{"product_id":"castair-10-hp-460-volt-3-phase-magnetic-starter-s104-with-overload","title":"Castair 10 HP 460 Volt. 3 Phase Magnetic Starter S104 With Overload","description":"\u003cp\u003eThe \u003cstrong\u003eCastair S104\u003c\/strong\u003e is the OEM magnetic motor starter for \u003cstrong\u003e10 HP, 460-Volt, three-phase Castair piston air compressors\u003c\/strong\u003e. The S104 is the 460V equivalent of the S102 (208\/230V, 3-phase, 10 HP) — same horsepower and phase, higher voltage. At 460V, the motor draws approximately half the current of the 208\/230V equivalent for the same power output. That means smaller wire gauge in the motor circuit, smaller contactor contacts, and smaller overload heater elements — in this case, \u003cstrong\u003ethree B25 heater elements\u003c\/strong\u003e versus the B45 elements used in the S102.\u003c\/p\u003e\n\n\u003ch2\u003e460V Operation — Why It Matters for Larger Shop Installations\u003c\/h2\u003e\n\u003cp\u003e460V three-phase is the standard industrial voltage for larger shops, manufacturing facilities, and any installation where long wire runs between the panel and the compressor would cause significant voltage drop at 230V. If your facility has 460V three-phase available and your compressor is rated for it, there are clear advantages:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHalf the current draw at the same HP — smaller wire, smaller breaker, less heat in the circuit\u003c\/li\u003e\n\u003cli\u003eBetter voltage stability over long runs — less voltage drop means the motor gets closer to its rated voltage\u003c\/li\u003e\n\u003cli\u003eLower contact wear on the starter contactor — lower current means less arcing at each start\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe S104 is the correct starter for 460V-rated Castair compressors. Do not use a 230V starter on a 460V circuit — the contactor and overload elements are not interchangeable.\u003c\/p\u003e\n\n\u003ch2\u003eHeater Element Specification\u003c\/h2\u003e\n\u003cp\u003eThree \u003cstrong\u003eB25 heater elements\u003c\/strong\u003e required — one per phase. The B25 is sized for the lower per-phase current drawn by a 10 HP motor at 460V versus 230V. The overload relay trips if any phase draws current above the heater's rated threshold, protecting against phase loss, overload, and locked rotor conditions.\u003c\/p\u003e\n\n\u003ch2\u003eCastair Starter Lineup — 460V Three-Phase Models\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS54\u003c\/strong\u003e — 5 HP, 460V, 3-phase, heater: B11.5 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS74\u003c\/strong\u003e — 7.5 HP, 460V, 3-phase, heater: B22 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS104 (this unit)\u003c\/strong\u003e — 10 HP, 460V, 3-phase, heater: B25 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS154\u003c\/strong\u003e — 15 HP, 460V, 3-phase, heater: B32 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS204\u003c\/strong\u003e — 20 HP, 460V, 3-phase, heater: B40 (×3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e S104\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Horsepower:\u003c\/strong\u003e 10 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 460 Volt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-Phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverload:\u003c\/strong\u003e Included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired Heater Elements:\u003c\/strong\u003e B25 — qty 3 (one per phase)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Cast Air\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From OEM Diagnostic Tools?\u003c\/h3\u003e\n\u003cp\u003eOEM Castair magnetic starters — correct 460V contactor rating and B25 overload heater specification. Free shipping on qualifying orders. Free tech support at \u003cstrong\u003e866-217-0063\u003c\/strong\u003e. Full Castair manufacturer warranty. Call us if you need the B25 heater elements included with your order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342598529237,"sku":"S104","price":529.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/MAGNETIC-MOTOR-STARTERS_a29ec7ea-b940-4931-8d6a-87bc18253f30.jpg?v=1772652895","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-10-hp-460-volt-3-phase-magnetic-starter-s104-with-overload","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}