{"id":31758,"date":"2026-10-24T15:05:07","date_gmt":"2026-10-24T07:05:07","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31758"},"modified":"2026-10-24T15:05:54","modified_gmt":"2026-10-24T07:05:54","slug":"how-to-read-an-ats-datasheet-before-ordering","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/th\/how-to-read-ats-datasheet\/","title":{"rendered":"How to Read an ATS Datasheet Before Ordering"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31758\" class=\"elementor elementor-31758\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b155bd e-flex e-con-boxed e-con e-parent\" data-id=\"2b155bd\" 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-5b7cf67 elementor-widget elementor-widget-html\" data-id=\"5b7cf67\" data-element_type=\"widget\" data-e-type=\"widget\" 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}\r\n\r\n  .leeyee-ats-datasheet-guide .ly-checklist{\r\n    grid-template-columns:1fr;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide table,\r\n  .leeyee-ats-datasheet-guide thead,\r\n  .leeyee-ats-datasheet-guide tbody,\r\n  .leeyee-ats-datasheet-guide tr,\r\n  .leeyee-ats-datasheet-guide th,\r\n  .leeyee-ats-datasheet-guide td{\r\n    display:block;\r\n    width:100%;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide thead{\r\n    position:absolute;\r\n    width:1px;\r\n    height:1px;\r\n    margin:-1px;\r\n    padding:0;\r\n    overflow:hidden;\r\n    clip:rect(0 0 0 0);\r\n    white-space:nowrap;\r\n    border:0;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide tbody tr{\r\n    margin:0 0 14px;\r\n    border:1px solid var(--ly-line);\r\n    border-radius:8px;\r\n    overflow:hidden;\r\n    background:#fff;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide tbody tr:nth-child(even){\r\n    background:#fff;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide td{\r\n    position:relative;\r\n    padding:10px 12px 11px;\r\n    border:0;\r\n    border-bottom:1px solid var(--ly-line);\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide td:last-child{\r\n    border-bottom:0;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide td::before{\r\n    content:attr(data-label);\r\n    display:block;\r\n    margin-bottom:3px;\r\n    color:var(--ly-blue);\r\n    font-size:13px;\r\n    line-height:1.35;\r\n    font-weight:700;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide .leeyee-about-btn-light{\r\n    width:100%;\r\n    min-height:50px;\r\n    padding-left:17px;\r\n    padding-right:17px;\r\n  }\r\n}\r\n\r\n@media (max-width:390px){\r\n  .leeyee-ats-datasheet-guide{\r\n    padding-left:13px;\r\n    padding-right:13px;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide h2{\r\n    font-size:24px;\r\n  }\r\n\r\n  .leeyee-ats-datasheet-guide .ly-buyer-note,\r\n  .leeyee-ats-datasheet-guide .ly-engineering-note,\r\n  .leeyee-ats-datasheet-guide .ly-warning,\r\n  .leeyee-ats-datasheet-guide .ly-scope,\r\n  .leeyee-ats-datasheet-guide .ly-review-path{\r\n    padding:16px;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-ats-datasheet-guide\">\r\n\r\n  <p class=\"ly-intro\">\r\n    An ATS datasheet is not just a list of ratings. For a distributor, panel builder, generator-set integrator, electrical contractor or OEM buyer, it is a project-compatibility document. The correct way to read it is to compare the automatic transfer switch specifications with the single-line diagram, load, upstream protection, control requirements and project specification before the purchase order is confirmed.\r\n  <\/p>\r\n\r\n  <section class=\"ly-quick-answer\">\r\n    <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_89 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\/th\/how-to-read-ats-datasheet\/#quick-answer-what-should-you-check-first\" >Quick Answer: What Should You Check First?<\/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\/th\/how-to-read-ats-datasheet\/#1-start-with-the-project-not-the-ats-model-number\" >1. Start With the Project, Not the ATS Model Number<\/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\/th\/how-to-read-ats-datasheet\/#2-rated-current-check-the-ats-feeder-not-just-the-generator-nameplate\" >2. Rated Current: Check the ATS Feeder, Not Just the Generator Nameplate<\/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\/th\/how-to-read-ats-datasheet\/#3-read-2p-3p-and-4p-together-with-the-neutral-design\" >3. Read 2P, 3P and 4P Together With the Neutral Design<\/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\/th\/how-to-read-ats-datasheet\/#4-ue-ui-and-uimp-are-three-different-voltage-ratings\" >4. Ue, Ui and Uimp Are Three Different Voltage Ratings<\/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\/th\/how-to-read-ats-datasheet\/#5-frequency-and-voltage-must-match-the-actual-sources\" >5. Frequency and Voltage Must Match the Actual Sources<\/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\/th\/how-to-read-ats-datasheet\/#6-utilization-category-tells-you-the-switching-duty-behind-the-current-rating\" >6. Utilization Category Tells You the Switching Duty Behind the Current Rating<\/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\/th\/how-to-read-ats-datasheet\/#7-pc-class-and-cb-class-affect-the-protection-review\" >7. PC Class and CB Class Affect the Protection Review<\/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\/th\/how-to-read-ats-datasheet\/#8-short-circuit-capability-cannot-be-judged-by-one-ka-number\" >8. Short-Circuit Capability Cannot Be Judged by One kA Number<\/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\/th\/how-to-read-ats-datasheet\/#9-transfer-time-operation-time-and-controller-delay-are-not-the-same-parameter\" >9. Transfer Time, Operation Time and Controller Delay Are Not the Same Parameter<\/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\/th\/how-to-read-ats-datasheet\/#10-control-voltage-sensing-voltage-and-remote-signals-need-model-specific-verification\" >10. Control Voltage, Sensing Voltage and Remote Signals Need Model-Specific Verification<\/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\/th\/how-to-read-ats-datasheet\/#11-power-terminals-and-control-terminals-answer-different-questions\" >11. Power Terminals and Control Terminals Answer Different Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/how-to-read-ats-datasheet\/#12-do-not-ignore-installation-environmental-and-durability-data\" >12. Do Not Ignore Installation, Environmental and Durability Data<\/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\/th\/how-to-read-ats-datasheet\/#13-datasheet-certificate-and-test-report-are-not-the-same-evidence\" >13. Datasheet, Certificate and Test Report Are Not the Same Evidence<\/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\/th\/how-to-read-ats-datasheet\/#14-how-should-iec-60947-6-1-be-read-on-an-ats-datasheet\" >14. How Should IEC 60947-6-1 Be Read on an ATS Datasheet?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/how-to-read-ats-datasheet\/#15-compare-the-datasheet-with-the-single-line-diagram-and-project-specification\" >15. Compare the Datasheet With the Single-Line Diagram and Project Specification<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/how-to-read-ats-datasheet\/#16-what-must-be-reconfirmed-before-ordering\" >16. What Must Be Reconfirmed Before Ordering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/how-to-read-ats-datasheet\/#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-19\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/th\/how-to-read-ats-datasheet\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"quick-answer-what-should-you-check-first\"><\/span>Quick Answer: What Should You Check First?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n    <p>\r\n      Start with the <strong>actual electrical system<\/strong>. Verify rated operational current, rated operational voltage, frequency and pole configuration first. Then review utilization category, PC or CB classification, short-circuit data, transition method, timing, control and status interfaces, terminal information and environmental limits. Finally, compare the exact ATS configuration with the single-line diagram, project specification and applicable certificate or technical-document scope. [1][2]\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <figure class=\"ly-figure ly-product-photo\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/06\/2.png\"\r\n      alt=\"LEEYEE compact 2P and 4P automatic transfer switches with auto manual control\"\r\n      loading=\"eager\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      LEEYEE compact ATS products in 2P and 4P configurations. The front panel shows two-source identification, load output and Auto\/Manual operation. Exact current, voltage, control-interface, short-circuit and certification data must be confirmed from the model-specific datasheet.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-review-path\">\r\n    <strong>Recommended ATS datasheet review sequence<\/strong>\r\n    <div class=\"ly-path-text\">\r\n      System \u2192 Current \u2192 Ue \/ frequency \u2192 Poles and neutral \u2192 Utilization category \u2192 PC \/ CB class \u2192 Short-circuit coordination \u2192 Transition and timing \u2192 Control signals \u2192 Terminals \u2192 Ui \/ Uimp \u2192 Installation and environment \u2192 Standards and document scope \u2192 Single-line diagram \u2192 Supplier confirmation\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-datasheet-reading-checklist.webp\"\r\n      alt=\"ATS datasheet reading checklist for B2B buyers before ordering\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Read the ATS datasheet as a project approval document: first confirm the power system, then protection and transfer performance, and finally integration, documentation and ordering details.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"1-start-with-the-project-not-the-ats-model-number\"><\/span>1. Start With the Project, Not the ATS Model Number<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Before comparing ATS models, identify where the transfer switch sits in the electrical system. Confirm the normal source, emergency source, load, system voltage, frequency, phase arrangement, neutral arrangement and upstream protective devices.\r\n  <\/p>\r\n\r\n  <p>\r\n    A datasheet describes what a device is designed and rated to do. The single-line diagram and project specification describe what the installation requires. A technically suitable purchase requires those two sides to match.\r\n  <\/p>\r\n\r\n  <div class=\"ly-buyer-note\">\r\n    <strong>Buyer meaning<\/strong>\r\n    Two ATS products can both be marked 100 A and still be unsuitable substitutes if their utilization category, pole configuration, short-circuit conditions, transfer characteristics, control interfaces or certification scope differ.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"2-rated-current-check-the-ats-feeder-not-just-the-generator-nameplate\"><\/span>2. Rated Current: Check the ATS Feeder, Not Just the Generator Nameplate<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Rated operational current is usually one of the first values buyers notice. It should be compared with the design current of the circuit that actually passes through the ATS, not selected only from the equipment name or generator rating.\r\n  <\/p>\r\n\r\n  <p>\r\n    The ATS may serve only part of the generator capacity. The downstream load can also contain motors, transformers, UPS equipment or mixed loads that affect the required switching duty.\r\n  <\/p>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    Read current together with voltage and utilization category rather than as an isolated ampere number.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Datasheet field<\/th>\r\n          <th>What it means<\/th>\r\n          <th>What the buyer should compare<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Datasheet field\">Rated operational current<\/td>\r\n          <td data-label=\"What it means\">Declared current capability for specified operating conditions<\/td>\r\n          <td data-label=\"What the buyer should compare\">Design current of the ATS feeder<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Datasheet field\">Rated operational voltage<\/td>\r\n          <td data-label=\"What it means\">Voltage associated with the declared operating performance<\/td>\r\n          <td data-label=\"What the buyer should compare\">Normal and emergency source voltage<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Datasheet field\">Utilization category<\/td>\r\n          <td data-label=\"What it means\">Declared switching-duty category<\/td>\r\n          <td data-label=\"What the buyer should compare\">Actual load characteristics<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p class=\"ly-table-note\">\r\n    ABB IEC transfer-switch data illustrates why these fields belong together: current ratings are published together with voltage and utilization-category information rather than as a single universal ampere value. [2]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"3-read-2p-3p-and-4p-together-with-the-neutral-design\"><\/span>3. Read 2P, 3P and 4P Together With the Neutral Design<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Pole count and phase count are related, but they are not identical concepts. A three-phase installation can use a 3-pole or 4-pole transfer arrangement depending on whether the neutral is required to be switched.\r\n  <\/p>\r\n\r\n  <p>\r\n    Eaton notes that a three-phase transfer switch can use a fully rated fourth pole when neutral switching is required, and that switched-neutral arrangements are commonly associated with separately derived sources. [3]\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Project confirmation required<\/strong>\r\n    Do not choose 3P or 4P only because the system is described as \u201cthree-phase four-wire.\u201d Neutral switching must follow the approved grounding, bonding, protection and project design.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"4-ue-ui-and-uimp-are-three-different-voltage-ratings\"><\/span>4. Ue, Ui and Uimp Are Three Different Voltage Ratings<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    One of the easiest mistakes when reading an ATS datasheet is treating every voltage number as the operating voltage.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Symbol<\/th>\r\n          <th>Datasheet meaning<\/th>\r\n          <th>Buyer interpretation<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Symbol\"><strong>Ue<\/strong><\/td>\r\n          <td data-label=\"Datasheet meaning\">Rated operational voltage<\/td>\r\n          <td data-label=\"Buyer interpretation\">Compare with the real system operating voltage<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Symbol\"><strong>Ui<\/strong><\/td>\r\n          <td data-label=\"Datasheet meaning\">Rated insulation voltage<\/td>\r\n          <td data-label=\"Buyer interpretation\">Relates to insulation design; it is not the normal operating voltage<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Symbol\"><strong>Uimp<\/strong><\/td>\r\n          <td data-label=\"Datasheet meaning\">Rated impulse withstand voltage<\/td>\r\n          <td data-label=\"Buyer interpretation\">Relates to specified impulse withstand capability, not continuous operation<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    ABB TruONE technical data, for example, lists Ue, Ui and Uimp as separate specifications. This makes an important procurement point: a high Ui or Uimp value does not mean the ATS is intended to operate continuously at that voltage. [2]\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"5-frequency-and-voltage-must-match-the-actual-sources\"><\/span>5. Frequency and Voltage Must Match the Actual Sources<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Check the operating voltage and frequency of both sources. A transfer switch used between utility and generator supplies must be compatible with the electrical conditions the controller and switching mechanism are expected to see.\r\n  <\/p>\r\n\r\n  <p>\r\n    Do not assume that every value in a multi-voltage datasheet applies identically at every voltage. Current ratings, utilization categories and short-circuit performance may be declared under defined voltage conditions. [2]\r\n  <\/p>\r\n\r\n  <div class=\"ly-buyer-note\">\r\n    <strong>Buyer meaning<\/strong>\r\n    \u201c400 V ATS\u201d is not a complete purchase specification. Frequency, poles, load duty, controller requirements and source sensing can still affect the correct configuration.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"6-utilization-category-tells-you-the-switching-duty-behind-the-current-rating\"><\/span>6. Utilization Category Tells You the Switching Duty Behind the Current Rating<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC-type ATS datasheets can show utilization categories such as AC-31 or AC-33 variants. These categories help identify the switching duty for which performance is declared.\r\n  <\/p>\r\n\r\n  <p>\r\n    ABB technical tables publish operational-current and switching data by utilization category, showing why two products with the same nominal ampere number should not be compared until the applicable duty category is checked. [2]\r\n  <\/p>\r\n\r\n  <div class=\"ly-engineering-note\">\r\n    <strong>Engineering meaning<\/strong>\r\n    Do not compare \u201c100 A versus 100 A\u201d until you know whether the voltage and utilization category being compared are equivalent for the project.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"7-pc-class-and-cb-class-affect-the-protection-review\"><\/span>7. PC Class and CB Class Affect the Protection Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    ATS classification affects how the transfer equipment fits into the protection scheme. IEC 60947-6-1 includes transfer switching equipment requirements and also addresses performance requirements for CB-type TSE in alignment with circuit-breaker requirements. [1]\r\n  <\/p>\r\n\r\n  <p>\r\n    For PC-class equipment, the manufacturer's declared conditional short-circuit and withstand data should be read together with the upstream protective-device information. ABB's IEC Class PC technical tables, for example, list conditional short-circuit current, corresponding fuses or circuit breakers and short-time withstand current as separate parameters. [2]\r\n  <\/p>\r\n\r\n  <div class=\"ly-scope\">\r\n    <strong>LEEYEE standard product scope<\/strong>\r\n    LEEYEE's standard ATS range focuses on compact integrated <strong>2P and 4P transfer switches<\/strong> for ordinary <strong>open-transition<\/strong> applications, with standard mass-production products primarily using <strong>PC-class architecture<\/strong>. Project-specific current, voltage, control-interface, short-circuit and certification scope must still be confirmed from the exact model datasheet. Closed-transition, bypass-isolation and large ATS cabinet arrangements must not be assumed to be standard stock configurations.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"8-short-circuit-capability-cannot-be-judged-by-one-ka-number\"><\/span>8. Short-Circuit Capability Cannot Be Judged by One kA Number<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Short-circuit data is one of the most important\u2014and most easily misread\u2014parts of an ATS datasheet.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-short-circuit-rating-upstream-protection.webp\"\r\n      alt=\"ATS short-circuit rating and upstream protective device coordination diagram\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      ATS short-circuit performance must be checked together with the available fault current and the upstream protective device specified for the rating.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>\r\n    An IEC datasheet can include <strong>conditional short-circuit current Iq<\/strong>, <strong>short-time withstand current Icw<\/strong> and <strong>making-capacity data<\/strong>. These values describe different characteristics and must not be treated as interchangeable. ABB technical data publishes Iq, Icw and Icm separately and associates conditional ratings with specified protective devices. [2]\r\n  <\/p>\r\n\r\n  <p>\r\n    The same coordination principle is important in other standards systems. Eaton explains that transfer-switch withstand and closing ratings must be considered together with available fault current and the overcurrent protective device that clears the fault. [4]\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Before accepting a kA value, confirm five things<\/strong>\r\n    What does the value represent? At what voltage does it apply? Is a duration specified? Does it depend on a particular fuse or circuit breaker? Does that protective device match the actual project?\r\n  <\/div>\r\n\r\n  <div class=\"ly-buyer-note\">\r\n    <strong>Buyer meaning<\/strong>\r\n    A larger kA number is not automatically the better ATS. Compare the definition, voltage, duration, test condition and upstream-protection requirement before comparing products.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"9-transfer-time-operation-time-and-controller-delay-are-not-the-same-parameter\"><\/span>9. Transfer Time, Operation Time and Controller Delay Are Not the Same Parameter<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Datasheets can list contact transfer time, operating transfer time and controller delay settings separately. The exact terminology varies by manufacturer, so the definition attached to each value matters.\r\n  <\/p>\r\n\r\n  <p>\r\n    ABB technical data, for example, lists contact transfer time and operating transfer time separately. [2] In a generator-backed system, the complete interruption seen by the load can also include source-failure detection, generator starting, voltage and frequency acceptance, intentional delays and mechanical transfer.\r\n  <\/p>\r\n\r\n  <div class=\"ly-mini-flow\">\r\n    <strong>Typical sequence<\/strong><br>\r\n    Normal source fails \u2192 controller confirms the abnormal condition \u2192 generator start command is issued where applicable \u2192 emergency source reaches acceptable conditions \u2192 transfer is initiated \u2192 switching mechanism changes source\r\n  <\/div>\r\n\r\n  <p>\r\n    A small mechanical or contact-transfer-time number therefore should not automatically be presented as the total time from utility failure to restored generator supply.\r\n  <\/p>\r\n\r\n  <h3>What does open transition mean?<\/h3>\r\n\r\n  <p>\r\n    Open transition is a break-before-make transfer: the ATS disconnects from one source before connecting the load to the other. Eaton describes open transition using this same break-before-make principle. [5]\r\n  <\/p>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 separately includes requirements for bypass\/isolation transfer switch equipment in Annex C and closed-transition ATSE in Annex D. [1] Those functions therefore should not be assumed from a standard compact open-transition ATS datasheet.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"10-control-voltage-sensing-voltage-and-remote-signals-need-model-specific-verification\"><\/span>10. Control Voltage, Sensing Voltage and Remote Signals Need Model-Specific Verification<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The power-circuit voltage does not tell you everything about the ATS controller. Depending on the product design, controller supply, actuator supply and source-sensing ranges can be specified separately.\r\n  <\/p>\r\n\r\n  <p>\r\n    Check how the selected ATS monitors the normal and emergency sources and whether any external control supply is required. If the datasheet does not answer this clearly, request the model-specific wiring diagram or installation manual before production.\r\n  <\/p>\r\n\r\n  <p>\r\n    Generator-set and BMS integration also require a separate review of dry contacts and auxiliary outputs. Typical project points can include generator start, Normal Available, Emergency Available, Load to Normal, Load to Emergency, operating mode and fault indication.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Do not assume every signal exists on every model<\/strong>\r\n    A front-panel indication does not automatically mean that the same status is available as a remote dry contact. Confirm terminal function, NO\/NC\/COM definition where applicable, contact rating and required accessories from the selected model documentation.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"11-power-terminals-and-control-terminals-answer-different-questions\"><\/span>11. Power Terminals and Control Terminals Answer Different Questions<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A wiring diagram and a terminal schedule are not the same thing. The wiring diagram explains electrical relationships. Terminal information tells the panel builder what can physically and electrically be connected to the ATS.\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th>Terminal information<\/th>\r\n          <th>What to check<\/th>\r\n          <th>Why procurement cares<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Terminal information\">Main power terminals<\/td>\r\n          <td data-label=\"What to check\">Source, load and neutral identification<\/td>\r\n          <td data-label=\"Why procurement cares\">Prevents panel layout and connection mistakes<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Terminal information\">Conductor range<\/td>\r\n          <td data-label=\"What to check\">Permitted cable or busbar arrangement<\/td>\r\n          <td data-label=\"Why procurement cares\">Confirms connection compatibility<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Terminal information\">Bolt \/ terminal size<\/td>\r\n          <td data-label=\"What to check\">Mechanical connection specification<\/td>\r\n          <td data-label=\"Why procurement cares\">Affects lugs, busbars and assembly preparation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Terminal information\">Tightening torque<\/td>\r\n          <td data-label=\"What to check\">Manufacturer-specified assembly torque<\/td>\r\n          <td data-label=\"Why procurement cares\">Must be followed during installation<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Terminal information\">Control terminals<\/td>\r\n          <td data-label=\"What to check\">Start, status, alarm and auxiliary functions<\/td>\r\n          <td data-label=\"Why procurement cares\">Determines generator, PLC and BMS integration<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <p>\r\n    Real ATS technical documentation can include conductor cross-section, terminal bolt size and tightening torque alongside electrical ratings. ABB's TruONE data is one example. [2] These values are model-specific and should never be copied from another ATS family.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"12-do-not-ignore-installation-environmental-and-durability-data\"><\/span>12. Do Not Ignore Installation, Environmental and Durability Data<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Some datasheet fields do not determine the first model shortlist, but they can decide whether the selected ATS can actually be built into the panel and accepted for the site.\r\n  <\/p>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <div class=\"ly-check-item\">\r\n      <strong>Dimensions<\/strong>\r\n      Confirm that the switch fits the allocated panel space and mounting arrangement.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Weight<\/strong>\r\n      Relevant to enclosure design, mounting and handling.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Operating temperature<\/strong>\r\n      Compare the declared conditions with the real panel and site environment.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>IP \/ enclosure information<\/strong>\r\n      Check whether the rating applies to the device itself or to a complete enclosure.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Mechanical endurance<\/strong>\r\n      Shows declared operating-cycle capability under the manufacturer's test conditions.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Electrical endurance<\/strong>\r\n      Where specified, review it together with the declared operating duty.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p>\r\n    ABB ATS technical documentation illustrates this broader datasheet structure by publishing dimensions, weight, mechanical endurance and connection information in addition to core electrical ratings. [2]\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Do not transfer environmental ratings between models<\/strong>\r\n    An operating-temperature range, IP rating, endurance value or installation limit must come from the exact product documentation being reviewed.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"13-datasheet-certificate-and-test-report-are-not-the-same-evidence\"><\/span>13. Datasheet, Certificate and Test Report Are Not the Same Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Buyers often receive several technical documents with an ATS quotation. They should not be treated as interchangeable.\r\n  <\/p>\r\n\r\n  <div class=\"ly-three-docs\">\r\n    <div class=\"ly-doc\">\r\n      <strong>Datasheet<\/strong>\r\n      Describes the manufacturer's declared specifications, functions and application limits for the product or product family.\r\n    <\/div>\r\n\r\n    <div class=\"ly-doc\">\r\n      <strong>Certificate \/ Declaration<\/strong>\r\n      Shows the model or product scope covered by the particular conformity or certification document.\r\n    <\/div>\r\n\r\n    <div class=\"ly-doc\">\r\n      <strong>Test Report<\/strong>\r\n      Records what was tested under defined conditions and against the referenced requirements.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-buyer-note\">\r\n    <strong>A useful procurement distinction<\/strong>\r\n    A datasheet tells you what is declared. A certificate tells you what scope the document covers. A test report tells you what was tested and under which stated conditions. Always compare the exact model designation and scope rather than relying only on a standard number or certification logo.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"14-how-should-iec-60947-6-1-be-read-on-an-ats-datasheet\"><\/span>14. How Should IEC 60947-6-1 Be Read on an ATS Datasheet?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    IEC 60947-6-1:2026 is the current fourth edition of the IEC standard for transfer switching equipment. It was published on 2 April 2026 and replaced the 2021 edition. Its scope covers manually operated, remotely operated and automatic transfer switching equipment, and the 2026 edition adds or clarifies dedicated requirements for bypass\/isolation equipment, closed-transition ATSE and stand-alone ATS controllers. [1]\r\n  <\/p>\r\n\r\n  <p>\r\n    Seeing \u201cIEC 60947-6-1\u201d on a catalogue is therefore an important technical reference, but it is not the end of document verification.\r\n  <\/p>\r\n\r\n  <div class=\"ly-buyer-note\">\r\n    <strong>Buyer meaning<\/strong>\r\n    Verify whether the exact ATS model, current range, voltage, pole configuration and other relevant scope items being purchased are covered by the supporting declaration, certificate or report required by the project.\r\n  <\/div>\r\n\r\n  <p>\r\n    If the project requires a particular national adoption, certification scheme or market approval, confirm that requirement separately. A general reference to an IEC standard should not be treated as proof of every destination-market approval.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"15-compare-the-datasheet-with-the-single-line-diagram-and-project-specification\"><\/span>15. Compare the Datasheet With the Single-Line Diagram and Project Specification<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    This is the step that converts datasheet reading into real engineering selection. Put the ATS datasheet beside the approved single-line diagram and check the circuit from both sources through the ATS to the load.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/10\/ats-datasheet-single-line-diagram-cross-check.webp\"\r\n      alt=\"ATS datasheet and single-line diagram cross-check for project selection\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      The datasheet describes device capability. The single-line diagram and project specification define the capability the installation actually requires.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <p class=\"ly-table-intro\">\r\n    The most valuable column below is the final one: these are mismatches that can survive a basic current-and-voltage check.\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 information<\/th>\r\n          <th>ATS datasheet check<\/th>\r\n          <th>Mismatch to catch<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Project information\">Normal \/ emergency source<\/td>\r\n          <td data-label=\"ATS datasheet check\">Ue, frequency, source sensing<\/td>\r\n          <td data-label=\"Mismatch to catch\">Incorrect voltage or sensing arrangement<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">ATS feeder current<\/td>\r\n          <td data-label=\"ATS datasheet check\">Rated operational current<\/td>\r\n          <td data-label=\"Mismatch to catch\">ATS selected only from generator size<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">Neutral arrangement<\/td>\r\n          <td data-label=\"ATS datasheet check\">2P \/ 3P \/ 4P<\/td>\r\n          <td data-label=\"Mismatch to catch\">Wrong switched-neutral assumption<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">Upstream breaker \/ fuse<\/td>\r\n          <td data-label=\"ATS datasheet check\">Iq \/ Icw \/ applicable short-circuit data<\/td>\r\n          <td data-label=\"Mismatch to catch\">kA value used without its protection condition<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">Load characteristics<\/td>\r\n          <td data-label=\"ATS datasheet check\">Utilization category<\/td>\r\n          <td data-label=\"Mismatch to catch\">Same current compared under different duty<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">Generator controller<\/td>\r\n          <td data-label=\"ATS datasheet check\">Start-contact interface<\/td>\r\n          <td data-label=\"Mismatch to catch\">Required dry-contact logic unavailable<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">BMS \/ PLC<\/td>\r\n          <td data-label=\"ATS datasheet check\">Auxiliary and remote outputs<\/td>\r\n          <td data-label=\"Mismatch to catch\">Required feedback signals not provided<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Project information\">Panel design<\/td>\r\n          <td data-label=\"ATS datasheet check\">Dimensions and terminals<\/td>\r\n          <td data-label=\"Mismatch to catch\">Device fits electrically but not physically<\/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: the datasheet should not be approved in isolation. It must be cross-checked against the electrical design and the written project requirements.\r\n  <\/p>\r\n\r\n  <div class=\"ly-scope\">\r\n    <strong>Important LEEYEE project boundary<\/strong>\r\n    If the project specification explicitly requires closed transition, bypass\/isolation or another specialized transfer architecture, do not substitute a standard LEEYEE compact open-transition ATS merely because current and voltage appear to match. The architecture itself is a project requirement.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"16-what-must-be-reconfirmed-before-ordering\"><\/span>16. What Must Be Reconfirmed Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A useful RFQ gives the supplier enough information to confirm the configuration rather than forcing both sides to infer requirements from a model number.\r\n  <\/p>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <div class=\"ly-check-item\">\r\n      <strong>Source arrangement<\/strong>\r\n      Utility-generator, utility-utility or another approved two-source arrangement.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>System voltage<\/strong>\r\n      Include phase configuration and source voltages where relevant.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Frequency<\/strong>\r\n      Confirm the actual project frequency.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Design current<\/strong>\r\n      Provide the ATS feeder requirement rather than only the generator rating.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Pole configuration<\/strong>\r\n      Confirm 2P, 3P or 4P after reviewing the neutral arrangement.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Load characteristics<\/strong>\r\n      Identify significant motor, transformer, UPS or mixed-load requirements.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Upstream protection<\/strong>\r\n      Provide breaker or fuse information for coordination review.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Fault-current information<\/strong>\r\n      Provide available project fault-current data where known.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Transition requirement<\/strong>\r\n      Confirm that ordinary open transition is acceptable.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Generator start<\/strong>\r\n      Define the required start-contact interface and logic.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Remote signals<\/strong>\r\n      List the exact BMS \/ PLC status and alarm points required.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Terminal requirements<\/strong>\r\n      Confirm conductor, busbar and control-terminal requirements where important.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Standard \/ certificate<\/strong>\r\n      State the project and destination-market documentation requirements.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Installation conditions<\/strong>\r\n      Provide relevant enclosure, temperature and installation constraints.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>Quantity<\/strong>\r\n      Include sample, approval and production quantities where relevant.\r\n    <\/div>\r\n\r\n    <div class=\"ly-check-item\">\r\n      <strong>OEM requirement<\/strong>\r\n      Define label, packaging and documentation requirements.\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <section class=\"ly-cta\">\r\n    <h3>Need a Model Check Before You Place the ATS Order?<\/h3>\r\n    <p>\r\n      Send the single-line diagram, system voltage, design current, required poles, upstream protective device, transition requirement and control-signal list. LEEYEE can review whether the requested compact open-transition ATS configuration fits the intended product and 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 ATS Datasheet Review\">\r\n      <span class=\"w-btn-label\">Request ATS Datasheet Review<\/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=\"ly-faq\">\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is rated current enough to choose an ATS?<\/h3>\r\n      <p>\r\n        No. Rated current should be checked together with voltage, utilization category, poles, short-circuit requirements, upstream protection, load characteristics and the actual circuit served by the ATS.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>What is the difference between Ue, Ui and Uimp on an ATS datasheet?<\/h3>\r\n      <p>\r\n        Ue is the rated operational voltage. Ui is the rated insulation voltage. Uimp is the rated impulse withstand voltage. They describe different characteristics and should not be used interchangeably. [2]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can I compare two ATS products only by their kA rating?<\/h3>\r\n      <p>\r\n        No. First identify what each short-circuit value represents, the applicable voltage and duration, and whether the rating depends on a specified upstream protective device. [2][4]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does every three-phase four-wire system require a 4P ATS?<\/h3>\r\n      <p>\r\n        No. The key issue is whether the neutral must be switched. Review the grounding and bonding arrangement and the approved project design before choosing the pole configuration. [3]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is ATS transfer time the same as generator restoration time?<\/h3>\r\n      <p>\r\n        Not necessarily. Generator restoration can also include failure detection, intentional delays, generator starting and source-acceptance logic. Read the exact definition of every timing value in the selected controller documentation. [2]\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Are the power-terminal schedule and control-terminal diagram the same thing?<\/h3>\r\n      <p>\r\n        No. Power-terminal data can define conductor size, bolt size, torque and main-circuit connections, while control documentation defines sensing, generator-start, status, alarm and auxiliary interfaces.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does IEC 60947-6-1 on a brochure prove that my exact ATS model is covered?<\/h3>\r\n      <p>\r\n        Do not assume so. Check the exact model or product range covered by the applicable declaration, certificate or report and compare that scope with the configuration being ordered.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>What should I send a supplier for accurate ATS model confirmation?<\/h3>\r\n      <p>\r\n        Send the single-line diagram, source arrangement, voltage, frequency, design current, poles, load information, upstream protective device, available fault-current information, transition requirement, control signals, required documents and relevant installation conditions.\r\n      <\/p>\r\n    <\/div>\r\n\r\n  <\/div>\r\n\r\n  <section class=\"ly-references\">\r\n    <h2><span class=\"ez-toc-section\" id=\"references\"><\/span>References<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n    <ol>\r\n      <li>\r\n        International Electrotechnical Commission (IEC).\r\n        <em>IEC 60947-6-1:2026 \u2014 Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment<\/em>.\r\n        Edition 4.0, published 2 April 2026.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener noreferrer\">IEC publication page<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        ABB.\r\n        <em>TruONE ATS \u2014 Automatic Transfer Switches, Technical Data according to IEC 60947-6-1<\/em>.\r\n        Manufacturer technical data includes Ue, Ui, Uimp, frequency, poles, utilization category, Iq, Icw, Icm, transfer-time data, mechanical endurance, conductor cross-section, terminal bolt size, tightening torque, dimensions and weight.\r\n        <a href=\"https:\/\/library.e.abb.com\/public\/0d67ffc914d94f58b7c9ce97a6bd486b\/Low_TruONE_ATS_1SCC303008C0201_Global_Catalog_19-12.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">ABB technical catalogue<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        Eaton.\r\n        <em>Low-voltage Contactor Type Transfer Switches Design Guide<\/em>.\r\n        Guidance includes switched-neutral application principles for three-phase and single-phase transfer systems.\r\n        <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/design-guides---consultant-audience\/eaton-ats-contactor-design-guide-dg140001en.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton design guide<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        Eaton.\r\n        <em>Selecting Protective Devices Handbook<\/em>.\r\n        Transfer-switch guidance explains the relationship between short-circuit withstand\/closing ratings, available fault current and protective devices.\r\n        <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/products\/electrical-circuit-protection\/fuses\/technical-literature\/bus-ele-br-3002-spd-2017.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton protective-device handbook<\/a>.\r\n      <\/li>\r\n\r\n      <li>\r\n        Eaton.\r\n        <em>Automatic Transfer Switch Fundamentals<\/em>.\r\n        Technical guidance covers source monitoring, open and closed transition, switched-neutral arrangements, transfer mechanisms and transfer-switch ratings.\r\n        <a href=\"https:\/\/www.eaton.com\/us\/en-us\/products\/low-voltage-power-distribution-control-systems\/automatic-transfer-switches\/automatic-transfer-switch-fundamentals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Eaton ATS fundamentals<\/a>.\r\n      <\/li>\r\n    <\/ol>\r\n\r\n    <div class=\"ly-final-note\">\r\n      This article is a B2B procurement and engineering-selection guide. Final ATS approval must use the actual project specification, single-line diagram, protection design, installation conditions, destination-market requirements and model-specific manufacturer documentation.\r\n    <\/div>\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>An ATS datasheet is not just a list of ratings. For a distributor, panel builder, generator-set integrator, electrical contractor or OEM buyer, it is a project-compatibility document. The correct way to read it is to compare the automatic transfer switch specifications with the single-line diagram, load, upstream protection, control requirements and project specification before the&#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-31758","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 v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Read an ATS Datasheet &amp; Specifications Before Ordering | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn how to read an ATS datasheet before ordering, including rated current, Ue, Ui, Uimp, poles, PC class, utilization category, short-circuit ratings, transfer time, terminals, control signals, IEC 60947-6-1 and project compatibility.\" \/>\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\/th\/how-to-read-ats-datasheet\/\" \/>\n<meta property=\"og:locale\" content=\"th_TH\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Read an ATS Datasheet &amp; 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