OEM Carrier Contactor 24V Coil 2-Pole for Model PH12NA042000ACAA

This is the factory OEM replacement contactor (part number HN51KC024) for the Carrier PH12NA042000ACAA heat pump system. The contactor is the high-voltage relay that the thermostat's 24V control signal energizes to send line voltage to the compressor and condenser fan motor. When the contactor fails — whether from pitted contacts, a burned coil, or welded terminals — your system will either refuse to start entirely, run continuously without shutting off, or fail to deliver cooling and heating on demand.

• Specs: 24V AC coil voltage | 2-pole configuration | Factory OEM replacement for Carrier HN51KC024 | Rated for R-410A system electrical loads
• OEM vs Generic: This is a genuine OEM Carrier contactor built to exact factory specifications. OEM contacts resist pitting longer than generic equivalents and the coil is wound to precise 24V tolerances — critical for reliable thermostat-to-contactor signal response.
• Install Difficulty: 3/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before removal. Line-voltage terminals require careful torquing — loose connections cause arcing and premature failure.
• Warranty: 1-year OEM factory warranty against defects. Orders placed by our daily cutoff ship the same business day from our stocked warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PH12NA042000ACAA heat pump. Confirm your existing contactor's coil voltage (24V) and pole count (2-pole) against your unit's wiring diagram and data plate before ordering. Our fitment team is available to verify compatibility before you purchase — don't hesitate to reach out.