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This OEM replacement contactor is the factory-specified part for the Carrier C4850C48ZG050500 packaged unit. The contactor is a high-voltage relay controlled by the 24V thermostat signal — when your thermostat calls for cooling, the contactor closes to send line voltage to the compressor and condenser fan motor. A failed contactor is one of the most common reasons an AC system won't respond at all, produces a loud chattering or buzzing from the outdoor unit, or runs continuously without cycling off. OEM part numbers covered: HN53CB115, HN53HF122, HN53HG120.
Compatibility: Designed for the Carrier C4850C48ZG050500 packaged unit. Cross-references OEM part numbers HN53CB115, HN53HF122, and HN53HG120. Verify coil voltage and pole configuration on your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — same-day shipping means you're back up and running fast.