OEM Carrier 1-Pole Contactor HN51KB024 for Model PH10JA018000ACAA

This is the genuine OEM replacement contactor for the Carrier PH10JA018000ACAA packaged HVAC unit. The contactor is the high-voltage relay that receives the 24V signal from your thermostat and closes the circuit to power the compressor and condenser fan motor. When a contactor fails — whether due to burned contacts, a welded coil, or pitted contact points — your system either won't turn on at all, runs continuously without responding to thermostat commands, or trips the breaker repeatedly.

• Specs: 1 Pole | 25A Full Load Amps (FLA) | 24V 50/60Hz Coil | Single-stage operation | Factory OEM part number HN51KB024
• OEM vs Generic: Genuine OEM contactors use silver-alloy contact tips rated for the exact load cycles of your Carrier unit. Generic aftermarket contactors often use inferior contact materials that pit and burn faster, leading to premature failure and repeat service calls.
• Install Difficulty: 2/5 — Always disconnect power at the breaker and wait 5 minutes before opening the contactor panel. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. Swap one wire at a time to avoid miswiring.
• Warranty: 1-year OEM manufacturer warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PH10JA018000ACAA. Verify your existing contactor's pole count, amp rating, and coil voltage against your unit's data plate before ordering. Our HVAC parts specialists are available to confirm fitment — reach out before you order if you have any questions.