OEM Carrier 1-Pole 25 Amp Contactor 24V Coil (HN51KB024) for Model PH10JA01800GADAA

This is the factory OEM contactor for the Carrier PH10JA01800GADAA heat pump / condensing system. The contactor is a high-voltage relay that acts as the primary electrical switch for your outdoor unit. When the thermostat calls for cooling or heating, the control board sends a 24V signal to the contactor coil, which closes the high-voltage circuit and energizes the compressor and condenser fan motor. A failed contactor is one of the most common reasons an outdoor unit will not start — symptoms include the system humming without starting, the unit not responding to the thermostat at all, or contact points that have welded together and keep the unit running continuously even after the thermostat is satisfied.

• Specs: 1-Pole | 25 Amp load rating | 24V coil voltage | OEM Part Number HN51KB024 | Direct factory-spec replacement
• OEM vs Generic: OEM contactors from Carrier feature factory-specified contact materials and coil windings, ensuring precise pull-in voltage and long service life. Generic contactors may use inferior contact alloys that pit and weld prematurely under normal cycling loads.
• Install difficulty: 2/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before touching any terminals. Photograph all wire connections before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Replace like-for-like on all terminal positions.
• Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Factory-specified OEM replacement contactor for Carrier model PH10JA01800GADAA. Verify pole count, amp rating, and coil voltage against your unit's wiring diagram and data plate before ordering. Our fitment team is available to confirm compatibility prior to purchase — reach out before you order.