OEM Carrier 1-Pole Contactor 25A 24V Coil for Model PH12NA02400GADAA (HN51KB024)

This OEM Carrier contactor is the factory-specified replacement part for the Carrier PH12NA02400GADAA heat pump / condensing unit. The contactor is a high-voltage relay controlled by the 24V thermostat circuit — when your thermostat calls for cooling or heating, the contactor closes its contacts to energize the compressor and/or condenser fan motor. A failed contactor is one of the most common causes of a system that won't turn on at all, runs continuously without shutting off, or produces a loud buzzing/chattering noise from the electrical cabinet. Replacing it restores full high-voltage switching control to the unit.

• Specs: 1-Pole | 25A Full Load Amps (FLA) | 24V 50/60Hz Coil | Definite Purpose Contactor | OEM Part # HN51KB024
• OEM vs Generic: Genuine OEM contactors feature precision-machined silver-alloy contact tips and factory-rated coil windings that meet exact Carrier specifications. Generic aftermarket units often use subgrade contact materials prone to pitting, welding, and premature coil burnout — costing far more in callbacks than the price difference.
• Install Difficulty: 2/5 — Shut off all power at the disconnect AND breaker before beginning. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring terminals before disconnecting. Transfer line, load, and 24V coil leads one at a time to the new contactor to avoid miswiring.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered as the direct factory replacement for Carrier model PH12NA02400GADAA. Also cross-references Carrier/Bryant/Payne family units calling for a 1-pole, 24V, 25A definite purpose contactor. Always verify amperage and coil voltage on your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you order if you're unsure.