OEM Carrier Contactor HN51KB024 for Model HA1BJX024000AEAA

This is the factory OEM replacement contactor (part number HN51KB024) for the Carrier HA1BJX024000AEAA split-system air conditioner. The contactor is a high-voltage relay controlled by the 24V signal from your thermostat. When the thermostat calls for cooling, the contactor closes its contacts to deliver line voltage to the compressor and condenser fan motor. A failed contactor is one of the most common reasons an air conditioner won't turn on — symptoms include a system that clicks but won't start, contacts that are visibly burned or pitted, or a unit that runs continuously without cycling off due to welded contacts.

• Specs: 2-pole configuration | 24V AC coil voltage | Heavy-duty contact rating | Direct OEM replacement per factory specification for Carrier HN51KB024
• OEM vs Generic: This OEM contactor is manufactured to exact Carrier factory tolerances for contact rating and coil pull-in voltage. Generic aftermarket contactors frequently use lower-grade contact materials that pit and weld prematurely, leading to repeat failures within a single cooling season.
• Install difficulty: 3/5 — Requires shutting off power at the disconnect box and breaker panel before beginning work. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, and a camera or phone to photograph existing wiring before removal. Transfer one wire at a time to avoid miswiring.
• Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Carrier HA1BJX024000AEAA air conditioning unit. Always verify coil voltage and pole configuration against your unit's wiring diagram or data plate before ordering. Our HVAC parts specialists are available to confirm fitment prior to purchase — reach out before you order and we'll make sure you get the right part the first time.