{"id":31681,"date":"2026-10-15T09:29:36","date_gmt":"2026-10-15T01:29:36","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31681"},"modified":"2026-10-15T09:29:58","modified_gmt":"2026-10-15T01:29:58","slug":"ats-vs-avr-for-generator-backup-systems-whats-the-difference","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/it\/ats-and-avr-generator-systems\/","title":{"rendered":"ATS vs AVR for Generator Backup Systems: What\u2019s the Difference?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31681\" class=\"elementor elementor-31681\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b3c9f5d e-flex e-con-boxed e-con e-parent\" data-id=\"b3c9f5d\" 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-4ec3485 elementor-widget elementor-widget-html\" data-id=\"4ec3485\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<style>\r\n#leeyee-ats-avr-guide {\r\n  --ly-blue: #004898;\r\n  --ly-blue-dark: #00386f;\r\n  --ly-blue-soft: #eef5ff;\r\n  --ly-blue-soft-2: #f7fbff;\r\n  --ly-text: #263442;\r\n  --ly-heading: #172533;\r\n  --ly-muted: #647384;\r\n  --ly-border: #d9e4ee;\r\n  --ly-warning-bg: #fff8ed;\r\n  --ly-radius: 12px;\r\n\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 0 auto;\r\n  padding: 8px 0 42px;\r\n  color: var(--ly-text);\r\n  font-size: 17px;\r\n  line-height: 1.72;\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-ats-avr-guide *,\r\n#leeyee-ats-avr-guide *::before,\r\n#leeyee-ats-avr-guide *::after {\r\n  box-sizing: border-box;\r\n}\r\n\r\n#leeyee-ats-avr-guide p {\r\n  margin: 0 0 18px;\r\n}\r\n\r\n#leeyee-ats-avr-guide strong {\r\n  color: var(--ly-heading);\r\n}\r\n\r\n#leeyee-ats-avr-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  overflow-wrap: anywhere;\r\n}\r\n\r\n#leeyee-ats-avr-guide a:hover {\r\n  color: var(--ly-blue-dark);\r\n}\r\n\r\n#leeyee-ats-avr-guide h2 {\r\n  margin: 52px 0 18px;\r\n  color: var(--ly-heading);\r\n  font-size: clamp(27px, 3.2vw, 33px);\r\n  line-height: 1.22;\r\n  font-weight: 760;\r\n  letter-spacing: -0.018em;\r\n}\r\n\r\n#leeyee-ats-avr-guide h3 {\r\n  margin: 31px 0 12px;\r\n  color: var(--ly-heading);\r\n  font-size: clamp(21px, 2.5vw, 25px);\r\n  line-height: 1.3;\r\n  font-weight: 730;\r\n}\r\n\r\n#leeyee-ats-avr-guide ul,\r\n#leeyee-ats-avr-guide ol {\r\n  margin: 14px 0 22px;\r\n  padding-left: 24px;\r\n}\r\n\r\n#leeyee-ats-avr-guide li {\r\n  margin: 8px 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-eyebrow {\r\n  display: inline-block;\r\n  margin: 0 0 12px;\r\n  color: var(--ly-blue);\r\n  font-size: 13px;\r\n  line-height: 1.3;\r\n  font-weight: 800;\r\n  letter-spacing: .075em;\r\n  text-transform: uppercase;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-intro {\r\n  margin: 0 0 23px;\r\n  color: #324354;\r\n  font-size: 18px;\r\n  line-height: 1.67;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-quick-answer {\r\n  margin: 26px 0 33px;\r\n  padding: 24px 26px;\r\n  border: 1px solid #c9dcef;\r\n  border-left: 4px solid var(--ly-blue);\r\n  border-radius: var(--ly-radius);\r\n  background: var(--ly-blue-soft-2);\r\n  box-shadow: 0 7px 20px rgba(0, 72, 152, .05);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-quick-answer h2 {\r\n  margin: 0 0 12px;\r\n  font-size: 25px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-quick-answer p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-key-line {\r\n  margin-top: 16px;\r\n  padding-top: 15px;\r\n  border-top: 1px solid #d8e6f3;\r\n  color: var(--ly-heading);\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-definition-note {\r\n  margin: 20px 0 28px;\r\n  padding: 16px 18px;\r\n  border-left: 3px solid var(--ly-blue);\r\n  border-radius: 0 8px 8px 0;\r\n  background: #f7fbff;\r\n  color: #33485a;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-figure {\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin: 30px auto 38px;\r\n  padding: 0;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-figure.leeyee-figure-wide {\r\n  width: 100%;\r\n  max-width: 860px;\r\n  margin-left: auto;\r\n  margin-right: auto;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-figure img {\r\n  display: block;\r\n  width: 100%;\r\n  max-width: 100%;\r\n  height: auto;\r\n  margin: 0 auto;\r\n  object-fit: contain;\r\n  border: 1px solid #dce6ef;\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  box-shadow: 0 8px 24px rgba(24, 50, 74, .065);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-product-figure {\r\n  width: 100%;\r\n  max-width: 560px;\r\n  margin: 28px auto 38px;\r\n  padding: 22px;\r\n  border: 1px solid #e0e8ef;\r\n  border-radius: 12px;\r\n  background: #fff;\r\n  text-align: center;\r\n  box-shadow: 0 8px 22px rgba(24, 50, 74, .055);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-product-figure img {\r\n  display: block;\r\n  width: auto;\r\n  max-width: 100%;\r\n  height: auto;\r\n  max-height: 520px;\r\n  margin: 0 auto;\r\n  object-fit: contain;\r\n  border: 0;\r\n  border-radius: 0;\r\n  background: transparent;\r\n  box-shadow: none;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-caption {\r\n  width: 100%;\r\n  max-width: 780px;\r\n  margin: 11px auto 0;\r\n  padding: 0 8px;\r\n  color: var(--ly-muted);\r\n  font-size: 14px;\r\n  line-height: 1.55;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-table-note {\r\n  margin: 0 0 10px;\r\n  color: var(--ly-muted);\r\n  font-size: 15px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-table-wrap {\r\n  width: 100%;\r\n  margin: 18px 0 14px;\r\n  border: 1px solid var(--ly-border);\r\n  border-radius: 11px;\r\n  overflow: hidden;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-ats-avr-guide table {\r\n  width: 100%;\r\n  margin: 0;\r\n  border-collapse: collapse;\r\n  table-layout: fixed;\r\n}\r\n\r\n#leeyee-ats-avr-guide th,\r\n#leeyee-ats-avr-guide td {\r\n  padding: 14px 15px;\r\n  border-right: 1px solid #e5ebf1;\r\n  border-bottom: 1px solid #e5ebf1;\r\n  text-align: left;\r\n  vertical-align: top;\r\n  line-height: 1.5;\r\n}\r\n\r\n#leeyee-ats-avr-guide th:last-child,\r\n#leeyee-ats-avr-guide td:last-child {\r\n  border-right: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide tr:last-child td {\r\n  border-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide th {\r\n  background: var(--ly-blue);\r\n  color: #fff;\r\n  font-size: 15px;\r\n  font-weight: 750;\r\n}\r\n\r\n#leeyee-ats-avr-guide td {\r\n  color: #334554;\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-ats-avr-guide td:first-child {\r\n  color: var(--ly-heading);\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-buyer-meaning {\r\n  margin: 12px 0 28px;\r\n  padding: 14px 17px;\r\n  border-left: 3px solid var(--ly-blue);\r\n  border-radius: 0 8px 8px 0;\r\n  background: var(--ly-blue-soft-2);\r\n  color: #33485a;\r\n  font-size: 15.5px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-warning {\r\n  margin: 24px 0 30px;\r\n  padding: 20px 22px;\r\n  border: 1px solid #f0d5ac;\r\n  border-left: 4px solid #cf7a12;\r\n  border-radius: var(--ly-radius);\r\n  background: var(--ly-warning-bg);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-warning strong {\r\n  color: #78420b;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-engineering-note {\r\n  margin: 24px 0 30px;\r\n  padding: 20px 22px;\r\n  border: 1px solid #cfe0ef;\r\n  border-radius: var(--ly-radius);\r\n  background: var(--ly-blue-soft);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-engineering-note p:last-child,\r\n#leeyee-ats-avr-guide .leeyee-warning p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-decision-list {\r\n  margin: 18px 0 28px;\r\n  padding: 0;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-decision-list li {\r\n  position: relative;\r\n  margin: 0;\r\n  padding: 15px 18px 15px 44px;\r\n  border-bottom: 1px solid #e5ebf1;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-decision-list li:first-child {\r\n  border-top: 1px solid #e5ebf1;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-decision-list li::before {\r\n  content: \"\u2713\";\r\n  position: absolute;\r\n  left: 14px;\r\n  top: 15px;\r\n  width: 21px;\r\n  height: 21px;\r\n  color: var(--ly-blue);\r\n  font-weight: 800;\r\n  line-height: 21px;\r\n  text-align: center;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-checklist {\r\n  margin: 22px 0 30px;\r\n  padding: 24px 26px;\r\n  border: 1px solid #cbddeb;\r\n  border-radius: var(--ly-radius);\r\n  background: var(--ly-blue-soft-2);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-checklist h3 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-checklist-grid {\r\n  display: grid;\r\n  grid-template-columns: repeat(2, minmax(0, 1fr));\r\n  gap: 10px 28px;\r\n  margin: 18px 0 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-check-item {\r\n  position: relative;\r\n  padding: 7px 0 7px 28px;\r\n  color: #34495a;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-check-item::before {\r\n  content: \"\";\r\n  position: absolute;\r\n  left: 0;\r\n  top: 11px;\r\n  width: 15px;\r\n  height: 15px;\r\n  border: 2px solid var(--ly-blue);\r\n  border-radius: 3px;\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-scope {\r\n  margin: 28px 0;\r\n  padding: 21px 23px;\r\n  border: 1px solid #d3e0ea;\r\n  border-radius: var(--ly-radius);\r\n  background: #fff;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-scope-title {\r\n  margin-bottom: 8px;\r\n  color: var(--ly-blue);\r\n  font-size: 16px;\r\n  font-weight: 800;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-scope p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-cta {\r\n  margin: 34px 0 42px;\r\n  padding: 25px 27px;\r\n  border: 1px solid #c9dbea;\r\n  border-radius: var(--ly-radius);\r\n  background: var(--ly-blue-soft-2);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-cta h2 {\r\n  margin: 0 0 10px;\r\n  font-size: 26px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-cta p {\r\n  max-width: 720px;\r\n  margin-bottom: 18px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n  appearance: none;\r\n  -webkit-appearance: none;\r\n  min-height: 50px;\r\n  display: inline-flex;\r\n  align-items: center;\r\n  justify-content: center;\r\n  margin: 0;\r\n  padding: 12px 24px;\r\n  border: 2px solid #004898;\r\n  border-radius: 10px;\r\n  background: #fff;\r\n  color: #004898;\r\n  box-shadow: 0 5px 14px rgba(0, 72, 152, .11);\r\n  font: inherit;\r\n  font-size: 16px;\r\n  line-height: 1.2;\r\n  font-weight: 700;\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    transform .18s ease,\r\n    box-shadow .18s ease;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-about-btn-light.leeyee-site-popup-btn:hover {\r\n  background: #004898;\r\n  color: #fff;\r\n  transform: translateY(-1px);\r\n  box-shadow: 0 7px 18px rgba(0, 72, 152, .17);\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-about-btn-light.leeyee-site-popup-btn:focus-visible {\r\n  outline: 3px solid rgba(0, 72, 152, .28);\r\n  outline-offset: 3px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq {\r\n  margin-top: 18px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq details {\r\n  margin: 0;\r\n  border-top: 1px solid #dfe6ec;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq details:last-child {\r\n  border-bottom: 1px solid #dfe6ec;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq summary {\r\n  position: relative;\r\n  padding: 18px 38px 18px 0;\r\n  color: var(--ly-heading);\r\n  font-weight: 720;\r\n  line-height: 1.45;\r\n  cursor: pointer;\r\n  list-style: none;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq summary::-webkit-details-marker {\r\n  display: none;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq summary::after {\r\n  content: \"+\";\r\n  position: absolute;\r\n  right: 3px;\r\n  top: 15px;\r\n  color: var(--ly-blue);\r\n  font-size: 26px;\r\n  font-weight: 500;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq details[open] summary::after {\r\n  content: \"\u2212\";\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq-answer {\r\n  padding: 0 38px 18px 0;\r\n  color: #415262;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-faq-answer p:last-child {\r\n  margin-bottom: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-references {\r\n  margin-top: 52px;\r\n  padding-top: 28px;\r\n  border-top: 1px solid #dbe3ea;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-references h2 {\r\n  margin-top: 0;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-references ol {\r\n  padding-left: 22px;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-references li {\r\n  margin: 11px 0;\r\n  color: #526272;\r\n  font-size: 14.5px;\r\n  line-height: 1.6;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-reference-title {\r\n  color: var(--ly-heading);\r\n  font-weight: 700;\r\n}\r\n\r\n#leeyee-ats-avr-guide .leeyee-small-note {\r\n  color: var(--ly-muted);\r\n  font-size: 14.5px;\r\n}\r\n\r\n@media (max-width: 1024px) {\r\n  #leeyee-ats-avr-guide {\r\n    padding-left: 22px;\r\n    padding-right: 22px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-figure,\r\n  #leeyee-ats-avr-guide .leeyee-figure.leeyee-figure-wide {\r\n    width: 100%;\r\n    max-width: 100%;\r\n    margin-left: auto;\r\n    margin-right: auto;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-product-figure {\r\n    max-width: 520px;\r\n  }\r\n}\r\n\r\n@media (max-width: 768px) {\r\n  #leeyee-ats-avr-guide {\r\n    padding-left: 18px;\r\n    padding-right: 18px;\r\n    font-size: 16.5px;\r\n    line-height: 1.7;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide h2 {\r\n    margin-top: 42px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide h3 {\r\n    margin-top: 28px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-quick-answer,\r\n  #leeyee-ats-avr-guide .leeyee-checklist,\r\n  #leeyee-ats-avr-guide .leeyee-cta {\r\n    padding: 21px 20px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-checklist-grid {\r\n    grid-template-columns: 1fr;\r\n    gap: 3px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-table-wrap {\r\n    border: 0;\r\n    overflow: visible;\r\n    background: transparent;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide table,\r\n  #leeyee-ats-avr-guide thead,\r\n  #leeyee-ats-avr-guide tbody,\r\n  #leeyee-ats-avr-guide tr,\r\n  #leeyee-ats-avr-guide th,\r\n  #leeyee-ats-avr-guide td {\r\n    display: block;\r\n    width: 100%;\r\n  }\r\n\r\n  #leeyee-ats-avr-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-ats-avr-guide tr {\r\n    margin-bottom: 14px;\r\n    border: 1px solid #dbe5ed;\r\n    border-radius: 10px;\r\n    overflow: hidden;\r\n    background: #fff;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide td {\r\n    position: relative;\r\n    min-height: 48px;\r\n    padding: 12px 14px 12px 43%;\r\n    border-right: 0;\r\n    border-bottom: 1px solid #e6edf2;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide td:last-child {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide td::before {\r\n    content: attr(data-label);\r\n    position: absolute;\r\n    left: 14px;\r\n    top: 12px;\r\n    width: 36%;\r\n    color: var(--ly-blue);\r\n    font-size: 13px;\r\n    line-height: 1.4;\r\n    font-weight: 800;\r\n  }\r\n}\r\n\r\n@media (max-width: 600px) {\r\n  #leeyee-ats-avr-guide .leeyee-figure {\r\n    margin-top: 24px;\r\n    margin-bottom: 30px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-figure img {\r\n    width: 100%;\r\n    max-width: 100%;\r\n    height: auto;\r\n    border-radius: 9px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-product-figure {\r\n    width: 100%;\r\n    max-width: 100%;\r\n    margin: 24px auto 32px;\r\n    padding: 16px;\r\n    border-radius: 10px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-product-figure img {\r\n    width: auto;\r\n    max-width: 100%;\r\n    height: auto;\r\n    max-height: 420px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-caption {\r\n    margin-top: 9px;\r\n    padding: 0 2px;\r\n    font-size: 13.5px;\r\n    line-height: 1.5;\r\n    text-align: left;\r\n  }\r\n}\r\n\r\n@media (max-width: 540px) {\r\n  #leeyee-ats-avr-guide {\r\n    padding-left: 15px;\r\n    padding-right: 15px;\r\n    font-size: 16px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-intro {\r\n    font-size: 17px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-quick-answer,\r\n  #leeyee-ats-avr-guide .leeyee-definition-note,\r\n  #leeyee-ats-avr-guide .leeyee-engineering-note,\r\n  #leeyee-ats-avr-guide .leeyee-warning,\r\n  #leeyee-ats-avr-guide .leeyee-checklist,\r\n  #leeyee-ats-avr-guide .leeyee-scope,\r\n  #leeyee-ats-avr-guide .leeyee-cta {\r\n    padding: 18px 17px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide td {\r\n    padding: 10px 12px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide td::before {\r\n    position: static;\r\n    display: block;\r\n    width: auto;\r\n    margin-bottom: 4px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-about-btn-light.leeyee-site-popup-btn {\r\n    width: 100%;\r\n    min-height: 50px;\r\n    padding-left: 16px;\r\n    padding-right: 16px;\r\n  }\r\n}\r\n\r\n@media (max-width: 390px) {\r\n  #leeyee-ats-avr-guide {\r\n    padding-left: 12px;\r\n    padding-right: 12px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide h2 {\r\n    font-size: 27px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide h3 {\r\n    font-size: 21px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-product-figure {\r\n    padding: 12px;\r\n  }\r\n\r\n  #leeyee-ats-avr-guide .leeyee-product-figure img {\r\n    max-height: 360px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article id=\"leeyee-ats-avr-guide\" aria-label=\"ATS versus AVR for generator backup systems technical guide\">\r\n\r\n  <span class=\"leeyee-eyebrow\">Generator Backup System Guide<\/span>\r\n\r\n  <p class=\"leeyee-intro\">\r\n    An <strong>automatic transfer switch (ATS)<\/strong> and a generator <strong>automatic voltage regulator (AVR)<\/strong> solve two different problems in a backup power system. The ATS determines <strong>which source feeds the load<\/strong>. By contrast, the AVR controls alternator excitation to help maintain generator output voltage. Therefore, one cannot replace the other. [1][2][3]\r\n  <\/p>\r\n\r\n  <p>\r\n    For generator integrators, panel builders and project buyers, this distinction affects both equipment selection and troubleshooting. If generator voltage becomes unstable, changing the ATS will not regulate that voltage. Instead, the ATS monitors the source and decides whether it is suitable for transfer, while the generator or alternator control system manages voltage regulation. [2][3]\r\n  <\/p>\r\n\r\n  <section class=\"leeyee-quick-answer\" aria-labelledby=\"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\/it\/ats-and-avr-generator-systems\/#quick-answer-ats-vs-avr-%e2%80%94-do-you-need-both\" >Quick Answer: ATS vs AVR \u2014 Do You Need Both?<\/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\/it\/ats-and-avr-generator-systems\/#ats-vs-avr-what-is-the-actual-difference\" >ATS vs AVR: What Is the Actual Difference?<\/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\/it\/ats-and-avr-generator-systems\/#do-i-need-ats-avr-or-both\" >Do I Need ATS, AVR, or Both?<\/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\/it\/ats-and-avr-generator-systems\/#what-happens-during-a-utility-to-generator-transfer\" >What Happens During a Utility-to-Generator Transfer?<\/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\/it\/ats-and-avr-generator-systems\/#why-should-an-ats-wait-for-a-stable-generator-source\" >Why Should an ATS Wait for a Stable Generator Source?<\/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\/it\/ats-and-avr-generator-systems\/#ats-avr-ups-and-genset-controller-different-jobs-in-one-system\" >ATS, AVR, UPS and Genset Controller: Different Jobs in One System<\/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\/it\/ats-and-avr-generator-systems\/#when-does-a-generator-system-need-an-avr\" >When Does a Generator System Need an AVR?<\/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\/it\/ats-and-avr-generator-systems\/#when-can-you-buy-an-ats-without-buying-a-separate-avr\" >When Can You Buy an ATS Without Buying a Separate AVR?<\/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\/it\/ats-and-avr-generator-systems\/#what-should-you-check-before-selecting-a-generator-ats\" >What Should You Check Before Selecting a Generator ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-and-avr-generator-systems\/#three-common-ats-and-avr-specification-mistakes\" >Three Common ATS and AVR Specification Mistakes<\/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\/it\/ats-and-avr-generator-systems\/#where-leeyee-fits-into-a-generator-backup-system\" >Where LEEYEE Fits Into a Generator Backup System<\/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\/it\/ats-and-avr-generator-systems\/#need-to-confirm-an-ats-for-your-generator-system\" >Need to Confirm an ATS for Your Generator System?<\/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\/it\/ats-and-avr-generator-systems\/#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-14\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/it\/ats-and-avr-generator-systems\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2 id=\"quick-answer\"><span class=\"ez-toc-section\" id=\"quick-answer-ats-vs-avr-%e2%80%94-do-you-need-both\"><\/span>Quick Answer: ATS vs AVR \u2014 Do You Need Both?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      <strong>Many generator backup systems use both ATS and AVR functions, but this does not always mean buying two separate external devices.<\/strong> The generator alternator may already include an AVR. In that case, the buyer selects the ATS separately to monitor the normal and emergency sources and transfer the load according to the configured control logic. [2][3]\r\n    <\/p>\r\n\r\n    <p>\r\n      If the generator cannot produce acceptable voltage, investigate the generator, alternator, excitation system, AVR configuration and loading. In other words, do not treat the ATS as a voltage stabilizer.\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-key-line\">\r\n      ATS = source selection and transfer. AVR = alternator voltage regulation. Governor \/ engine control = speed and frequency control.\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <div class=\"leeyee-definition-note\">\r\n    <strong>Important terminology:<\/strong> in this guide, <strong>AVR<\/strong> means the automatic voltage regulator used in the generator alternator excitation system. It does not mean a separate external line-voltage stabilizer that may also be marketed under the abbreviation \u201cAVR.\u201d\r\n  <\/div>\r\n\r\n  <figure class=\"leeyee-figure leeyee-figure-wide\">\r\n    <img fetchpriority=\"high\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-avr-generator-backup-system-architecture.webp\"\r\n      alt=\"ATS and AVR roles in a generator backup power system\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"eager\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption class=\"leeyee-caption\">\r\n      The AVR belongs to the generator alternator voltage-regulation loop. Meanwhile, the ATS sits in the source-transfer path between normal power, generator power and the load.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-vs-avr-what-is-the-actual-difference\"><\/span>ATS vs AVR: What Is the Actual Difference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p class=\"leeyee-table-note\">\r\n    For procurement, focus on the last column: <strong>what each device changes in the project.<\/strong>\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table aria-label=\"ATS versus AVR comparison\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:18%;\">Device<\/th>\r\n          <th style=\"width:27%;\">Primary job<\/th>\r\n          <th style=\"width:27%;\">What it monitors or controls<\/th>\r\n          <th style=\"width:28%;\">Project meaning<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Device\">ATS<\/td>\r\n          <td data-label=\"Primary job\">Transfers the load between available power sources<\/td>\r\n          <td data-label=\"Monitors \/ controls\">Source availability and, depending on the controller, voltage, frequency and transfer timing<\/td>\r\n          <td data-label=\"Project meaning\">Determines when the load changes between utility and generator<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Device\">Generator AVR<\/td>\r\n          <td data-label=\"Primary job\">Regulates alternator output voltage<\/td>\r\n          <td data-label=\"Monitors \/ controls\">Alternator voltage feedback and excitation<\/td>\r\n          <td data-label=\"Project meaning\">Helps the generator maintain required output voltage under operating conditions<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-buyer-meaning\">\r\n    <strong>Buyer meaning:<\/strong> an ATS specification answers \u201cwhich source should feed the load?\u201d An AVR specification answers \u201chow is generator alternator voltage regulated?\u201d Therefore, treating them as interchangeable can result in the wrong equipment being ordered.\r\n  <\/div>\r\n\r\n  <h3>What the ATS Controls<\/h3>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 defines transfer switching equipment around transferring a load between power supply sources. The current edition covers automatic transfer switching equipment and stand-alone ATS controllers. [1]\r\n  <\/p>\r\n\r\n  <h3>What the AVR Controls<\/h3>\r\n\r\n  <p>\r\n    By comparison, STAMFORD describes an AVR as part of a brushless alternator excitation system. Its closed-loop control senses alternator output voltage and adjusts excitation to regulate the output. [3]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"do-i-need-ats-avr-or-both\"><\/span>Do I Need ATS, AVR, or Both?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p class=\"leeyee-table-note\">\r\n    Use this as an initial decision guide only. Final equipment selection still depends on the actual genset and project control design.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table aria-label=\"ATS and AVR selection decision table\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:46%;\">Project situation<\/th>\r\n          <th style=\"width:54%;\">What to investigate or specify<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Situation\">Need automatic utility-to-generator switching<\/td>\r\n          <td data-label=\"Usually required\">ATS or equivalent automatic transfer equipment<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Situation\">Generator already includes its designed AVR<\/td>\r\n          <td data-label=\"Usually required\">ATS may be selected separately; confirm genset documentation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Situation\">Generator voltage is unstable or outside requirement<\/td>\r\n          <td data-label=\"Usually required\">Investigate generator, alternator, AVR\/excitation system and loading; do not expect the ATS to regulate voltage<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Situation\">Load cannot tolerate generator start and open-transition interruption<\/td>\r\n          <td data-label=\"Usually required\">ATS plus a suitable UPS or other continuity strategy may be required<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <div class=\"leeyee-buyer-meaning\">\r\n    <strong>Procurement conclusion:<\/strong> if the generator already includes the correct voltage-regulation system, the buyer may only need to specify the ATS separately. However, the buyer must still confirm the generator output, controller interfaces and transfer logic.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-happens-during-a-utility-to-generator-transfer\"><\/span>What Happens During a Utility-to-Generator Transfer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A generator backup transfer involves more than detecting that utility power disappeared. First, the ATS identifies that the normal source has failed or moved outside its configured acceptance conditions. Next, the control system starts the generator. Finally, the ATS waits until the alternate source becomes suitable before it transfers the load. Eaton describes transfer after the alternate source reaches acceptable voltage and frequency conditions. [2]\r\n  <\/p>\r\n\r\n  <p>\r\n    However, no single timing sequence applies to every project. The ATS controller, generator controller and project specification determine the generator-start signal, sensing thresholds, transfer delays and retransfer sequence. Therefore, buyers should confirm these values from the selected equipment documentation rather than copy them from a generic diagram.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure leeyee-figure-wide\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-generator-voltage-source-qualification-sequence.webp\"\r\n      alt=\"ATS generator voltage and frequency source qualification sequence before transfer\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption class=\"leeyee-caption\">\r\n      Typical source-qualification logic before generator transfer. Actual voltage, frequency and delay settings depend on the controller and project.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h3>1. The Normal Source Becomes Unacceptable<\/h3>\r\n\r\n  <p>\r\n    The transfer controller monitors the normal source according to its available sensing functions and programmed settings. For example, some controllers can evaluate undervoltage, overvoltage, underfrequency, overfrequency and other source conditions. [2][4]\r\n  <\/p>\r\n\r\n  <h3>2. The ATS Requests Generator Start<\/h3>\r\n\r\n  <p>\r\n    In a utility-generator system, the ATS or wider control system can send a remote generator-start request. The genset controller then manages engine starting, generator monitoring, alarms and stop logic. For example, Deep Sea Electronics documents controllers that monitor mains and generator supplies and manage automatic generator start\/stop and load-transfer control functions. [5]\r\n  <\/p>\r\n\r\n  <h3>3. Generator Voltage and Frequency Establish<\/h3>\r\n\r\n  <p>\r\n    After the engine starts, the alternator begins producing electrical power. The AVR controls excitation to regulate generator voltage. By contrast, generator frequency closely follows rotational speed and therefore depends on the engine governor and genset speed-control system. Cummins technical documentation separates engine speed\/frequency control from alternator voltage control. [3][7]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-warning\">\r\n    <p>\r\n      <strong>Do not confuse voltage regulation with frequency regulation.<\/strong> An AVR primarily controls alternator voltage through excitation. Therefore, if generator frequency is unstable, review engine speed, governing behaviour, loading and the complete genset system instead of assuming the AVR alone caused the problem.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h3>4. The ATS Qualifies the Emergency Source<\/h3>\r\n\r\n  <p>\r\n    The ATS should not transfer simply because voltage appears at the generator terminals. Instead, the controller applies its configured source-acceptance logic. Once the alternate source satisfies the required conditions for the specified period, the ATS can complete the transfer. [2][4]\r\n  <\/p>\r\n\r\n  <h3>5. The ATS Transfers the Load<\/h3>\r\n\r\n  <p>\r\n    After qualification and any programmed transfer delay, an open-transition ATS disconnects the load from one source before connecting it to the other. LEEYEE\u2019s standard compact ATS offering primarily supports ordinary <strong>open-transition source transfer<\/strong>. Therefore, buyers should not treat it as a UPS or zero-break transfer system.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-should-an-ats-wait-for-a-stable-generator-source\"><\/span>Why Should an ATS Wait for a Stable Generator Source?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>The Generator Needs Time to Become Ready<\/h3>\r\n\r\n  <p>\r\n    A generator needs time to start and establish suitable electrical output. If the system connects the load too early, the project may experience an unsuccessful transfer, abnormal load operation, repeated control actions or generator loading before the source becomes ready.\r\n  <\/p>\r\n\r\n  <h3>The ATS Uses Source Acceptance Logic<\/h3>\r\n\r\n  <p>\r\n    Therefore, transfer systems use source sensing and configurable delays. Eaton ATS documentation describes controller functions that can include undervoltage, overvoltage, underfrequency, overfrequency and programmable transfer intervals. However, the actual values depend on the application and controller. [4]\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\">\r\n    <p>\r\n      <strong>Engineering meaning:<\/strong> \u201cgenerator voltage is unstable\u201d does not provide enough information to select or reject an ATS.\r\n    <\/p>\r\n    <p>\r\n      Instead, confirm generator rated voltage, measured voltage behaviour, frequency, load condition, AVR\/excitation configuration, engine\/governor behaviour and the ATS controller\u2019s allowable sensing settings. Then let the genset integrator or project engineer determine the final control sequence.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"ats-avr-ups-and-genset-controller-different-jobs-in-one-system\"><\/span>ATS, AVR, UPS and Genset Controller: Different Jobs in One System<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Generator backup projects often combine several devices. Although they work together, they do not perform the same job. Therefore, a reliable design starts by assigning one clear responsibility to each device.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure leeyee-figure-wide\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-avr-ups-genset-controller-function-comparison.webp\"\r\n      alt=\"Comparison of ATS AVR UPS and genset controller functions in backup power systems\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption class=\"leeyee-caption\">\r\n      ATS, AVR, UPS and genset controller functions complement each other. Actual integration depends on the selected equipment and project architecture.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"leeyee-table-wrap\">\r\n    <table aria-label=\"ATS AVR UPS and genset controller function comparison\">\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:20%;\">Equipment<\/th>\r\n          <th style=\"width:32%;\">Main responsibility<\/th>\r\n          <th style=\"width:48%;\">What it does not replace<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Equipment\">ATS<\/td>\r\n          <td data-label=\"Main responsibility\">Automatic source monitoring and load transfer<\/td>\r\n          <td data-label=\"Does not replace\">Generator AVR, UPS ride-through function or genset engine control<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Equipment\">AVR<\/td>\r\n          <td data-label=\"Main responsibility\">Alternator excitation and voltage regulation<\/td>\r\n          <td data-label=\"Does not replace\">Automatic transfer between utility and generator<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Equipment\">UPS<\/td>\r\n          <td data-label=\"Main responsibility\">Provides ride-through or uninterrupted power according to UPS topology<\/td>\r\n          <td data-label=\"Does not replace\">General ATS utility-generator transfer function or alternator AVR<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Equipment\">Genset controller<\/td>\r\n          <td data-label=\"Main responsibility\">Engine start\/stop, generator monitoring, alarms and control logic<\/td>\r\n          <td data-label=\"Does not replace\">The physical ATS power-transfer mechanism unless integrated into a complete transfer system<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h3>Where a UPS Fits<\/h3>\r\n\r\n  <p>\r\n    A UPS is especially different from a conventional open-transition ATS. Eaton describes UPS equipment as providing emergency or ride-through power when input power fails, with the exact behaviour depending on UPS topology. [6]\r\n  <\/p>\r\n\r\n  <p>\r\n    Therefore, if a load cannot tolerate the interruption associated with generator starting and open-transition transfer, the project may require a UPS or another continuity solution in addition to the ATS.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-does-a-generator-system-need-an-avr\"><\/span>When Does a Generator System Need an AVR?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>First Check the Generator Design<\/h3>\r\n\r\n  <p>\r\n    The correct question is usually not \u201cShould I install an AVR after the ATS?\u201d Instead, first determine <strong>how the generator alternator regulates its output voltage<\/strong>.\r\n  <\/p>\r\n\r\n  <p>\r\n    Generator alternators commonly incorporate an AVR as part of the excitation system. For example, STAMFORD documentation describes both self-excited and PMG-excited AVR arrangements and treats the AVR as part of alternator voltage control. [3]\r\n  <\/p>\r\n\r\n  <h3>Then Check the Actual Operating Problem<\/h3>\r\n\r\n  <ul class=\"leeyee-decision-list\">\r\n    <li>\r\n      <strong>If the alternator already includes the correct AVR:<\/strong> the project may not require a separately purchased external AVR. Therefore, confirm the generator and alternator documentation first.\r\n    <\/li>\r\n    <li>\r\n      <strong>If generator voltage cannot remain within the required range:<\/strong> investigate the generator, alternator, excitation\/AVR system and load response instead of expecting the ATS to fix the voltage.\r\n    <\/li>\r\n    <li>\r\n      <strong>If large motor, transformer or difficult nonlinear loads are involved:<\/strong> confirm generator and alternator performance for the actual load characteristics. In addition, do not select the system from ATS rated current alone.\r\n    <\/li>\r\n    <li>\r\n      <strong>If the problem is unstable frequency:<\/strong> investigate engine speed, governor\/control behaviour and loading conditions as well as ATS source sensing. [7]\r\n    <\/li>\r\n  <\/ul>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-can-you-buy-an-ats-without-buying-a-separate-avr\"><\/span>When Can You Buy an ATS Without Buying a Separate AVR?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>When the Generator Already Includes Voltage Regulation<\/h3>\r\n\r\n  <p>\r\n    A project can require an ATS even when the buyer does not need to purchase a separate standalone AVR. For example, the generator set may already use an alternator with a manufacturer-designed AVR or another appropriate voltage-regulation arrangement.\r\n  <\/p>\r\n\r\n  <h3>How the Procurement Scope May Be Split<\/h3>\r\n\r\n  <p>\r\n    In that case, a typical procurement split may include:\r\n  <\/p>\r\n\r\n  <ul>\r\n    <li>Generator set with engine, alternator, voltage regulation and genset control.<\/li>\r\n    <li>ATS for utility-generator source monitoring and transfer.<\/li>\r\n    <li>UPS only where the load needs additional ride-through or uninterrupted continuity.<\/li>\r\n    <li>Distribution and protective devices selected for the complete electrical design.<\/li>\r\n  <\/ul>\r\n\r\n  <p>\r\n    However, this architecture is not universal. Some systems integrate several control functions into one panel, while others use separate ATS and generator controllers. Therefore, confirm the single-line diagram, generator interface and sequence of operation before ordering.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-should-you-check-before-selecting-a-generator-ats\"><\/span>What Should You Check Before Selecting a Generator ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Do Not Select by Current Alone<\/h3>\r\n\r\n  <p>\r\n    ATS selection should not be based only on generator kVA or one current value. Instead, the transfer switch must match the electrical system, switching arrangement, control interface and load requirements.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-figure leeyee-figure-wide\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/generator-ats-selection-information-checklist.webp\"\r\n      alt=\"Generator ATS selection information checklist for backup power projects\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption class=\"leeyee-caption\">\r\n      Information to prepare before ATS model confirmation. Controller sensing ranges, delays and interfaces must match the actual ATS and generator system.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <section class=\"leeyee-checklist\" aria-labelledby=\"ats-ordering-checklist\">\r\n    <h3 id=\"ats-ordering-checklist\">Generator ATS Project Confirmation Checklist<\/h3>\r\n\r\n    <p>\r\n      Before requesting a model recommendation, prepare these details:\r\n    <\/p>\r\n\r\n    <div class=\"leeyee-checklist-grid\">\r\n      <div class=\"leeyee-check-item\">Normal source rated voltage<\/div>\r\n      <div class=\"leeyee-check-item\">Generator rated output voltage<\/div>\r\n      <div class=\"leeyee-check-item\">50 Hz or 60 Hz system<\/div>\r\n      <div class=\"leeyee-check-item\">Single-phase or three-phase<\/div>\r\n      <div class=\"leeyee-check-item\">Required ATS rated current<\/div>\r\n      <div class=\"leeyee-check-item\">2P, 3P or 4P configuration<\/div>\r\n      <div class=\"leeyee-check-item\">Neutral and earthing arrangement<\/div>\r\n      <div class=\"leeyee-check-item\">Generator start interface<\/div>\r\n      <div class=\"leeyee-check-item\">Load type and starting characteristics<\/div>\r\n      <div class=\"leeyee-check-item\">Required source-sensing functions<\/div>\r\n      <div class=\"leeyee-check-item\">Transfer and retransfer logic<\/div>\r\n      <div class=\"leeyee-check-item\">Auto \/ Manual requirement<\/div>\r\n      <div class=\"leeyee-check-item\">Required dry contacts or communication<\/div>\r\n      <div class=\"leeyee-check-item\">Required standards and project documents<\/div>\r\n      <div class=\"leeyee-check-item\">Quantity<\/div>\r\n      <div class=\"leeyee-check-item\">OEM \/ private-label requirement<\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"three-common-ats-and-avr-specification-mistakes\"><\/span>Three Common ATS and AVR Specification Mistakes<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>Mistake 1: \u201cThe Generator Has AVR, So I Do Not Need ATS.\u201d<\/h3>\r\n\r\n  <p>\r\n    An AVR does not transfer the load between utility and generator. Therefore, a generator may have correctly regulated output voltage and still require an ATS wherever the project needs automatic source changeover.\r\n  <\/p>\r\n\r\n  <h3>Mistake 2: \u201cThe ATS Will Stabilize Bad Generator Voltage.\u201d<\/h3>\r\n\r\n  <p>\r\n    The ATS can monitor source conditions and delay or prevent transfer when the generator does not satisfy its configured acceptance logic. However, it does not regulate alternator excitation or repair unstable generator voltage. [2][3][4]\r\n  <\/p>\r\n\r\n  <h3>Mistake 3: \u201cAVR Controls Generator Frequency Too.\u201d<\/h3>\r\n\r\n  <p>\r\n    AVR and frequency control are different functions. The AVR regulates alternator voltage through excitation. By contrast, generator frequency is linked to rotational speed and therefore involves engine speed, governor behaviour and genset control performance. [7]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"where-leeyee-fits-into-a-generator-backup-system\"><\/span>Where LEEYEE Fits Into a Generator Backup System<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <h3>The LEEYEE Product in This Application<\/h3>\r\n\r\n  <p>\r\n    LEEYEE supplies the <strong>compact integrated automatic transfer switch itself<\/strong> for this type of application. The ATS switches the load between two power sources according to its controller logic. Therefore, it should not be confused with an AVR, UPS, complete generator controller or complete backup-power cabinet.\r\n  <\/p>\r\n\r\n  <figure class=\"leeyee-product-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE compact integrated automatic transfer switch\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\"\r\n    >\r\n    <figcaption class=\"leeyee-caption\">\r\n      Actual LEEYEE compact integrated ATS product. This is the type of transfer-switch hardware discussed in this guide.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <section class=\"leeyee-scope\">\r\n    <div class=\"leeyee-scope-title\">LEEYEE Supply Scope<\/div>\r\n\r\n    <p>\r\n      LEEYEE supplies <strong>compact integrated automatic transfer switches<\/strong> for low-voltage source-transfer applications, including utility-generator backup arrangements where the selected ATS configuration matches the project requirements.\r\n    <\/p>\r\n\r\n    <p>\r\n      Depending on the actual product specification and electrical system, project selection can involve single-phase or three-phase systems and 2P, 3P or 4P configurations. In addition, the standard LEEYEE ATS offering primarily focuses on ordinary <strong>open-transition transfer<\/strong>.\r\n    <\/p>\r\n\r\n    <p>\r\n      LEEYEE does not present this ATS as an AVR, UPS, complete generator set, complete generator control cabinet, bypass-isolation ATS or complete backup-power system.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <h3>What Still Requires Project Confirmation<\/h3>\r\n\r\n  <p>\r\n    For a generator project, confirm the ATS together with generator characteristics and the required sequence of operation. In particular, verify the selected model\u2019s sensing capability, controller settings, generator-start interface, pole configuration, rated current and communication functions against the applicable LEEYEE product documentation before project approval.\r\n  <\/p>\r\n\r\n  <div class=\"leeyee-engineering-note\">\r\n    <p>\r\n      <strong>Project boundary:<\/strong> the diagrams in this guide explain system relationships. They are not project wiring drawings. Therefore, determine final wiring, protection, neutral treatment, source sensing, generator start\/stop logic and commissioning values from the actual equipment documentation, applicable standards and approved project design.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-cta\" aria-labelledby=\"ats-project-review\">\r\n    <h2 id=\"ats-project-review\"><span class=\"ez-toc-section\" id=\"need-to-confirm-an-ats-for-your-generator-system\"><\/span>Need to Confirm an ATS for Your Generator System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <p>\r\n      Share the normal-source voltage, generator voltage, frequency, phase arrangement, rated current, pole requirement, load type and generator start interface. LEEYEE can then help confirm whether a compact ATS configuration fits your source-transfer requirement.\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=\"Share Your Generator ATS Requirements\">\r\n      <span class=\"w-btn-label\">Share Your Generator ATS Requirements<\/span>\r\n    <\/button>\r\n  <\/section>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"frequently-asked-questions\"><\/span>Frequently Asked Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"leeyee-faq\">\r\n\r\n    <details>\r\n      <summary>Is ATS the same as AVR on a generator?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          No. An ATS transfers a load between available power sources. By contrast, a generator AVR regulates alternator output voltage through the excitation system. Therefore, the two devices solve different problems. [1][3]\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can an ATS work with a generator that already has an AVR?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Yes, provided the generator and ATS are electrically and functionally compatible with the project. The AVR regulates generator voltage, while the ATS manages source transfer. Therefore, confirm voltage, frequency, phase arrangement, start interface and controller settings before commissioning.\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does every generator backup system need a separate external AVR?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          No. Many alternators already incorporate an AVR as part of the excitation system. Therefore, whether another regulator is required depends on the generator and alternator design. Check the genset documentation instead of assuming an additional external AVR is necessary. [3]\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What happens if generator voltage is too low when the ATS wants to transfer?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          If the ATS controller supports and uses voltage qualification, an unacceptable emergency-source voltage can prevent or delay transfer. However, the actual threshold and timing depend on the selected controller and project settings. The generator-side low-voltage condition still requires investigation. [2][4]\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can AVR fix unstable generator frequency?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Not as its primary function. The AVR regulates alternator voltage through excitation. By contrast, frequency follows generator rotational speed. Therefore, unstable frequency requires review of engine speed, governor\/control behaviour, load conditions and the complete genset configuration. [7]\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Can an ATS replace a UPS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Not when the load requires stored-energy ride-through or uninterrupted power during generator starting and open-transition transfer. The ATS changes the load between sources. A UPS, by contrast, can support the load during an input interruption according to its topology and energy-storage design. [6]\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>Does the ATS controller start the generator?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          In many utility-generator systems, the ATS or associated transfer controller can issue a generator-start request. The genset controller then manages engine and generator control functions. However, the exact interface depends on the selected ATS and genset controller. [2][5]\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n    <details>\r\n      <summary>What information should I provide when ordering a generator ATS?<\/summary>\r\n      <div class=\"leeyee-faq-answer\">\r\n        <p>\r\n          Provide normal-source voltage, generator voltage, frequency, phase arrangement, rated current, pole configuration, neutral arrangement, generator-start interface and load type. In addition, specify required sensing, delay, dry-contact, communication, standards and OEM requirements where applicable.\r\n        <\/p>\r\n      <\/div>\r\n    <\/details>\r\n\r\n  <\/div>\r\n\r\n  <section class=\"leeyee-references\" aria-labelledby=\"references\">\r\n    <h2 id=\"references\"><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>\r\n        <span class=\"leeyee-reference-title\">[1] International Electrotechnical Commission (IEC).<\/span>\r\n        IEC 60947-6-1:2026, <em>Low-voltage switchgear and controlgear \u2013 Part 6-1: Multiple function equipment \u2013 Transfer switching equipment.<\/em>\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">Official IEC publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"leeyee-reference-title\">[2] Eaton.<\/span>\r\n        <em>Fundamentals of Automatic Transfer Switches (ATS).<\/em>\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\">Eaton technical resource<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"leeyee-reference-title\">[3] STAMFORD | AvK, Cummins Generator Technologies.<\/span>\r\n        <em>Automatic Voltage Regulator Technical Documentation.<\/em>\r\n        <a href=\"https:\/\/www.stamford-avk.com\/downloads\/avr-manuals\" target=\"_blank\" rel=\"noopener noreferrer\">Official AVR manuals<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"leeyee-reference-title\">[4] Eaton.<\/span>\r\n        <em>Automatic Transfer Switch, Type ATS-PWR.<\/em>\r\n        <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/low-voltage-power-distribution-controls-systems\/%E4%BD%8E%E5%8E%8B%E5%BC%80%E5%85%B3%E6%9F%9C\/power-xpert-cx\/br08703001ud-v2-ats.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton ATS technical document<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"leeyee-reference-title\">[5] Deep Sea Electronics.<\/span>\r\n        <em>DSE7320 MKII Auto Mains (Utility) Failure Control Module.<\/em>\r\n        <a href=\"https:\/\/www.deepseaelectronics.com\/genset\/auto-mains-utility-failure-control-modules\/dse7320-mkii\" target=\"_blank\" rel=\"noopener noreferrer\">Deep Sea Electronics documentation<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"leeyee-reference-title\">[6] Eaton.<\/span>\r\n        <em>Uninterruptible Power Supply (UPS) FAQs.<\/em>\r\n        <a href=\"https:\/\/www.eaton.com\/sg\/en-us\/products\/backup-power-ups-surge-it-power-distribution\/backup-power-ups\/uninterruptible-power-supply-faq.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton UPS technical resource<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        <span class=\"leeyee-reference-title\">[7] Cummins Power Generation.<\/span>\r\n        <em>Gas Power Plant Application Manual.<\/em>\r\n        <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2024-08\/t035-Gas-Power-Plant-application-manual.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Cummins technical manual<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <p class=\"leeyee-small-note\">\r\n      Standards, product capabilities and controller settings can vary by edition, model and market. Therefore, confirm current equipment datasheets, approved project documents and applicable local requirements before final design or commissioning.\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>Generator Backup System GuideAn automatic transfer switch (ATS) and a generator automatic voltage regulator (AVR) solve two different problems in a backup power system. The ATS determines which source feeds the load. By contrast, the AVR controls alternator excitation to help maintain generator output voltage. Therefore, one cannot replace the other. [1][2][3] For generator integrators,&#8230;<\/p>\n","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-31681","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>ATS vs AVR for Generator Backup Systems | LEEYEE<\/title>\n<meta name=\"description\" content=\"Understand ATS vs AVR in generator backup systems, how generator voltage regulation and source transfer work together, and what B2B buyers should confirm before selecting an ATS.\" \/>\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\/it\/ats-and-avr-generator-systems\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ATS vs AVR for Generator Backup Systems | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Understand ATS vs AVR in generator backup systems, how generator voltage regulation and source transfer work together, and what B2B buyers should confirm before selecting an ATS.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/it\/ats-and-avr-generator-systems\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - 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