OEM Carrier Contactor HN51KC024 for Model PH4ANG030000BDAA

This OEM contactor (part number HN51KC024) is the factory-specified high-voltage switching relay for the Carrier PH4ANG030000BDAA heat pump system. The contactor acts as the primary electromechanical switch that allows the 24V thermostat signal to energize the high-voltage compressor and condenser fan circuits. When the contactor fails, symptoms include: the outdoor unit failing to start on a call for cooling or heating, the system running continuously and refusing to shut off, or visible pitting and burning on the contactor contacts from repeated electrical arcing.

• Specs: OEM Part No. HN51KC024 | 2-Pole configuration | 24V AC coil voltage | Factory-matched contact ratings for Carrier PH4ANG030000BDAA heat pump
• OEM vs Generic: This is the exact factory OEM part. OEM contactors use heavy-duty silver-alloy contacts rated for the precise load cycles of your unit. Generic aftermarket contactors often use lower-grade contact materials that pit and fail prematurely under high-amperage compressor loads.
• Install difficulty: 3/5 — Always disconnect power at the disconnect box and confirm zero voltage with a multimeter before beginning work. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, and a multimeter. Photograph all wiring connections before removal to ensure correct reinstallation.
• Warranty: 1-year OEM factory warranty. In-stock units ship same business day when ordered before cut-off.

Compatibility: Engineered as a direct OEM replacement for Carrier PH4ANG030000BDAA heat pump systems. Always verify the part number on your existing contactor's label and confirm coil voltage and pole configuration match your unit's wiring diagram before ordering. Our fitment team is available to verify compatibility before you buy — reach out before placing your order.