OEM Carrier 1-Pole Contactor 24V 25A — HN51KB024 for Model PH10JA01800GAFAA

This OEM single-pole contactor is the factory-specified replacement for the Carrier PH10JA01800GAFAA condenser unit. The contactor acts as a high-voltage relay, using a low-voltage (24V) signal from the thermostat to close the high-voltage circuit that powers the compressor and condenser fan motor. When the contactor fails — whether from pitted contacts, a burned coil, or a stuck plunger — the system will not respond to a cooling call, leaving you with warm air despite a functioning thermostat and control board.

• Specs: 1-Pole | 24V 50/60Hz Coil | 25A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | Definite Purpose design for HVAC condensing units
• OEM vs Generic: This is a genuine Carrier OEM part (HN51KB024), manufactured to exact factory contact gap, coil pull-in voltage, and contact plating specs. Generic aftermarket contactors often use thinner silver-alloy contacts that pit and burn faster under repeated cycling, shortening equipment lifespan.
• Install difficulty: 2/5 — Always shut off power at the disconnect box and verify zero voltage with a multimeter before servicing. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, and a multimeter to verify coil continuity. The contactor is located inside the condenser's electrical panel, typically secured by two screws.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH10JA01800GAFAA. Cross-references include successor part HN51KC024. Always verify pole count, coil voltage, and amperage rating on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us anytime.