OEM Carrier 1-Pole Contactor 25A 24V Coil (HN51KB024) for Model PH10JA03000GADAA

This is the factory OEM replacement contactor for the Carrier PH10JA03000GADAA packaged HVAC unit. The contactor is the high-voltage relay that closes the circuit to power your compressor and/or condenser fan motor every time the thermostat calls for cooling or heating. When the contactor fails, the most common symptom is a system that simply won't turn on — you may hear the thermostat click and the indoor air handler respond, but the outdoor unit stays silent. In other cases, a worn or pitted contactor causes intermittent operation, chattering, or a system that runs continuously because the contacts have welded shut.

• Specs: 1-Pole | 25A Full Load Amps (FLA) | 24V AC Coil (50/60Hz) | Definite Purpose Contactor | Factory OEM part number HN51KB024
• OEM vs Generic: This OEM contactor is manufactured to exact Carrier tolerances for contact gap, coil pull-in voltage, and silver-alloy contact material. Aftermarket contactors often use lower-grade contact alloys that pit and erode faster, especially under repeated daily cycling common in packaged units.
• Install Difficulty: 2/5 — Disconnect all power at the breaker and verify zero voltage with a multimeter before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, and a multimeter. Always photograph existing wiring before disconnecting any terminals to ensure correct reinstallation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH10JA03000GADAA packaged HVAC units. Verify your unit's data plate shows the HN51KB024 part number or a 1-Pole 25A 24V coil contactor specification before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.