OEM Carrier Single-Pole Contactor 1-Pole 30A 24V Coil — HN51KC024 for Model PH12NA04800GADAA

This is the genuine OEM Carrier contactor (part number HN51KC024), the factory-specified high-voltage relay for the Carrier PH12NA04800GADAA packaged heat pump unit. The contactor acts as the main switching relay in the outdoor unit's control circuit, receiving a 24V signal from the thermostat and closing the high-voltage circuit to energize the compressor and/or condenser fan motor. When the contactor fails — due to pitted contacts, a burned or open coil, or contacts welded shut — the system will either refuse to turn on entirely or run continuously without responding to thermostat calls.

• Specs: 1-Pole configuration | 24 VAC coil voltage | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | 50/60 Hz rated | Factory OEM part number HN51KC024
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, engineered to meet exact Carrier Corporation specifications for pull-in voltage, contact material, and contact gap. Generic aftermarket contactors may meet the basic electrical spec but often use lower-grade contact alloys that pit and weld faster under compressor cycling loads.
• Install difficulty: 2/5 — Always disconnect power at the disconnect box before opening the control compartment. Photograph all wiring before removing any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V coil signal and confirm contact continuity). Follow the unit wiring diagram for line, load, and coil lead connections, then verify contactor pull-in with a live 24V thermostat call before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-specified replacement contactor for Carrier model PH12NA04800GADAA packaged heat pump. Also cross-references to Bryant, Payne, and other ICP-family units that list HN51KC024 on the official parts list. Always verify your unit's data plate and parts list before ordering — if you need help confirming fitment, our HVAC parts specialists are standing by.