{"product_id":"castair-15-hp-208-230-volt-3-phase-magnetic-starter-s152-with-overload","title":"Castair 15 HP 208\/230 Volt. 3 Phase* Magnetic Starter S152 With Overload","description":"\u003cp\u003eThe \u003cstrong\u003eCastair S152\u003c\/strong\u003e is the OEM magnetic motor starter for \u003cstrong\u003e15 HP, 208\/230-Volt, three-phase Castair piston air compressors\u003c\/strong\u003e. The S152 is the three-phase 208\/230V entry point for 15 HP motor protection — a step up in contactor capacity from the 10 HP S102, with \u003cstrong\u003ethree B70 heater elements\u003c\/strong\u003e for three-phase overload protection at this current level. Castair specifies quality name-brand, off-the-shelf magnetic starters for all their compressors so technicians can source, replace, and service them without proprietary components or dealer callouts.\u003c\/p\u003e\n\n\u003ch2\u003eWhy 15 HP Demands a Properly Rated Starter\u003c\/h2\u003e\n\u003cp\u003eA 15 HP motor at 208\/230V three-phase draws approximately 40–42 amps full load. Starting inrush can be 6–7 times that — 240–290 amps for the brief starting interval. The S152's contactor is rated to close against that inrush without contact welding or damage. The overload relay with B70 heater elements monitors per-phase running current and trips if the motor overloads — from a stuck unloader, seized pump, low voltage condition, or phase loss. A properly sized and functional starter is what stands between a $500 motor repair and a $2,500 motor replacement when something goes wrong.\u003c\/p\u003e\n\n\u003ch2\u003eHeater Element Specification\u003c\/h2\u003e\n\u003cp\u003eThree \u003cstrong\u003eB70 heater elements\u003c\/strong\u003e required — one per phase. Note that the B70 is the same heater element used in the single-phase S101 (10 HP, 230V, 1-phase), but the S152 requires three of them for three-phase coverage. The B70 is sized for the per-phase current of a 15 HP three-phase motor at 208\/230V. Verify the motor's nameplate FLA against the overload relay chart if your motor's amperage differs from standard.\u003c\/p\u003e\n\n\u003ch2\u003eCastair Starter Lineup — 208\/230V Three-Phase Comparison\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eS52\u003c\/strong\u003e — 5 HP, 208\/230V, 3-phase, heater: B25 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS72\u003c\/strong\u003e — 7.5 HP, 208\/230V, 3-phase, heater: B36 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS102\u003c\/strong\u003e — 10 HP, 208\/230V, 3-phase, heater: B45 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS152 (this unit)\u003c\/strong\u003e — 15 HP, 208\/230V, 3-phase, heater: B70 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS202\u003c\/strong\u003e — 20 HP, 208\/230V, 3-phase, heater: CC87.7 (×3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eS252\u003c\/strong\u003e — 25 HP, 208\/230V, 3-phase, heater: CC132 (×3)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor 460V three-phase 15 HP applications, see the S154 with B32 heater elements. Verify your supply voltage before ordering — a 230V starter used on a 460V circuit will fail immediately and may cause a motor fault.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThree B70 heater elements required (sold separately or ask us to include them)\u003c\/li\u003e\n\u003cli\u003eVerify supply voltage is 208V or 230V three-phase before installation\u003c\/li\u003e\n\u003cli\u003ePressure switch connects to the magnetic coil circuit, not the load terminals\u003c\/li\u003e\n\u003cli\u003eMount in original enclosure; connect to same terminal designations as the failed starter\u003c\/li\u003e\n\u003cli\u003eTest overload reset after installation before returning compressor to service\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 S152\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Horsepower:\u003c\/strong\u003e 15 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 208\/230 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 B70 — 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 with the correct contactor rating and overload relay for 15 HP three-phase operation. Free shipping on qualifying orders. Free tech support at \u003cstrong\u003e866-217-0063\u003c\/strong\u003e. Full Castair manufacturer warranty. Ask us about including the three B70 heater elements with your starter 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":53342598627541,"sku":"S152","price":1086.3,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/MAGNETIC-MOTOR-STARTERS.jpg?v=1772652896","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-15-hp-208-230-volt-3-phase-magnetic-starter-s152-with-overload","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}