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This is the OEM factory-specified contactor (part number HN53CB115) for the Carrier C4850C50AW02021 packaged unit. The contactor is the high-voltage relay that receives a 24V signal from the thermostat or control board and closes the circuit to send line voltage to the compressor and condenser fan motor. When the contactor fails — due to pitted or welded contacts, a burned coil, or worn contact surfaces — the system will either fail to start entirely, run continuously without shutting off, or trip the breaker repeatedly. Replacing the contactor is one of the most common and cost-effective HVAC repairs available.
Compatibility: Designed for the Carrier C4850C50AW02021 packaged unit. Always verify the OEM part number HN53CB115 on your existing contactor's label and confirm coil voltage and pole configuration match your unit's wiring diagram before ordering. Need fitment help? Our HVAC parts specialists are available to verify compatibility before you buy — same-day shipping on all in-stock orders.