matters\">Starting point for current selection<\/td>\r\n            <td data-label=\"Provide\">Current of the actual ATS feeder<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Parameter\">Upstream protection<\/td>\r\n            <td data-label=\"Why it matters\">Protection coordination<\/td>\r\n            <td data-label=\"Provide\">Breaker or fuse information<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Parameter\">Short-circuit information<\/td>\r\n            <td data-label=\"Why it matters\">Fault-condition suitability<\/td>\r\n            <td data-label=\"Provide\">Project fault data where available<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Parameter\">Load characteristics<\/td>\r\n            <td data-label=\"Why it matters\">Can affect equipment selection<\/td>\r\n            <td data-label=\"Provide\">Relevant load type and operating conditions<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"ly-table-note\">\r\n      Final current and short-circuit suitability must be verified against the selected ATS documentation and the project's protection design. Do not infer a universal data-center ATS rating from this guide.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"generator-coordination-is-part-of-ats-selection\"><\/span>Generator Coordination Is Part of ATS Selection<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      In a utility-generator arrangement, the ATS is part of a control sequence rather than an isolated switch. Eaton describes a typical sequence in which the normal source fails, the alternate source becomes available, the load transfers, and the switch later returns the load after the normal source is restored.<span class=\"ly-ref\">[4]<\/span>\r\n    <\/p>\r\n\r\n    <p>\r\n      Generator-start logic, source-acceptance thresholds, transfer delays, retransfer delays and generator cool-down requirements are equipment- and project-specific. Use the approved ATS\/controller documentation, generator design and project sequence of operation rather than copying generic settings.\r\n    <\/p>\r\n\r\n    <div class=\"ly-warning\">\r\n      <span class=\"ly-note-title\">Do not copy generic timer settings<\/span>\r\n      <p>\r\n        A value that is suitable for one installation may be inappropriate for another. Data-center projects can use different generators, UPS systems and distribution architectures. Confirm the actual controller functions and approved settings during engineering review and commissioning.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"what-remote-signals-should-be-confirmed\"><\/span>What Remote Signals Should Be Confirmed?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Data-center and equipment-room projects may need ATS status outside the front panel. Define these requirements before ordering because available contacts, communication interfaces and control permissions depend on the selected ATS and controller.\r\n    <\/p>\r\n\r\n    <div class=\"ly-checklist\">\r\n      <h3>Typical project points to confirm<\/h3>\r\n\r\n      <ul class=\"ly-check-grid\">\r\n        <li>Normal Available<\/li>\r\n        <li>Emergency Available<\/li>\r\n        <li>Load to Normal<\/li>\r\n        <li>Load to Emergency<\/li>\r\n        <li>Fault Alarm<\/li>\r\n        <li>Generator Start Signal<\/li>\r\n        <li>Dry Contact Requirements<\/li>\r\n        <li>BMS \/ PLC Interface<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <p>\r\n      These are project confirmation items, not a statement that every LEEYEE ATS model includes every function. Before production, verify the selected model's terminal definitions, contact ratings, available communication hardware, protocol and point list from its technical documentation.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"where-a-compact-leeyee-ats-may-fit\"><\/span>Where a Compact LEEYEE ATS May Fit<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ly-scope\">\r\n      <h3>Keep the product scope clear<\/h3>\r\n      <p>\r\n        LEEYEE's standard ATS product format is a compact integrated automatic transfer switch intended for low-voltage source-transfer applications. For this page, the relevant selection path is ordinary open-transition transfer. Final suitability still depends on the specific circuit, load and project requirements.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <p>\r\n      The image below shows the actual compact product format discussed in this guide. The photographed units include LEEYEE 2-pole and 4-pole ATS versions with front Auto \/ Manual controls and clearly identified source and load connection areas.\r\n    <\/p>\r\n\r\n    <figure class=\"ly-product-evidence\">\r\n      <img loading=\"lazy\"\r\n        src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n        alt=\"LEEYEE compact 2-pole and 4-pole automatic transfer switches for low-voltage source transfer\"\r\n        width=\"640\"\r\n        height=\"640\"\r\n        loading=\"lazy\"\r\n        decoding=\"async\">\r\n      <figcaption>\r\n        Actual LEEYEE compact ATS product format shown in 2-pole and 4-pole versions. This image confirms the physical product type discussed on this page; it does not by itself confirm suitability for a specific data-center circuit.\r\n      <\/figcaption>\r\n    <\/figure>\r\n\r\n    <p class=\"ly-evidence-caption\">\r\n      <strong>What still requires project confirmation:<\/strong> source arrangement, system voltage and frequency, required poles, load current, neutral treatment, upstream protection, available short-circuit information, acceptable transfer interruption, generator-start requirements and remote signalling.\r\n    <\/p>\r\n\r\n    <p>\r\n      In data-center-related projects, this compact ATS may be evaluated for suitable generator-backed distribution panels, auxiliary power circuits, equipment-room distribution and other circuits where the load can accept open transition or where the downstream architecture provides the required continuity.\r\n    <\/p>\r\n\r\n    <p>\r\n      It should not be treated as a universal replacement for closed-transition ATSE, bypass\/isolation transfer equipment or static transfer systems. IEC 60947-6-1:2026 treats closed-transition and bypass\/isolation functions as specific transfer-switching arrangements, while static transfer switches are covered separately by IEC 62310.<span class=\"ly-ref\">[1][3]<\/span>\r\n    <\/p>\r\n\r\n    <div class=\"ly-warning\">\r\n      <span class=\"ly-note-title\">LEEYEE supply boundary<\/span>\r\n      <p>\r\n        If the project specification explicitly requires closed transition, bypass\/isolation, STS or another specialized critical-power transfer architecture, do not substitute the compact open-transition ATS shown above only because its nominal voltage or current appears suitable. The required transfer architecture must be confirmed separately.\r\n      <\/p>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"before-ordering-data-center-ats-project-checklist\"><\/span>Before Ordering: Data Center ATS Project Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      A useful B2B enquiry should contain enough information to review the ATS inside the electrical system. \u201cNeed ATS for a data center\u201d is not enough information for reliable model confirmation.\r\n    <\/p>\r\n\r\n    <div class=\"ly-checklist\">\r\n      <h3>Prepare these project details<\/h3>\r\n\r\n      <ul class=\"ly-check-grid\">\r\n        <li>Project single-line diagram<\/li>\r\n        <li>Normal source type<\/li>\r\n        <li>Emergency source type<\/li>\r\n        <li>System voltage<\/li>\r\n        <li>System frequency<\/li>\r\n        <li>Single-phase or three-phase<\/li>\r\n        <li>Design load current<\/li>\r\n        <li>Required ATS poles<\/li>\r\n        <li>Neutral switching requirement<\/li>\r\n        <li>Grounding \/ earthing arrangement<\/li>\r\n        <li>Generator neutral arrangement<\/li>\r\n        <li>Upstream protective device<\/li>\r\n        <li>Available short-circuit information<\/li>\r\n        <li>UPS position<\/li>\r\n        <li>Open transition acceptable: Yes \/ No \/ Unknown<\/li>\r\n        <li>Generator-start requirement<\/li>\r\n        <li>Required dry contacts<\/li>\r\n        <li>BMS \/ PLC requirements<\/li>\r\n        <li>Applicable project standard<\/li>\r\n        <li>Destination country \/ local requirements<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n\r\n    <div class=\"ly-cta\">\r\n      <h3>Send Your ATS Requirements for Review<\/h3>\r\n\r\n      <p>\r\n        Share the single-line diagram, source arrangement, voltage, design current, poles, UPS position and required control signals. These details allow LEEYEE to review whether the compact open-transition ATS product format is within the intended project scope.\r\n      <\/p>\r\n\r\n      <button\r\n        type=\"button\"\r\n        class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n        aria-label=\"Request a Quote\">\r\n        <span class=\"w-btn-label\">Request a Quote<\/span>\r\n      <\/button>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"common-data-center-ats-selection-mistakes\"><\/span>Common Data Center ATS Selection Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ly-table-wrap\">\r\n      <table>\r\n        <thead>\r\n          <tr>\r\n            <th>Mistake<\/th>\r\n            <th>Project risk<\/th>\r\n            <th>Better approach<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td data-label=\"Mistake\">Selecting amperes first<\/td>\r\n            <td data-label=\"Project risk\">Architecture and transfer requirements may be missed<\/td>\r\n            <td data-label=\"Better approach\">Start with the single-line diagram<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Mistake\">Assuming ATS means uninterrupted power<\/td>\r\n            <td data-label=\"Project risk\">Open transition includes a source-disconnected interval<\/td>\r\n            <td data-label=\"Better approach\">Check load tolerance and UPS position<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Mistake\">Choosing 4P only because a neutral exists<\/td>\r\n            <td data-label=\"Project risk\">Neutral treatment may not match the grounding design<\/td>\r\n            <td data-label=\"Better approach\">Review source grounding and bonding<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Mistake\">Checking only nominal current<\/td>\r\n            <td data-label=\"Project risk\">Protection and fault requirements may be missed<\/td>\r\n            <td data-label=\"Better approach\">Verify protection and short-circuit coordination<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td data-label=\"Mistake\">Adding BMS requirements after production<\/td>\r\n            <td data-label=\"Project risk\">Required contacts or interfaces may not be available<\/td>\r\n            <td data-label=\"Better approach\">Approve the I\/O and communication requirements first<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"frequently-asked-engineering-questions\"><\/span>Frequently Asked Engineering Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <div class=\"ly-faq\">\r\n\r\n      <div class=\"ly-faq-item\">\r\n        <h3>Can a compact open-transition ATS be used in a data center?<\/h3>\r\n        <p>\r\n          It can be evaluated where the actual downstream load and system architecture can accept the transfer interruption. An upstream ATS may also be part of an architecture with a downstream UPS, but the UPS location and ride-through design must be confirmed for the project.<span class=\"ly-ref\">[2]<\/span>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-faq-item\">\r\n        <h3>Does an ATS replace a UPS?<\/h3>\r\n        <p>\r\n          No. An ATS transfers a circuit between power sources, while a UPS has a different role in supporting its downstream load. They can work within the same backup-power architecture but are not substitutes for each other.<span class=\"ly-ref\">[2][4]<\/span>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-faq-item\">\r\n        <h3>Is 4P always required for a three-phase data center ATS?<\/h3>\r\n        <p>\r\n          No. The decision depends on whether the neutral must be switched and on the grounding and bonding arrangement of the sources. Confirm the actual system design rather than selecting 4P from phase count alone.<span class=\"ly-ref\">[5][6]<\/span>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-faq-item\">\r\n        <h3>Can the ATS current rating be selected from total data center capacity?<\/h3>\r\n        <p>\r\n          Not reliably. Use the electrical design of the circuit actually served by the ATS, then verify the selected model against the applicable voltage, load, protection and fault requirements.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-faq-item\">\r\n        <h3>Is an STS the same as an ATS?<\/h3>\r\n        <p>\r\n          No. IEC 60947-6-1:2026 excludes static transfer switches covered by the IEC 62310 series. STS should therefore be evaluated as a separate transfer technology when the project requires it.<span class=\"ly-ref\">[1][3]<\/span>\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"ly-faq-item\">\r\n        <h3>What should a buyer send for a data center ATS quotation?<\/h3>\r\n        <p>\r\n          Send the single-line diagram, source types, voltage, frequency, phase, design current, proposed poles, grounding arrangement, UPS position, acceptable transfer method, upstream protection and required remote signals. These parameters allow the ATS to be reviewed in its real system context.\r\n        <\/p>\r\n      <\/div>\r\n\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section>\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <ol class=\"ly-references\">\r\n      <li>\r\n        <span class=\"ly-reference-title\">\r\n          International Electrotechnical Commission \u2014 IEC 60947-6-1:2026, Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment.\r\n        <\/span>\r\n        Official IEC publication page confirming the scope for MTSE, RTSE, ATSE, bypass\/isolation transfer switch equipment and ATSE with closed-transition capability.\r\n        <span class=\"ly-reference-source\">\r\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC source<\/a>\r\n        <\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"ly-reference-title\">\r\n          ABB \u2014 Applications for Data Centers: Transfer Switching \/ Automatic Transfer Switching for Redundant Power Systems in Data Centers.\r\n        <\/span>\r\n        ABB technical material covering transfer switching in data-center power architectures and the relationship between transfer switching and downstream UPS systems.\r\n        <span class=\"ly-reference-source\">\r\n          <a href=\"https:\/\/new.abb.com\/low-voltage\/low-voltage-products\/applications\/applications-for-data-centers\" target=\"_blank\" rel=\"noopener noreferrer\">Official ABB source<\/a>\r\n        <\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"ly-reference-title\">\r\n          International Electrotechnical Commission \u2014 IEC 62310-1:2005, Static transfer systems (STS) \u2014 Part 1: General and safety requirements.\r\n        <\/span>\r\n        Official IEC standard for AC static transfer systems intended to support continuity of load supply by controlled transfer between independent AC sources.\r\n        <span class=\"ly-reference-source\">\r\n          <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/6801\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC source<\/a>\r\n        <\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"ly-reference-title\">\r\n          Eaton \u2014 Fundamentals of Automatic Transfer Switches (ATS).\r\n        <\/span>\r\n        Eaton technical guidance covering ATS operation, source monitoring, typical transfer sequences, source arrangements and transfer methods.\r\n        <span class=\"ly-reference-source\">\r\n          <a href=\"https:\/\/www.eaton.com\/my\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Official Eaton source<\/a>\r\n        <\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"ly-reference-title\">\r\n          Schneider Electric \/ ASCO Power Technologies \u2014 Neutral Configurations in Transfer Switches, ASC-DB-NCTS.\r\n        <\/span>\r\n        Technical data bulletin explaining solid-neutral and switched-neutral transfer-switch arrangements and their relationship to alternative-source grounding.\r\n        <span class=\"ly-reference-source\">\r\n          <a href=\"https:\/\/www.se.com\/us\/en\/download\/document\/ASC-DB-NCTS\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric \/ ASCO source<\/a>\r\n        <\/span>\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"ly-reference-title\">\r\n          Schneider Electric \/ ASCO Power Technologies \u2014 Switching the Neutral Conductor, TS-WP-NEUTRALCON.\r\n        <\/span>\r\n        Technical white paper discussing neutral switching and grounding considerations for generator transfer-switch applications.\r\n        <span class=\"ly-reference-source\">\r\n          <a href=\"https:\/\/www.se.com\/us\/en\/download\/document\/TS-WP-NEUTRALCON\/\" target=\"_blank\" rel=\"noopener noreferrer\">Official Schneider Electric \/ ASCO source<\/a>\r\n        <\/span>\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <p class=\"ly-final-note\">\r\n      This guide is a B2B engineering selection reference, not a substitute for the project electrical design. Final ATS approval should use the current project specification, applicable local electrical requirements, single-line diagram, protection study and model-specific technical documentation.\r\n    <\/p>\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>Data Center ATS Engineering SelectionSelecting a data center automatic transfer switch starts with the power architecture, not with the ATS current rating. First identify the normal and emergency sources, the ATS position in the single-line diagram, the UPS position, and the interruption the downstream load can accept. Only then should the project team confirm poles,&#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-31366","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>Data Center Automatic Transfer Switch (ATS) Selection Guide<\/title>\n<meta name=\"description\" content=\"Learn how to select a data center automatic transfer switch by power architecture, UPS position, open-transition requirements, 3P vs 4P, current rating, generator coordination, and BMS signals.\" \/>\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\/id\/data-center-automatic-transfer-switch\/\" \/>\n<meta property=\"og:locale\" content=\"id_ID\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Data Center Automatic Transfer Switch (ATS) Selection Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to select a data center automatic transfer switch by power architecture, UPS position, open-transition requirements, 3P vs 4P, current rating, generator coordination, and BMS signals.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/id\/data-center-automatic-transfer-switch\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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