OEM Carrier Contactor 24V Coil 2-Pole for Model PH10JA030000AGAA

This OEM contactor (part number HN51KB024) is the factory-specified replacement for the Carrier PH10JA030000AGAA packaged heat pump unit. The contactor is a high-voltage relay controlled by the 24V thermostat signal — when your thermostat calls for cooling or heating, the contactor closes to send line voltage to the compressor and condenser fan motor. When a contactor fails, symptoms include an AC or heat pump that simply won't energize, a system that runs continuously without shutting off, or visible pitting and burning on the contact surfaces causing intermittent operation.

• Specs: OEM Part No. HN51KB024 | 2-Pole design | 24V coil voltage | Factory-matched contact rating for Carrier PH10JA030000AGAA — verify amperage on your unit's data plate before ordering
• OEM vs Generic: OEM contactors use silver-alloy contact tips rated for thousands of switching cycles. Generic alternatives often use lower-grade contacts that pit and arc faster, leading to premature failure and potential compressor damage from voltage drop.
• Install difficulty: 3/5 — Always shut off power at both the disconnect box and breaker panel before servicing. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring connections before removing the old contactor. Line-voltage terminals remain energized at the line side even when the unit is off — confirm power is fully disconnected.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders ship same business day from our warehouse when placed before cutoff.

Compatibility: Designed as a direct OEM replacement for Carrier model PH10JA030000AGAA packaged heat pump systems. Always cross-reference the part number on the existing contactor label and verify coil voltage and pole configuration match before installation. Our fitment specialists are available to confirm compatibility before you order — reach out via chat or phone.