OEM Carrier Contactor 24V Coil 2-Pole for Model PH12NA01800GACAA

This OEM contactor (part number HN51KB024) is the factory-specified replacement for the Carrier PH12NA01800GACAA system. The contactor is a high-voltage switching relay controlled by the 24V signal from your thermostat or control board. When energized, it closes the high-voltage circuit that powers the compressor and condenser fan motor. A failed contactor is one of the most common causes of a system that simply won't turn on — symptoms include the outdoor unit not responding to a cooling call, audible buzzing or chattering at the contactor, or burned/pitted contact points visible on inspection.

• Specs: 2-pole design | 24V AC coil voltage | Factory-rated amperage | Direct OEM drop-in replacement for HN51KB024
• OEM vs Generic: This is a genuine OEM Carrier contactor built to exact factory contact-gap and coil-pull-in specifications. Generic contactors may use lower-grade contact materials that pit faster under load cycling, shortening service life significantly.
• Install difficulty: 2/5 — Always disconnect power at the breaker and verify zero voltage with a multimeter before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before removing the old contactor.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our stocked warehouse when ordered before the daily cutoff.

Compatibility: Engineered for Carrier model PH12NA01800GACAA. Always cross-reference the part number on your existing contactor's label and verify coil voltage and pole configuration against your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by to verify compatibility before you buy.