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This OEM Carrier contactor (part #HN52KC052) is the factory-specified high-voltage relay for the Carrier 09DE044900 HVAC unit. The contactor acts as the primary electrical switch that energizes the compressor and condenser fan motor every time your thermostat calls for cooling or heating. When the 24V control signal arrives, the contactor's 120V coil pulls in the armature, closing the high-voltage circuit to your load. When a contactor fails, symptoms include an air conditioner that won't turn on at all, a system that hums without starting, welded contacts that keep the compressor running constantly, or visible pitting and burn marks on the contact surfaces.
Compatibility: Engineered as a direct OEM replacement for Carrier model 09DE044900. Verify pole count, amperage, and coil voltage against your unit's data plate and existing contactor label before ordering. Our parts specialists are available to confirm fitment — contact us before you buy if you have any questions.