OEM Carrier Single-Pole Contactor 24V 25A (HN51KB024) for Model PH1ZNA024000ABAA

This is the factory OEM replacement contactor for the Carrier PH1ZNA024000ABAA heat pump / condensing unit. The contactor is the high-voltage relay that bridges the 24V thermostat control circuit to the 240V compressor and condenser fan motor circuits. When the thermostat calls for cooling or heating, the 24V coil energizes, closing the contacts and powering the compressor. A failed contactor is one of the most common reasons an outdoor unit simply will not turn on — you may hear a hum or click at the unit with no compressor start, or the system may run intermittently due to pitted or welded contact surfaces.

• Specs: 1-Pole (single-pole) | 24V AC 50/60Hz coil | 25 FLA (Full Load Amps) | 35 RES | OEM part number HN51KB024 | Factory Authorized Part
• OEM vs Generic: This is a genuine Carrier OEM contactor manufactured to exact factory tolerance. Generic aftermarket contactors may have inconsistent contact gap, lighter coil wire gauge, and reduced arc suppression — all of which shorten service life, especially in high-cycle residential applications.
• Install difficulty: 2/5 — Shut off power at the disconnect box and wait for capacitors to discharge before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before removal. Coil leads (low voltage) and line/load terminals (high voltage) must be reconnected correctly — refer to the unit wiring diagram inside the panel door.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH1ZNA024000ABAA. Also fits select Bryant, Payne, and Day & Night models that specify part number HN51KB024. Always verify the part number on your existing contactor's label or your unit's parts list before ordering. Our team is happy to confirm fitment — reach out before you buy.