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This is the factory-specified OEM replacement contactor for the Carrier C50A503061 packaged unit. The contactor is a high-voltage relay that receives a 24V signal from the thermostat and closes the circuit to deliver line voltage to the compressor and condenser fan motor. When the contactor fails — due to pitted contacts, a stuck plunger, or a burned coil — your system will appear completely unresponsive, hum continuously, or fail to cool despite the thermostat calling for it. Replacing a worn contactor is one of the most common and cost-effective HVAC repairs available.
Compatibility: Engineered for the Carrier C50A503061 commercial packaged unit. Cross-reference your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Both OEM part numbers HN53CB115 and HN53CD115 are stocked and ready to ship. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — reach out before ordering.