OEM Carrier Contactor 24V Coil 2-Pole for Model PH3PNA024000AA

This OEM contactor (part number HN51KB024) is the factory-specified high-voltage relay for the Carrier PH3PNA024000AA packaged heat pump unit. The contactor acts as the main electrical switch between your 24V thermostat control circuit and the high-voltage compressor and condenser fan motor circuits. When the thermostat calls for cooling or heating, the 24V coil energizes and closes the contacts, sending line voltage to the compressor. A failed contactor is one of the most common causes of an air conditioning system that simply won't turn on — even when the thermostat is calling for cooling.

• Specs: OEM Part No. HN51KB024 | 2-Pole design | 24V control coil | Factory-matched contact rating for Carrier packaged equipment
• OEM vs Generic: This is a genuine OEM Carrier contactor, manufactured to exact factory specifications. Generic contactors can exhibit coil burnout, contact pitting, and premature failure due to loose tolerances — risking compressor damage on an expensive packaged unit.
• Install difficulty: 3/5 — Always disconnect power at the disconnect box AND the breaker panel before proceeding. Tools needed: flathead and Phillips screwdrivers, 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3PM local time.

Compatibility: Designed as a direct OEM replacement for the Carrier PH3PNA024000AA packaged heat pump. Verify your existing contactor's pole count, coil voltage, and amperage rating from the unit data plate before ordering. Our HVAC parts specialists are available to confirm fitment — contact us before you buy.