OEM Carrier 1-Pole Contactor 24V 30A for Model PH4RNG042000BAAA (HN51KC024)

This is the genuine OEM factory-specified contactor for the Carrier PH4RNG042000BAAA heat pump system. The contactor is a high-voltage switching relay controlled by the 24V thermostat circuit — when the thermostat calls for cooling or heating, it energizes the contactor coil, pulling the contacts down to deliver line voltage to the compressor. When the contactor fails, symptoms range from the unit refusing to start (open coil or pitted contacts) to running continuously and unable to shut off (welded/stuck contacts). You may also hear audible chattering or humming from the contactor itself.

• Specs: 1-Pole | 24 VAC Coil Voltage | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | 50/60 Hz | OEM Part # HN51KC024
• OEM vs Generic: This OEM unit is factory-matched to Carrier specifications for exact dimensional fit, coil pull-in voltage, and contact gap. Generic contactors often use lower-grade contact materials prone to premature pitting and arcing, shortening compressor life and risking nuisance lockouts.
• Install Difficulty: 2/5 — Disconnect and lock out all power before opening the unit. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph existing wiring before disconnecting. Verify coil pull-in with a 24V call after installation. Line and load terminals must be correctly torqued per the wiring diagram.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Factory-specified replacement for Carrier model PH4RNG042000BAAA. Cross-references include P282-0311, HN51CC024, 301362-101, and P282-1304. Verify your unit's data plate and parts list confirm HN51KC024 before ordering. Have a compatibility question? Our HVAC parts specialists verify fitment before you buy — contact us today.