OEM Carrier Contactor 24V Coil 2-Pole for Model PH3ZNB024000AA

This is the factory OEM contactor (part number HN51KC024) for the Carrier PH3ZNB024000AA heat pump system. The contactor is a high-voltage relay controlled by the 24V thermostat signal. When the thermostat calls for cooling or heating, the contactor closes its contacts to send line voltage to the compressor and condenser fan motor. A failed contactor is one of the most common reasons an outdoor unit will not energize — symptoms include the air handler running normally while the outdoor unit stays completely off, audible chattering or buzzing at the contactor, or visible burning/pitting on the contact points.

• Specs: 2-Pole design | 24V AC coil voltage | Factory-matched contact rating | Direct OEM replacement for part number HN51KC024
• OEM vs Generic: This OEM contactor is built to Carrier's exact coil pull-in voltage and contact ampacity specifications. Generic contactors may use lower-grade silver-alloy contacts that pit faster under load, increasing the risk of premature failure and compressor damage.
• Install difficulty: 3/5 — Always shut off power at both the breaker panel and the disconnect box before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, and a phone or camera to photograph wiring before removal. Transfer wires one at a time to avoid miswiring.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model PH3ZNB024000AA. Always verify the coil voltage and pole configuration on your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your system back up and running fast.