{"product_id":"the-continuity-250a-automatic-transfer-switch","title":"The Continuity | 250A 4P Automatic Transfer Switch for Dual Power","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003e\u003cstrong\u003eA building without a transfer switch has a single point of failure. A building with one has a plan.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEvery power-dependent facility eventually faces the same afternoon: the utility drops, the generator starts, and someone has to walk to a panel and move a handle. That walk takes minutes. In those minutes a cold room warms, a server rack falls over, a pump stops mid-cycle, and a business loses money it will never recover. The Aisikai automatic transfer switch exists to remove the walk. It watches both sources continuously, senses when the primary supply fails, and moves the load to the backup within the same breath, without a person in the room and without a manual handle to remember.\u003c\/p\u003e\n\u003cp\u003eThe engineering that matters here is contact quality. A 250A or 300A switch carries the full current of a building through four poles, and a weak contact is a hot spot waiting for a summer afternoon. These units use silver-alloy contacts in a mechanically interlocked assembly, so the two sources can never be closed at the same time, which is the failure mode that destroys generators and injures electricians. The enclosure is rated for real environments, and the control logic is set from the panel rather than a laptop, which means the person commissioning it does not need a software license to finish the job.\u003c\/p\u003e\n\u003cp\u003eIt works with the generator you already own, the utility feed you already have, and the panel you already installed. Single-phase or three-phase, 220V class systems, DIN-rail style mounting inside the cabinet. What it adds is not a feature. It is the difference between an outage that empties the freezer and an outage that nobody notices until the log is read.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eThe lights do not blink. That is the entire point.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-features\" style=\"margin-top:26px;\"\u003e\n\u003ch3 style=\"margin-bottom:12px;\"\u003eBuilt For Buildings That Cannot Stop\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ 250A and 300A ratings\u003c\/strong\u003e — Carries full building load on four poles, sized for commercial and light industrial panels.\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ Mechanical interlock\u003c\/strong\u003e — The two sources cannot close together, protecting the generator and the technician working downstream.\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ Automatic sensing and transfer\u003c\/strong\u003e — Detects loss of the primary feed and moves the load without an operator present.\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ Silver-alloy contacts\u003c\/strong\u003e — Low resistance under continuous current, which is where cheap switches fail hot.\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ Adjustable control logic\u003c\/strong\u003e — Set transfer delay, return delay, and operating mode from the front panel.\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ Single and three-phase use\u003c\/strong\u003e — Suits 220V class residential, commercial, and light industrial supplies.\u003c\/li\u003e\n\u003cli style=\"padding:10px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003e✦ Panel-mount enclosure\u003c\/strong\u003e — Fits standard cabinet layouts without a custom cutout project.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-specs\" style=\"margin-top:26px;\"\u003e\n\u003ch3 style=\"margin-bottom:12px;\"\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e 4P automatic transfer switch (ATS)\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eCurrent ratings:\u003c\/strong\u003e 250A and 300A models\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e Four-pole switching, three phases plus neutral\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eVoltage class:\u003c\/strong\u003e AC 220V single phase and three phase systems\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eContacts:\u003c\/strong\u003e Silver-alloy, mechanically interlocked\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eOperation:\u003c\/strong\u003e Automatic sensing with manual override\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eControl settings:\u003c\/strong\u003e Transfer delay, return delay, mode selection\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Panel or cabinet installation\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Utility to generator, or dual-source redundancy\u003c\/li\u003e\n\u003cli style=\"padding:9px 0;border-bottom:1px solid #eee;\"\u003e\n\u003cstrong\u003eEnclosure:\u003c\/strong\u003e Industrial housing for indoor panel installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-applications\" style=\"margin-top:26px;\"\u003e\n\u003ch3 style=\"margin-bottom:12px;\"\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 10px;\"\u003eFood businesses use it so a cold room never warms during a grid event. Telecom and server rooms use it to keep equipment alive across the switch. Farms use it on pumps and milking systems where an outage translates directly into loss. Workshops, clinics, and small factories install it alongside a standby generator so that the generator is useful the moment it is needed rather than after someone drives to the site. Anywhere a backup source exists on paper but depends on a human to activate it, this switch is what turns that plan into an automatic one.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-faq\" style=\"margin-top:26px;\"\u003e\n\u003ch3 style=\"margin-bottom:12px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: Can the two power sources ever connect at the same time?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eNo. The poles are mechanically interlocked, so the switch cannot close both sources simultaneously. This protects the generator and anyone working on the circuit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: Which rating do I need, 250A or 300A?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eMatch the switch to your service size with margin to spare. If your main breaker is 250A, choose the 300A unit so the switch is never the limiting component.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: Does it work with a generator I already own?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eYes. The switch is source-agnostic. It senses the utility feed and moves the load to whatever backup source is wired to the second input.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: How is the transfer delay configured?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eFrom the front panel. Transfer delay prevents nuisance switching during brief dips, and return delay avoids cycling when the utility is unstable after an event.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: Is it suitable for three-phase equipment?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eYes. The four-pole configuration switches three phases plus neutral, which is the standard arrangement for three-phase panels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: Can I operate it manually in an emergency?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eYes. There is a manual override so the load can be moved by hand if the control circuit is unavailable.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: How much space does it need in the cabinet?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003ePlan for the switch body plus clearance for the incoming cables and the panel door to close safely. Most installations fit a standard distribution cabinet.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom:16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eQ: Does it come with wiring instructions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eThe unit ships with the terminal layout and control settings documented. Final installation should be performed by a qualified electrician.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-promise\" style=\"margin-top:30px;padding:18px 20px;background:#fafafa;border-left:3px solid #191d20;\"\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eThe EastSupplier Promise\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003eEvery unit in this listing is inspected against the specification sheet published above before it leaves the warehouse. Variants are stocked in the quantities shown, priced in USD, and shipped from a facility that has handled cross-border orders for sixteen years.\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eIf the item you receive does not match what this page describes, we replace it. That has been the standard since 2010, and it is the reason buyers in over forty countries keep the order history they do.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top:34px;text-align:center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se53a0011eb15489b901eb8ab0f23bf24R_a0198ec2-0ecd-4e11-876a-996cac733590.webp?v=1735002240\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sfff128d2a1cb48b1a78c7dee5e13ddefU_921bc51f-6d8b-4c1d-9b08-dc86fed957a7.webp?v=1735002240\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sb7b71c368fef49c3a1620585fafe74b7c_f606b60c-269a-44fe-b907-97adcc1340d7.webp?v=1735002240\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sc2d96f8297d64ea78d8f1704f4e45a55U_45dc5326-8542-4cb5-911a-caec482176e6.webp?v=1735002240\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S9ac1e39c87534c0d99250c46c2ec2999F_533587d1-2f89-4f45-adb5-46ae4847c727.webp?v=1735002241\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S072f5cf6ed97411b9600f941453618b9w_24de50d4-6e5e-4fd0-bd42-61d988dd9f97.webp?v=1735002240\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se53a0011eb15489b901eb8ab0f23bf24R_26d923a9-f1cc-4b2a-aadb-765f12048af1.webp?v=1735002240\" alt=\"Aisikai 4P automatic transfer switch\" style=\"max-width:100%;height:auto;margin:0 auto 14px;display:block;border-radius:4px;\"\u003e\n\u003c\/div\u003e\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"Product\",\"name\":\"The Continuity | 250A 4P Automatic Transfer Switch for Dual Power\",\"description\":\"Four-pole 250A\/300A automatic transfer switch with mechanical interlock for utility-to-generator and dual-source power systems.\",\"sku\":\"AISIKAI-4P-ATS\",\"url\":\"https:\/\/eastsupplier.com\/products\/the-continuity-250a-automatic-transfer-switch\",\"brand\":{\"@type\":\"Brand\",\"name\":\"EastSupplier\"},\"offers\":{\"@type\":\"AggregateOffer\",\"priceCurrency\":\"USD\",\"lowPrice\":\"318.40\",\"highPrice\":\"339.20\",\"offerCount\":\"4\",\"availability\":\"https:\/\/schema.org\/InStock\",\"url\":\"https:\/\/eastsupplier.com\/products\/the-continuity-250a-automatic-transfer-switch\"},\"aggregateRating\":{\"@type\":\"AggregateRating\",\"ratingValue\":\"4.8\",\"reviewCount\":\"17\"}}\n\u003c\/script\u003e","brand":"East Supplier Platform","offers":[{"title":"250 4P \/ CHINA","offer_id":46620179267807,"sku":"32646591832-250 4P-CHINA","price":391.62,"currency_code":"USD","in_stock":true},{"title":"250 4P \/ Poland","offer_id":46620179300575,"sku":"32646591832-250 4P-Poland","price":369.34,"currency_code":"USD","in_stock":true},{"title":"250 4P \/ spain","offer_id":46620179398879,"sku":"32646591832-250 4P-spain","price":369.34,"currency_code":"USD","in_stock":true},{"title":"300 4P \/ CHINA","offer_id":46620179431647,"sku":"32646591832-300 4P-CHINA","price":393.47,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se53a0011eb15489b901eb8ab0f23bf24R_a0198ec2-0ecd-4e11-876a-996cac733590.webp?v=1735002240","url":"https:\/\/eastsupplier.com\/fr-es\/products\/the-continuity-250a-automatic-transfer-switch","provider":"EastSupplier Platform","version":"1.0","type":"link"}