OEM Carrier Single-Pole Contactor 30 Amp 24V (HN51KC024) for Model PH12NA048000AAAA

This is the factory OEM replacement contactor for the Carrier PH12NA048000AAAA heat pump unit, sold under Carrier part number HN51KC024. The contactor is the high-voltage relay in your outdoor unit that receives a 24V signal from the thermostat and closes to send line voltage to the compressor and/or condenser fan motor. When a contactor fails — whether from pitted contacts, a burned coil, or welded-shut poles — the most common symptoms are a unit that won't energize on a call for cooling, intermittent compressor dropouts, or a contactor that stays energized and won't shut off.

• Specs: 1-Pole | 24 VAC coil voltage | 30 Amps FLA | 150 Amps LRA | 50/60 Hz | Factory OEM tolerance and geometry
• OEM vs Generic: OEM contactors carry exact coil impedance, contact silver alloy thickness, and terminal geometry specified by Carrier. Generic contactors often use thinner contact surfaces and wider coil tolerances, increasing arc erosion and shortening service life — especially critical on high-cycling residential systems.
• Install difficulty: 2/5 — Shut off all power at the disconnect box and verify zero voltage before touching any terminals. Photograph all wiring before disconnecting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, non-contact voltage tester. Note: low-voltage coil leads may be oriented differently from the original — verify against your unit wiring diagram.
• Warranty & Shipping: 1-year OEM factory warranty. In-stock units ship same business day from our warehouse.

Compatibility: Engineered for Carrier model PH12NA048000AAAA. Also used across a wide range of Carrier, Bryant, and Payne residential and light-commercial HVAC equipment listing HN51KC024 in the official parts bill. Always confirm the part number against your unit's data plate or parts list before ordering. Need fitment help? Our HVAC parts specialists verify compatibility before you buy — call or chat today.