OEM Carrier Contactor 2-Pole 24V Coil for Model PH4GNAA30000AA

This is the factory OEM replacement contactor (part number HN51KC024) for the Carrier PH4GNAA30000AA packaged heating and cooling unit. The contactor is a high-voltage relay that acts as the primary switching device in your system's control circuit — when the thermostat calls for cooling, the 24V control signal energizes the coil, closing the high-voltage contacts to power the compressor and condenser fan motor. A failed contactor is one of the most common causes of an AC system that simply won't turn on, hums without starting, or experiences intermittent operation. Burned, pitted, or stuck contacts are tell-tale signs this part needs replacement.

• Specs: 2-Pole configuration | 24V AC coil voltage | Heavy-duty contact rating | Direct OEM factory replacement for part number HN51KC024
• OEM vs Generic: This OEM contactor is manufactured to Carrier's exact coil pull-in voltage and contact resistance specifications. Generic alternatives frequently use thinner contact material that pits and burns faster, shortening service life significantly — especially in high-cycle environments.
• Install Difficulty: 2/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal to ensure correct re-termination.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed by 3 PM EST ship same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PH4GNAA30000AA packaged unit. Always verify your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before finalizing your order. Our HVAC parts specialists are available to confirm fitment — just reach out before you order.