OEM Carrier 2-Pole Contactor 40A 24V Coil (HN52TC040) for Model TCHC0250HEFMRAF521

This is the factory OEM replacement contactor for the Carrier TCHC0250HEFMRAF521 heat pump and cooling system. The contactor is the high-voltage relay that closes the circuit to energize the compressor and condenser fan motor every time your thermostat calls for cooling or heating. When it fails — due to pitted contacts, a burned coil, or a stuck plunger — the system either won't start at all, hums without running, or fails to shut off. Replacing it with the genuine OEM part (HN52TC040) restores factory-spec switching performance and protects the compressor from damaging voltage irregularities.

• Specs: 2-Pole | 40A FLA (Full Load Amps) | 24V 50/60Hz coil | Definite purpose contactor | OEM part number HN52TC040
• OEM vs Generic: This is a genuine Carrier OEM contactor, manufactured to exact factory tolerances for contact gap, coil pull-in voltage, and current rating. Generic contactors often carry loose amp tolerances that accelerate contact pitting and reduce compressor lifespan.
• Install difficulty: 2/5 — Always disconnect power at the breaker and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before removal. Tag and transfer one wire at a time to avoid miswiring.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Directly fits Carrier model TCHC0250HEFMRAF521. Verify your existing contactor's pole count (2-pole), amperage (40A FLA), and coil voltage (24V) against your unit's wiring diagram before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back up fast.