OEM Carrier 1-Pole 30 Amp 24V Contactor (HN51KC024) for Model PH15NB03700GBBAA

This is the factory OEM replacement contactor for the Carrier PH15NB03700GBBAA heat pump / condensing unit. The contactor is the high-voltage relay that closes the compressor and condenser fan motor circuit every time the thermostat calls for cooling or heating. When it fails, you'll typically see one of these symptoms: the outdoor unit won't energize at all, contacts are pitted or burned through, or — in severe cases — the contacts weld shut causing the compressor to run continuously even with no thermostat call.

• Specs: 1-Pole | 24 VAC coil voltage | 30A FLA (Full Load Amps) | 150A LRA (Locked Rotor Amps) | 50/60 Hz | OEM Part# HN51KC024
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part engineered to meet exact factory specifications for your PH15NB03700GBBAA. Generic contactors often use lighter-gauge contact material that pits faster under compressor cycling loads, leading to premature failure and potential compressor damage.
• Install difficulty: 2/5 — Shut off power at both the disconnect box and breaker panel before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removing the old contactor. Verify 24V coil pull-in after installation with a thermostat call.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-specified contactor for Carrier model PH15NB03700GBBAA. This part is also a widely used single-pole contactor compatible with many Carrier, Bryant, and Payne systems that call out HN51KC024 in their official parts list — always confirm against your unit's wiring diagram and data plate before ordering. Our fitment team is standing by to verify compatibility before you buy.