OEM Carrier Contactor HN51KB024 for Model PH1PNB030000AAAA

This OEM contactor (part number HN51KB024) is the factory-specified high-voltage relay for the Carrier PH1PNB030000AAAA heat pump system. The contactor acts as the primary power-switching relay, receiving a 24V signal from the thermostat control circuit and closing to send high-voltage power to the compressor and condenser fan motor. When the contactor fails — due to pitted or burned contacts, a stuck plunger, or a failed coil — the outdoor unit will not energize at all, or may run continuously without cycling off.

• Specs: 24V AC coil voltage | 2-pole configuration | Rated for single-phase compressor and fan motor loads | Factory-matched contact material and coil resistance for Carrier heat pump systems
• OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to exact factory specifications. Generic contactors often use inferior contact alloys that pit faster under high-inrush compressor loads, leading to premature failure and potential compressor damage.
• Install Difficulty: 2/5 — Always disconnect power at the breaker and verify voltage is absent with a multimeter before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Directly fits Carrier model PH1PNB030000AAAA heat pump systems. Always verify the coil voltage and pole configuration on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists are standing by to verify compatibility before you buy — order with confidence and get same-day shipping.