OEM Carrier 2-Pole Contactor 24V Coil HN51KC024 for Model HA1BJX042000ABAA

This is the factory OEM replacement contactor (part number HN51KC024) for the Carrier HA1BJX042000ABAA split-system air conditioner. The contactor is a high-voltage relay that receives a 24V signal from your thermostat and closes the circuit to send 240V power to the compressor and condenser fan motor. When a contactor fails — due to pitted or burned contacts, a stuck plunger, or a failed coil — your outdoor unit will not energize at all, or may run continuously without shutting off. These are among the most common summer AC failure calls.

• Specs: 2-pole configuration | 24V AC coil voltage | Rated for single-stage compressor loads | Factory-matched to Carrier HA1BJX042000ABAA specifications
• OEM vs Generic: OEM contactors use silver-alloy contact tips rated for the exact amperage draw of your system. Generic contactors often use lower-grade contact materials that pit and weld faster under high inrush current, reducing service life significantly.
• Install difficulty: 3/5 — Always shut off power at both the disconnect box and the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wire connections before removing the old contactor. Line-voltage terminals remain dangerous — confirm power is off with a non-contact voltage tester.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Designed for the Carrier HA1BJX042000ABAA condenser unit. Always verify your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. If you need fitment confirmation, our parts specialists are available to verify compatibility before you purchase — no guesswork, no return shipping hassles.