OEM Carrier Single-Pole Contactor 24V Coil 25A FLA — HN51KB024 for Model PH12NA024000ABAA

The Carrier HN51KB024 is the factory OEM single-pole contactor for the PH12NA024000ABAA heat pump system. The contactor acts as a high-voltage relay, responding to the 24V signal from your thermostat to energize the compressor and condenser fan motor. When it fails — due to worn contacts, pitting, or a burned coil — the system will either refuse to start entirely, fail to cool or heat, or run continuously without cycling off. Catching a failing contactor early prevents expensive compressor damage.

• Specs: 1 Pole (Single Pole) | 24V 50/60Hz Coil | 25A FLA (Full Load Amps) | 30A Resistive | Factory OEM part number HN51KB024 — exact fit for PH12NA024000ABAA
• OEM vs Generic: OEM Carrier contactors use factory-spec contact materials and coil windings, ensuring precise pull-in voltage and long service life. Generic aftermarket contactors can suffer from early contact erosion and coil burnout, risking repeat failures within one season.
• Install Difficulty: 2/5 — Shut off all power at both the breaker and the disconnect before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removing any wires. The contactor mounts in the electrical compartment of the outdoor unit — accessible with the service panel removed.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse — order by 3PM for same-day dispatch.

Compatibility: Direct OEM replacement for Carrier model PH12NA024000ABAA. Always confirm your unit's data plate matches the 1-pole, 24V coil specification before ordering. Not sure it fits? Our HVAC parts specialists are available to verify fitment before you buy — no returns needed.