OEM Carrier 1-Pole Contactor 30A 24V Coil (HN51KC024) for Model PH4ANG042000BBAA

This OEM Carrier contactor (part# HN51KC024) is the factory-specified replacement for the Carrier PH4ANG042000BBAA heat pump condenser unit. The contactor is the high-voltage relay that opens and closes the compressor and condenser fan circuit every time your thermostat calls for cooling or heating. When contacts become pitted, burned, or welded shut — or when the 24V coil fails to pull in — the unit will either refuse to start or run continuously with no thermostat control. This is one of the most common service calls in residential HVAC.

• Specs: 1-Pole | 30A FLA / 150A LRA | 24 VAC Coil | 50/60 Hz | OEM Part# HN51KC024
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part, engineered to exact factory specifications for the PH4ANG042000BBAA. Generic contactors may vary in contact gap, coil pull-in voltage, and contact silver content — accelerating wear under high-cycle residential loads.
• Install difficulty: 2/5 — Shut off all power at the breaker and the disconnect box before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. Discharge any capacitors in the compartment before touching adjacent terminals.
• Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Verified fit for Carrier model PH4ANG042000BBAA. Also used across a wide range of Carrier, Bryant, and Payne residential heat pump and air conditioning condensers calling for a 1-pole, 24VAC coil, 30A contactor. Always confirm your unit's wiring diagram before ordering. Have a fitment question? Our HVAC parts specialists verify compatibility before you buy — contact us today.