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This OEM contactor is the factory-specified high-voltage relay for the Carrier C4850C48ZT105610 packaged unit. The contactor acts as the primary switching device that closes the high-voltage circuit to the compressor and condenser fan motor when the thermostat sends a 24V signal. When the contactor fails — due to pitted contacts, a burned coil, or a stuck plunger — the system will appear to receive a call for cooling but the compressor and fan will not energize. You may hear a clicking or buzzing sound at the unit with no mechanical response.
Compatibility: Engineered as a direct OEM replacement for Carrier model C4850C48ZT105610 packaged units. Cross-references OEM part numbers HN53CB115, HN53HF122, and HN53HG120. Verify coil voltage and pole configuration on your existing unit's data plate or wiring diagram before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions.