OEM Carrier 1-Pole Contactor 24V 30A (HN51KC024) for Model PH12NA042000AGAA

This is the factory OEM replacement contactor for the Carrier PH12NA042000AGAA heat pump / air conditioning system. The contactor is the high-voltage relay that responds to a 24V thermostat signal to connect line voltage to the compressor and condenser fan motor. When it fails, the most common symptoms are an outdoor unit that won't turn on, an audible chattering or humming from the control compartment, contacts that are visibly burned or pitted, or — in the case of welded contacts — a unit that runs continuously and cannot be shut off by the thermostat.

• Specs: 1-Pole | 24 VAC coil voltage | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | 50/60 Hz | OEM part number HN51KC024
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part engineered to meet exact factory specifications for the PH12NA042000AGAA. Generic contactors often use lower-grade contact materials that pit and weld faster under compressor inrush loads, shortening service life significantly.
• Install difficulty: 2/5 — Shut off power at both the disconnect and breaker before opening the control compartment. Photograph all wiring before removing any terminals. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers. Verify 24V coil pull-in after installation before closing the panel.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH12NA042000AGAA. Also cross-references to P282-0311 and replaces HN51CC024, HN51KB024 in applicable configurations. Always verify the part number on your unit's wiring diagram or data plate before ordering. Our fitment team is available to confirm compatibility before you buy.