OEM Carrier Single-Pole Contactor 1-Pole 30A 24V Coil for Model PH12NA042000AAAA (HN51KC024)

This is the genuine OEM factory-authorized replacement contactor for the Carrier PH12NA042000AAAA heat pump and split-system condenser. The contactor is the primary high-voltage switching relay in your outdoor unit — when the thermostat sends a 24V signal, the contactor closes to deliver line voltage to the compressor and condenser fan motor. A failing contactor causes some of the most common and frustrating HVAC symptoms: the unit won't turn on, runs continuously without shutting off, chatters or buzzes loudly from the electrical panel, or trips the breaker due to burned and pitted contacts welding together.

• Specs: 1-Pole configuration | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | 24 VAC coil voltage | 50/60 Hz | OEM Part# HN51KC024
• OEM vs Generic: This is a Factory Authorized Part built to exact Carrier specifications, ensuring proper coil pull-in voltage, contact gap, and arc suppression. Generic aftermarket contactors often use thinner contact material that pits faster under high compressor inrush loads, shortening service life significantly.
• Install difficulty: 2/5 — Shut off power at both the disconnect and the breaker before opening the control panel. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph existing wiring before disconnecting terminals. Verify 24V coil pull-in after installation with a call from the thermostat.
• Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Directly fits Carrier model PH12NA042000AAAA heat pump condensers. Cross-references include P282-0311, HN51CC024, and 3100-15Q228. Always confirm the part number on your unit's wiring diagram or data plate before ordering. Have a question about fitment? Our HVAC parts specialists verify compatibility before you buy — reach out before placing your order.