{"product_id":"the-grid-arbitrator-250a-transfer-switch","title":"The Grid Arbitrator | 250A 4-Pole Dual-Power Transfer Switch","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003ePower does not fail politely. It fails at the moment the load matters most, when a generator has to pick up a workshop floor, a cold room, or a pump house without a second of doubt. The Grid Arbitrator is built for that second. It watches both incoming sources, reads which one is alive, and commits the whole panel to the source worth trusting.\u003c\/p\u003e\n\u003cp\u003eThe SKT1 control board carries two ratings in one body, 250A and 300A, wired for AC 220V control and configured for single-phase or three-phase distribution. The four-pole layout switches three phases plus neutral together, which keeps motors, inverters, and control boards from seeing an open neutral while the changeover happens. Contact assemblies are sized for the inrush that comes with a diesel set starting under load, not just for steady-state nameplate current.\u003c\/p\u003e\n\u003cp\u003eInstallation stays inside familiar territory. The board mounts into standard distribution cabinets, accepts customized wiring configuration on request, and sits alongside the AISIKAI and SHALUO generator parts family that maintenance teams already keep on the shelf. Set the source priority once. After that, the switch works the night shift alone.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eSources change. The load never notices.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eeeeee;\"\u003e\n\u003cdiv class=\"product-features\"\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e Four-pole switching covers three phases plus neutral, so no phase drifts during a changeover.\u003c\/li\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e Two current ratings, 250A and 300A, covering the cabinet sizes most common in small industrial installations.\u003c\/li\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e AC 220V control circuit works with single-phase and three-phase distribution.\u003c\/li\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e Tuned for diesel generator changeover, including the starting inrush of motor loads.\u003c\/li\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e Control board format fits standard panel cutouts and existing ATS enclosures.\u003c\/li\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e Customized configuration available on both the SKT1-250\/4P and the SKT1-300\/4P.\u003c\/li\u003e\n\u003cli style=\"padding: 10px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003e✦\u003c\/strong\u003e Supplied as a serviceable board assembly, so a spare can be stocked without buying a whole switchgear unit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-specs\" style=\"margin-top: 30px;\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e AISIKAI \/ SHALUO\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e SKT1\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eModel Numbers:\u003c\/strong\u003e SKT1-250\/4P and SKT1-300\/4P\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eRated Current:\u003c\/strong\u003e 250A or 300A, depending on model\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 4P (three phases plus neutral)\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eControl Voltage:\u003c\/strong\u003e AC 220V\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003ePhase Compatibility:\u003c\/strong\u003e Single-phase and three-phase systems\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Dual power automatic transfer switch\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e Diesel generator changeover and mains standby\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eCustomization:\u003c\/strong\u003e Available (is_customized: yes)\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Control board, panel or distribution cabinet\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Power distribution switching equipment \/ generator parts\u003c\/li\u003e\n\u003cli style=\"padding: 9px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-applications\" style=\"margin-top: 30px;\"\u003e\n\u003ch3\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp\u003eStandby power panels for workshops, cold storage, water treatment rooms, telecom cabinets, and small production lines where the mains and the generator must never argue in public. Also a practical spare for maintenance teams servicing diesel generator sets, because the board drops into existing ATS enclosures rather than forcing a cabinet rebuild.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-faq\" style=\"margin-top: 30px;\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between the 250A and 300A models?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnly the rated current differs. Both use the same SKT1 control board platform, the same 4-pole layout, and the same AC 220V control circuit. Choose by the size of your service entrance and the locked-rotor current of the largest motor on the panel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will it switch a three-phase load?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The 4P layout switches three phases plus neutral as one action, which is what three-phase distribution needs. The same unit also serves single-phase installations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is it suitable for a diesel generator with an automatic start controller?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is built around generator changeover, with the control circuit running at AC 220V, so it pairs with common genset controllers and changeover panels.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What does the is_customized field mean here?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe factory accepts modified wiring and configuration for the SKT1 board. Tell us your phase count, current rating, and control arrangement before ordering and we will confirm what can be built.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What should I confirm before ordering?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThree things: phase configuration, required rated current (250A or 300A), and control voltage. Send those and we will match the model to your panel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How is the unit installed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is an electrically operated control board, mounted inside a distribution cabinet and wired to both sources and the load. A qualified electrician should commission the changeover and verify source priority on site.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 16px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does a four-pole switch cost more than a three-pole version?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt can, because the fourth pole carries the neutral and its contact set is sized to match. For three-phase loads that include drives, inverters, or electronic controls, switching the neutral is what protects the equipment during a transfer, so in most panels it is the safer specification.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-promise\" style=\"margin-top: 30px; padding: 18px 20px; background: #f8f8f6;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp\u003eEvery board is checked before dispatch and shipped with tracked international delivery. Order confirmations include a configuration review, so the rated current, phase layout, and control voltage are verified against your panel before the box leaves the warehouse. Spare parts for the AISIKAI and SHALUO generator family are available on request.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"product-gallery\" style=\"margin-top: 30px; text-align: center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se53a0011eb15489b901eb8ab0f23bf24R_0aa91e65-c280-4dee-a995-929932f13976.webp?v=1735260133\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; height: auto; margin-bottom: 12px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sfff128d2a1cb48b1a78c7dee5e13ddefU_307f5baa-205d-4c36-abc7-62c00555101f.webp?v=1735260134\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; height: auto; margin-bottom: 12px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sb7b71c368fef49c3a1620585fafe74b7c_7878cb22-b91c-47d1-a488-e7b2e15fadd5.webp?v=1735260133\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; height: auto; margin-bottom: 12px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sc2d96f8297d64ea78d8f1704f4e45a55U_2080624d-a3b6-41d8-980e-9d11fe1f0fa3.webp?v=1735260133\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; height: auto; margin-bottom: 12px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S9ac1e39c87534c0d99250c46c2ec2999F_8ff6961a-1b71-4319-b7bf-51467a567fea.webp?v=1735260133\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; height: auto; margin-bottom: 12px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S072f5cf6ed97411b9600f941453618b9w_3f4fca5c-8fb9-4183-959a-26bc694f1733.webp?v=1735260133\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; height: auto; margin-bottom: 12px; display: block;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Se53a0011eb15489b901eb8ab0f23bf24R_8710ff1a-a2fb-4a72-9ff9-4e991450a416.webp?v=1735260133\" alt=\"The Grid Arbitrator\" style=\"max-width: 100%; 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