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This OEM replacement contactor is the factory-specified part for the Carrier C50A405022 packaged unit. The contactor is the high-voltage relay that receives a 24V signal from the thermostat and closes its contacts to send line voltage to the compressor and condenser fan motor. When a contactor fails — through pitted contacts, a burned coil, or contacts that weld shut — your system will either refuse to start entirely, run continuously without shutting off, or trip the breaker repeatedly. Replacing a worn contactor is one of the most cost-effective repairs in residential and light-commercial HVAC service.
Compatibility: Designed specifically for the Carrier C50A405022 packaged unit. This part supersedes OEM numbers HN53CD115 and HN53HF122 — both are fulfilled by this single replacement contactor. Confirm your unit's data plate voltage and amperage specs match before ordering. Our HVAC parts specialists are available to verify fitment — reach out before you buy for complete peace of mind.