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This is the factory OEM replacement contactor (part number HN51KC024) for the Payne PA12NA048000AGAA 4-ton split-system air conditioner. The contactor is a high-voltage relay controlled by your thermostat's 24V signal. When the thermostat calls for cooling, the contactor closes its contacts to send 240V power to the compressor and condenser fan motor. A failed contactor is one of the most common reasons an AC unit won't start — symptoms include the outdoor unit not responding at all, audible chattering or buzzing at the contactor, pitted or fused contacts, or the system tripping the breaker repeatedly.
Compatibility: Designed for the Payne PA12NA048000AGAA 4-ton split-system condenser. Always verify OEM part number HN51KC024 on your existing contactor or unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you have any questions. In stock and ready to ship today.