OEM Carrier Contactor 24V 2-Pole for Model PH3GNAA36000AA (HN51KC024)

This is the factory OEM replacement contactor for the Carrier PH3GNAA36000AA packaged HVAC unit. The contactor is a high-voltage relay controlled by a low-voltage (24V) signal from the thermostat. When the thermostat calls for cooling, the control board energizes the contactor coil, closing the contacts and sending line voltage to the compressor and condenser fan motor. A failed contactor is one of the most common causes of a system that won't turn on — symptoms include a loud chattering or humming from the contactor, the compressor failing to start, or a complete loss of cooling despite the thermostat calling for it.

• Specs: OEM Part Number HN51KC024 | 2-Pole design | 24V coil voltage | Factory-rated contact ampacity | Direct drop-in replacement
• OEM vs Generic: This OEM contactor is manufactured to Carrier's exact electrical specifications. Generic contactors often use lower-grade contact materials that arc and pit faster, leading to premature failure — especially under the high-cycling demands of a packaged unit.
• Install Difficulty: 3/5 — Line voltage is present in the unit's contactor compartment. Always disconnect power at the breaker AND the disconnect block before servicing. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, multimeter. Label all high-voltage wires before removal.
• Warranty: Backed by a 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PH3GNAA36000AA packaged unit. Always verify coil voltage and pole configuration on your unit's data plate before ordering. Our parts specialists are available to confirm fitment — reach out before you buy if you have any questions.