{"id":31646,"date":"2026-10-13T08:57:24","date_gmt":"2026-10-13T00:57:24","guid":{"rendered":"https:\/\/www.cnspd.com\/?p=31646"},"modified":"2026-10-13T08:58:54","modified_gmt":"2026-10-13T00:58:54","slug":"ats-for-diesel-generator-sets-selection-start-signal-sizing-guide","status":"publish","type":"post","link":"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/","title":{"rendered":"ATS f\u00fcr Dieselgeneratoren: Leitfaden zur Auswahl, zum Startsignal und zur Dimensionierung"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"31646\" class=\"elementor elementor-31646\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-704f2a0 e-flex e-con-boxed e-con e-parent\" data-id=\"704f2a0\" 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-d567931 elementor-widget elementor-widget-html\" data-id=\"d567931\" 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width:100%;\r\n  }\r\n}\r\n<\/style>\r\n\r\n<article class=\"leeyee-dgats\">\r\n\r\n  <span class=\"ly-kicker\">Diesel Generator ATS Selection Guide<\/span>\r\n\r\n  <p class=\"ly-intro\">\r\n    Choosing an ATS for a diesel generator is not simply a matter of matching generator kVA to an ampere rating. A reliable utility-to-generator system must coordinate the actual load current, voltage and frequency, phase and neutral arrangement, generator-controller start interface, source monitoring, transfer sequence and protection requirements. <sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-quick\">\r\n    <span class=\"ly-quick-title\">Quick Answer<\/span>\r\n    <p>\r\n      For a typical diesel generator backup system, the ATS monitors utility power. If the normal source remains unacceptable, the system requests the generator to start. The load transfers only after the generator source satisfies the controller's acceptance conditions. When utility power returns and remains acceptable, the ATS retransfers the load and the generator can complete its cool-down period before stopping. <sup><a href=\"#ref-1\">[1]<\/a><\/sup><sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n    <\/p>\r\n\r\n    <ul class=\"ly-keypoints\">\r\n      <li>Match ATS current to the actual load, not generator kVA alone.<\/li>\r\n      <li>Confirm voltage, frequency and phase arrangement.<\/li>\r\n      <li>Verify the generator controller's remote-start interface.<\/li>\r\n      <li>Choose 3P or 4P only after reviewing neutral and earthing design.<\/li>\r\n      <li>Confirm source-acceptance and timing requirements.<\/li>\r\n      <li>Check upstream protection and short-circuit coordination.<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div id=\"ez-toc-container\" class=\"ez-toc-v2_0_87 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#what-should-you-confirm-before-choosing-a-diesel-generator-ats\" >What Should You Confirm Before Choosing a Diesel Generator ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#how-does-an-ats-work-with-a-diesel-generator\" >How Does an ATS Work With a Diesel Generator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#how-does-the-ats-start-the-diesel-generator\" >How Does the ATS Start the Diesel Generator?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#when-is-the-generator-ready-for-load-transfer\" >When Is the Generator Ready for Load 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\/de\/diesel-generator-ats\/#should-you-use-a-2p-3p-or-4p-ats\" >Should You Use a 2P, 3P or 4P ATS?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#how-do-you-match-ats-current-to-generator-capacity\" >How Do You Match ATS Current to Generator Capacity?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#why-is-open-transition-suitable-for-standard-generator-backup\" >Why Is Open Transition Suitable for Standard Generator Backup?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#can-a-diesel-generator-ats-provide-zero-interruption-backup\" >Can a Diesel Generator ATS Provide Zero-Interruption Backup?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#what-information-should-you-send-before-ordering\" >What Information Should You Send Before Ordering?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#frequently-asked-questions\" >Frequently Asked Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"#\" data-href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/#references\" >References<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"what-should-you-confirm-before-choosing-a-diesel-generator-ats\"><\/span>What Should You Confirm Before Choosing a Diesel Generator ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    ATS selection should start with the electrical system and the load. Transfer equipment must suit the required load current and voltage, while short-circuit capability and upstream protection also need to match the installation conditions. <sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:26%;\">Selection Item<\/th>\r\n          <th style=\"width:35%;\">What to Confirm<\/th>\r\n          <th style=\"width:39%;\">Why It Matters<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"Selection Item\"><strong>System voltage<\/strong><\/td>\r\n          <td data-label=\"What to Confirm\">Utility and generator rated voltage<\/td>\r\n          <td data-label=\"Why It Matters\">The ATS power circuit and sensing functions must suit the system.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Selection Item\"><strong>Frequency<\/strong><\/td>\r\n          <td data-label=\"What to Confirm\">50 Hz, 60 Hz or project requirement<\/td>\r\n          <td data-label=\"Why It Matters\">Frequency can form part of source-acceptance logic.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Selection Item\"><strong>Phase and poles<\/strong><\/td>\r\n          <td data-label=\"What to Confirm\">Single-phase or three-phase; neutral arrangement<\/td>\r\n          <td data-label=\"Why It Matters\">This determines the required switching configuration.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Selection Item\"><strong>Load current<\/strong><\/td>\r\n          <td data-label=\"What to Confirm\">Actual design or continuous load current<\/td>\r\n          <td data-label=\"Why It Matters\">This is a primary input for ATS current selection.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Selection Item\"><strong>Generator controller<\/strong><\/td>\r\n          <td data-label=\"What to Confirm\">Brand, model and remote-start input<\/td>\r\n          <td data-label=\"Why It Matters\">The start command must match the genset controller interface.<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"Selection Item\"><strong>Neutral and earthing<\/strong><\/td>\r\n          <td data-label=\"What to Confirm\">Grounding arrangement and whether neutral must switch<\/td>\r\n          <td data-label=\"Why It Matters\">This affects 3P versus 4P selection and protection behaviour.<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-an-ats-work-with-a-diesel-generator\"><\/span>How Does an ATS Work With a Diesel Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A diesel generator ATS performs a controlled sequence rather than one instant switching action. The controller monitors the power sources, requests generator start when required, evaluates source availability, transfers the load and later returns the load to normal power.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/diesel-generator-ats-automatic-transfer-sequence.webp\"\r\n      alt=\"Diesel generator ATS automatic transfer sequence from utility failure to generator backup and utility recovery\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Typical utility-to-diesel-generator transfer sequence. Exact sensing thresholds and time delays must be confirmed for the selected controller and project.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <ol class=\"ly-flow\">\r\n    <li><strong>Utility supplies the load.<\/strong> The ATS monitors the preferred source.<\/li>\r\n    <li><strong>Utility becomes unacceptable.<\/strong> The controller detects the configured abnormal-source condition.<\/li>\r\n    <li><strong>The generator receives a start request.<\/strong> The generator controller manages the engine-start sequence.<\/li>\r\n    <li><strong>The generator builds electrical output.<\/strong> Engine running does not automatically mean the source is ready for transfer.<\/li>\r\n    <li><strong>The alternate source is accepted.<\/strong> The generator voltage and applicable frequency conditions must satisfy the controller logic.<\/li>\r\n    <li><strong>The load transfers.<\/strong> In open transition, the first source is disconnected before the second source is connected.<\/li>\r\n    <li><strong>Utility is monitored for recovery.<\/strong> The normal source must satisfy the configured return conditions.<\/li>\r\n    <li><strong>The load retransfers to utility.<\/strong> A retransfer delay may be used before returning the load.<\/li>\r\n    <li><strong>The generator completes its cool-down or stop delay.<\/strong> It can then receive the stop command. <sup><a href=\"#ref-2\">[2]<\/a><\/sup><\/li>\r\n  <\/ol>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-does-the-ats-start-the-diesel-generator\"><\/span>How Does the ATS Start the Diesel Generator?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    The ATS normally does not crank the engine directly. Its control system provides a start request to the genset controller, while the generator controller manages cranking, engine protection and generator output build-up. <sup><a href=\"#ref-2\">[2]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/ats-dry-contact-diesel-generator-start-wiring.webp\"\r\n      alt=\"ATS dry contact remote start connection to a diesel generator controller with separate power and control wiring\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      Generator power wiring and generator-start control wiring are separate functions. Verify the specific genset controller's remote-start input before wiring.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <h3>Is the generator start signal always a dry contact?<\/h3>\r\n\r\n  <p>\r\n    A volt-free or dry-contact two-wire start arrangement is common in generator integration, but it must not be treated as a universal terminal standard. Generator controllers can differ in terminal assignment, NO\/NC logic, input type and permitted electrical characteristics.\r\n  <\/p>\r\n\r\n  <div class=\"ly-warning\">\r\n    <strong>Do not wire by assumption.<\/strong>\r\n    Always verify the exact generator-controller manual and approved project wiring diagram before commissioning.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"when-is-the-generator-ready-for-load-transfer\"><\/span>When Is the Generator Ready for Load Transfer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A diesel engine can already be running while its electrical output is still building or stabilising. The alternate source should satisfy the controller's acceptance conditions before the ATS transfers the load. <sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <div class=\"ly-callout\">\r\n    <strong>Engineering meaning:<\/strong>\r\n    \u201cGenerator running\u201d and \u201cgenerator accepted for transfer\u201d are different conditions. Voltage thresholds, frequency logic and delays must be confirmed from the selected controller and project specification.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"should-you-use-a-2p-3p-or-4p-ats\"><\/span>Should You Use a 2P, 3P or 4P ATS?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Pole selection starts with the phase arrangement, but phase count alone does not determine whether the neutral should switch. A three-phase diesel generator does not automatically require a 4P ATS.\r\n  <\/p>\r\n\r\n  <figure class=\"ly-figure\">\r\n    <img loading=\"lazy\"\r\n      src=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/2p-3p-4p-ats-diesel-generator-selection.webp\"\r\n      alt=\"Comparison of 2P 3P and 4P ATS configurations for single-phase and three-phase diesel generator systems\"\r\n      width=\"1448\"\r\n      height=\"1086\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n    <figcaption>\r\n      ATS pole configuration must follow the actual phase, neutral, grounding and protection design rather than phase count alone.\r\n    <\/figcaption>\r\n  <\/figure>\r\n\r\n  <div class=\"ly-table-wrap\">\r\n    <table>\r\n      <thead>\r\n        <tr>\r\n          <th style=\"width:20%;\">ATS<\/th>\r\n          <th style=\"width:36%;\">Typical Arrangement<\/th>\r\n          <th style=\"width:44%;\">Project Question<\/th>\r\n        <\/tr>\r\n      <\/thead>\r\n      <tbody>\r\n        <tr>\r\n          <td data-label=\"ATS\"><strong>2P<\/strong><\/td>\r\n          <td data-label=\"Typical Arrangement\">Single-phase application with two switched conductors<\/td>\r\n          <td data-label=\"Project Question\">Which conductors must switch in the actual design?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"ATS\"><strong>3P<\/strong><\/td>\r\n          <td data-label=\"Typical Arrangement\">L1, L2 and L3 switched; neutral remains solid<\/td>\r\n          <td data-label=\"Project Question\">Is a solid neutral suitable for the grounding and protection arrangement?<\/td>\r\n        <\/tr>\r\n        <tr>\r\n          <td data-label=\"ATS\"><strong>4P<\/strong><\/td>\r\n          <td data-label=\"Typical Arrangement\">L1, L2, L3 and neutral switched<\/td>\r\n          <td data-label=\"Project Question\">Does the system require neutral switching?<\/td>\r\n        <\/tr>\r\n      <\/tbody>\r\n    <\/table>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"how-do-you-match-ats-current-to-generator-capacity\"><\/span>How Do You Match ATS Current to Generator Capacity?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Generator ratings are commonly expressed in kVA, while an ATS is selected with a current rating and other electrical characteristics. Generator kVA can provide a reference full-load current, but it should not be the only selection criterion.\r\n  <\/p>\r\n\r\n  <div class=\"ly-equation\">\r\n    Three-phase current \u2248 (kVA \u00d7 1000) \u00f7 (\u221a3 \u00d7 line-to-line voltage)\r\n  <\/div>\r\n\r\n  <div class=\"ly-example\">\r\n    <p><strong>Example: 100 kVA, 400 V, three phase<\/strong><\/p>\r\n    <p>100,000 \u00f7 (1.732 \u00d7 400) \u2248 <strong>144 A<\/strong>.<\/p>\r\n    <p>\r\n      This is a reference generator full-load current. Final ATS selection still requires review of the actual load, voltage, load characteristics, protection and short-circuit conditions.\r\n    <\/p>\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"why-is-open-transition-suitable-for-standard-generator-backup\"><\/span>Why Is Open Transition Suitable for Standard Generator Backup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    Open transition is a <strong>break-before-make<\/strong> transfer. The first source is disconnected before the second source is connected, so the utility and generator are not intentionally paralleled during a standard transfer. <sup><a href=\"#ref-1\">[1]<\/a><\/sup>\r\n  <\/p>\r\n\r\n  <p>\r\n    This matches the standard product application discussed on this page: a compact automatic transfer switch used between normal utility power and a backup generator source.\r\n  <\/p>\r\n\r\n  <div class=\"ly-product-evidence\">\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 for utility and diesel generator backup applications\"\r\n      loading=\"lazy\"\r\n      decoding=\"async\">\r\n\r\n    <h3>LEEYEE Compact ATS for Generator Backup Applications<\/h3>\r\n\r\n    <p>\r\n      The product image shows LEEYEE compact ATS models in 2P and 4P configurations, including Auto\/Manual operation and utility\/generator source identification. This form factor is intended for compact low-voltage backup-power switching rather than a large bypass-isolation ATS cabinet.\r\n    <\/p>\r\n\r\n    <p>\r\n      The pictured units provide real product evidence for the type of compact utility-to-generator ATS discussed in this guide. Final voltage, current rating, pole configuration and generator-controller interface still need to be confirmed for the specific project.\r\n    <\/p>\r\n\r\n    <div class=\"ly-product-tags\">\r\n      <span>Compact ATS<\/span>\r\n      <span>2P \/ 4P shown<\/span>\r\n      <span>Auto \/ Manual<\/span>\r\n      <span>Utility \/ Generator<\/span>\r\n      <span>Open-transition application<\/span>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-scope\">\r\n    <strong>Product-scope boundary:<\/strong>\r\n    this page is focused on LEEYEE compact open-transition ATS applications. Closed transition, intentional source paralleling and large bypass-isolation systems should be treated as separate engineering requirements rather than assumed functions of this compact product family.\r\n  <\/div>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"can-a-diesel-generator-ats-provide-zero-interruption-backup\"><\/span>Can a Diesel Generator ATS Provide Zero-Interruption Backup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <p>\r\n    A standard open-transition ATS does not provide zero-interruption power. Break-before-make transfer creates an interruption, and after a utility failure the diesel generator also requires time to start and reach an acceptable electrical condition.\r\n  <\/p>\r\n\r\n  <p>\r\n    If a load cannot tolerate this interruption, the project may require a UPS or another ride-through solution in addition to the generator and ATS.\r\n  <\/p>\r\n\r\n  <h2><span class=\"ez-toc-section\" id=\"what-information-should-you-send-before-ordering\"><\/span>What Information Should You Send Before Ordering?<span class=\"ez-toc-section-end\"><\/span><\/h2>\r\n\r\n  <div class=\"ly-checklist\">\r\n    <span class=\"ly-checklist-title\">Diesel Generator ATS Project Checklist<\/span>\r\n    <ul>\r\n      <li>Utility rated voltage<\/li>\r\n      <li>Generator rated voltage<\/li>\r\n      <li>50 Hz or 60 Hz<\/li>\r\n      <li>Single-phase or three-phase<\/li>\r\n      <li>Actual load current<\/li>\r\n      <li>Generator rated kVA<\/li>\r\n      <li>Required pole configuration<\/li>\r\n      <li>Neutral and earthing arrangement<\/li>\r\n      <li>Generator controller brand and model<\/li>\r\n      <li>Remote-start input information<\/li>\r\n      <li>Upstream breaker or fuse information<\/li>\r\n      <li>Available fault current where known<\/li>\r\n      <li>Applicable standard requirement<\/li>\r\n      <li>Quantity and OEM requirements<\/li>\r\n    <\/ul>\r\n  <\/div>\r\n\r\n  <div class=\"ly-cta\">\r\n    <h3>Need to Confirm a Diesel Generator ATS Configuration?<\/h3>\r\n    <p>\r\n      Send your generator controller model, system voltage and frequency, phase arrangement, load current and neutral requirement. LEEYEE can review the compact ATS configuration before quotation.\r\n    <\/p>\r\n\r\n    <button type=\"button\"\r\n            class=\"leeyee-about-btn-light leeyee-site-popup-btn\"\r\n            aria-label=\"Request a Quote\">\r\n      <span class=\"w-btn-label\">Request a Quote<\/span>\r\n    <\/button>\r\n  <\/div>\r\n\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    <div class=\"ly-faq-item\">\r\n      <h3>Does an ATS automatically start a diesel generator?<\/h3>\r\n      <p>\r\n        In a typical utility-to-generator system, the transfer-control system can send a start request after the normal source becomes unacceptable. The generator controller then manages engine starting. The exact interface must be confirmed for the selected genset controller.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Does the ATS transfer as soon as the engine starts?<\/h3>\r\n      <p>\r\n        Not necessarily. The generator can be running before its output satisfies the controller's source-acceptance conditions.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can I use a 3P ATS with a three-phase diesel generator?<\/h3>\r\n      <p>\r\n        It can be appropriate where the neutral remains solid, but this decision must be based on the grounding, neutral and protection design rather than phase count alone.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>When should a 4P ATS be considered?<\/h3>\r\n      <p>\r\n        A 4P ATS switches the neutral together with the three phase conductors. Whether this is required depends on the project grounding and neutral arrangement.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Is a dry contact enough to start every generator?<\/h3>\r\n      <p>\r\n        No universal assumption should be made. Remote-start terminals and electrical logic vary between generator controllers, so the exact controller documentation must be checked.\r\n      <\/p>\r\n    <\/div>\r\n\r\n    <div class=\"ly-faq-item\">\r\n      <h3>Can a standard ATS keep sensitive loads powered without interruption?<\/h3>\r\n      <p>\r\n        No. A standard compact open-transition ATS uses break-before-make transfer. Loads that require ride-through may also need a UPS or another suitable backup architecture.\r\n      <\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <div class=\"ly-related\">\r\n    <p>\r\n      <strong>Related technical reading:<\/strong>\r\n      for broader ATS operating principles and general selection logic, see the\r\n      <a href=\"https:\/\/www.cnspd.com\/what-is-an-automatic-transfer-switch-how-ats-works-how-to-choose\/\">\r\n        LEEYEE Automatic Transfer Switch Guide\r\n      <\/a>.\r\n    <\/p>\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    <ol>\r\n      <li id=\"ref-1\">\r\n        Eaton \u2014 <em>Fundamentals of Automatic Transfer Switches (ATS)<\/em>. Technical guidance covering source monitoring, generator applications, open transition and neutral-switching concepts.\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\">Official source<\/a>\r\n      <\/li>\r\n\r\n      <li id=\"ref-2\">\r\n        Cummins Power Generation \u2014 <em>T-011: Transfer Switch Application Manual<\/em>, A048F226. Application guidance covering utility-to-generator operation, start signalling, transfer\/retransfer logic, current rating and short-circuit application considerations.\r\n        <a href=\"https:\/\/www.cummins.com\/sites\/default\/files\/2024-08\/t011-Transfer-switch-application-manual.pdf\" target=\"_blank\" rel=\"noopener\">Official PDF<\/a>\r\n      <\/li>\r\n\r\n      <li id=\"ref-3\">\r\n        Eaton \u2014 <em>3-Pole and 4-Pole Transfer Switch Switching Characteristics<\/em>. Technical guidance covering switched neutral, solid neutral, grounding and ground-fault considerations.\r\n        <a href=\"https:\/\/www.eaton.com\/content\/dam\/eaton\/markets\/healthcare\/knowledge-center\/white-paper\/3-pole-and-4-pole-transfer-switch-switching-characteristics.pdf\" target=\"_blank\" rel=\"noopener\">Official PDF<\/a>\r\n      <\/li>\r\n\r\n      <li id=\"ref-4\">\r\n        International Electrotechnical Commission \u2014 <em>IEC 60947-6-1:2026, Low-voltage switchgear and controlgear \u2014 Part 6-1: Multiple function equipment \u2014 Transfer switching equipment<\/em>, Edition 4.0.\r\n        <a href=\"https:\/\/webstore.iec.ch\/en\/publication\/90494\" target=\"_blank\" rel=\"noopener\">IEC official source<\/a>\r\n      <\/li>\r\n    <\/ol>\r\n  <\/section>\r\n\r\n<\/article>\r\n\r\n<script>\r\ndocument.addEventListener('DOMContentLoaded', function () {\r\n  var aboutPopupButtons = document.querySelectorAll('.leeyee-site-popup-btn');\r\n\r\n  aboutPopupButtons.forEach(function (button) {\r\n    button.addEventListener('click', function () {\r\n      var realPopupTrigger = document.querySelector(\r\n        '.w-popup.ush_popup_1 .w-popup-trigger'\r\n      );\r\n\r\n      if (realPopupTrigger) {\r\n        realPopupTrigger.click();\r\n      } else {\r\n        window.open(\r\n          'https:\/\/www.cnspd.com\/contact\/',\r\n          '_blank',\r\n          'noopener'\r\n        );\r\n      }\r\n    });\r\n  });\r\n});\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Diesel Generator ATS Selection GuideChoosing an ATS for a diesel generator is not simply a matter of matching generator kVA to an ampere rating. A reliable utility-to-generator system must coordinate the actual load current, voltage and frequency, phase and neutral arrangement, generator-controller start interface, source monitoring, transfer sequence and protection requirements. [1][2] Quick Answer For&#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-31646","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>Diesel Generator ATS: Selection &amp; Integration Guide | LEEYEE<\/title>\n<meta name=\"description\" content=\"Learn how to select an ATS for a diesel generator, including generator start signal, transfer sequence, 2P\/3P\/4P selection, current sizing, neutral switching and project information required before ordering.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Diesel Generator ATS: Selection &amp; Integration Guide | LEEYEE\" \/>\n<meta property=\"og:description\" content=\"Learn how to select an ATS for a diesel generator, including generator start signal, transfer sequence, 2P\/3P\/4P selection, current sizing, neutral switching and project information required before ordering.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.cnspd.com\/de\/diesel-generator-ats\/\" \/>\n<meta property=\"og:site_name\" content=\"Surge Protector, Surge Arrestor, Isolating Switch - LEEYEE\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-13T00:57:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-13T00:58:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.cnspd.com\/wp-content\/uploads\/2026\/09\/diesel-generator-ats-automatic-transfer-sequence.webp\" \/>\n<meta name=\"author\" content=\"Devin Ling\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Devin Ling\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"8\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/diesel-generator-ats\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/diesel-generator-ats\\\/\"},\"author\":{\"name\":\"Devin Ling\",\"@id\":\"https:\\\/\\\/www.cnspd.com\\\/#\\\/schema\\\/person\\\/f49dbafe62c5b47100ad2d9f88af92d3\"},\"headline\":\"ATS for Diesel Generator Sets: Selection, Start Signal &#038; 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