OEM Carrier Contactor 24V Coil 2-Pole for Model PH12NA024000ACAA

This OEM contactor is the factory-specified replacement part (HN51KB024) for the Carrier PH12NA024000ACAA heat pump system. The contactor is a high-voltage relay controlled by the 24V thermostat signal — when your thermostat calls for cooling or heating, the contactor closes to send 240V power to the compressor and condenser fan motor. When it fails, the most common symptom is an AC or heat pump that simply won't turn on despite the thermostat calling for operation. You may also notice pitting or burning on the contact points upon inspection, or hear a buzzing/chattering from the contactor coil.

• Specs: OEM Part # HN51KB024 | 2-Pole configuration | 24V control coil voltage | Factory-matched contact amperage rating for Carrier PH12NA024000ACAA
• OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to exact factory specifications. OEM contacts resist pitting and arcing far longer than generic alternatives, which often use lower-grade contact alloys that degrade quickly under compressor load cycling.
• Install Difficulty: 3/5 — This repair involves live 240V high-voltage wiring. Always shut off power at the disconnect and breaker before beginning. Photograph all wiring before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, and insulated work gloves. If uncomfortable with high-voltage work, consult a licensed HVAC technician.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM drop-in replacement for Carrier model PH12NA024000ACAA heat pump systems. Always verify your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running fast.