OEM Carrier Contactor 24V Coil 2-Pole for Model PH12NA030000AAAA

This is the factory OEM contactor (part number HN51KB024) for the Carrier PH12NA030000AAAA heat pump system. The contactor is a high-voltage relay controlled by the 24V signal from your thermostat. When the thermostat calls for cooling or heating, the contactor closes its high-voltage contacts to energize the compressor and condenser fan motor. A failed contactor is one of the most common reasons an outdoor unit won't turn on — symptoms include a humming outdoor unit with no compressor start, pitted or burned contacts visible on inspection, or the unit failing to respond to a thermostat call at all.

• Specs: 24V AC coil voltage | 2-pole design | Replaces OEM part number HN51KB024 | Factory-matched contact rating for Carrier PH12NA030000AAAA
• OEM vs Generic: This OEM contactor is manufactured to Carrier's exact coil voltage and contact ampacity specifications. Generic contactors often use lower-grade contact materials that pit and weld faster under load cycling, leading to premature failure and potential compressor damage.
• Install Difficulty: 3/5 — Always disconnect power at the disconnect box AND the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, insulated gloves. Photograph all wiring before removal. The high-voltage line side (L1/L2) and load side (T1/T2) must be reconnected correctly.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PH12NA030000AAAA heat pump systems. Always verify coil voltage and pole configuration on your unit's data plate before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you order — reach out before you buy.