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This OEM replacement contactor is the factory-specified high-voltage relay for the Carrier C4850C48AY05151 packaged unit. The contactor acts as the primary electrical switch between your thermostat's 24V control signal and the high-voltage power supply to the compressor and condenser fan motor. When the contactor fails — due to pitted contacts, a burned coil, or a stuck plunger — the system will either refuse to start entirely, run continuously without shutting off, or trip the circuit breaker repeatedly. OEM part numbers covered by this listing include HN53CB115, HN53HF122, and HN53HG120.
Compatibility: Designed and tested for the Carrier C4850C48AY05151 packaged unit. Cross-references OEM part numbers HN53CB115, HN53HF122, and HN53HG120 — confirm your existing part number against this list before ordering. If you need fitment verification, our HVAC parts specialists are available to confirm compatibility before you buy.