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This is the factory OEM replacement contactor (part number HN53CB115) for the Carrier C4850C50ZG030200 packaged unit. The contactor is a high-voltage relay controlled by the 24V thermostat signal — when the thermostat calls for cooling, the contactor closes and connects line voltage to the compressor and condenser fan motor. A failed contactor is one of the most common causes of an air conditioning system that simply won't turn on, hums without starting, or shows visible pitting and burning on the contact points.
Compatibility: Designed specifically for the Carrier C4850C50ZG030200 packaged unit. Confirm your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence and get your system back online fast.