OEM Carrier 1-Pole Contactor 24V 25 Amp for Model PH10JA01800GAEAA — Part# HN51KB024

This is the OEM factory-specified contactor for the Carrier PH10JA01800GAEAA packaged unit. The contactor is the high-voltage switching relay at the heart of your system's electrical circuit — when the thermostat sends a 24V call for cooling or heating, the contactor coil energizes, closing the main contacts and delivering line voltage to the compressor and/or condenser fan motor. When a contactor fails, symptoms range from a complete no-start condition (coil won't pull in) to a stuck-on unit that won't shut off (contacts welded from heat and arcing), or intermittent compressor cycling that causes repeated tripping. Left unaddressed, a failing contactor can burn wiring, damage the compressor, and void equipment warranties.

• Specs: 1-Pole (Single Pole) | 24V AC 50/60Hz Coil | 25 FLA (Full Load Amps) | 35 RES | Factory OEM part number HN51KB024
• OEM vs Generic: This is a genuine Carrier OEM contactor built to exact factory contact gap, coil resistance, and thermal ratings. Generic aftermarket contactors frequently use lower-grade silver-alloy contacts that pit and weld faster under high-cycle load — especially in packaged units like the PH10JA01800GAEAA that cycle frequently in peak season.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph all wire terminations before removal. Discharge any capacitors in the panel before reaching near adjacent components. Swap wires one at a time to avoid miswiring the load and line lugs.
• Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Designed as the direct OEM replacement for Carrier model PH10JA01800GAEAA. Always verify your unit's wiring diagram and confirm the 1-pole, 24V coil specification on your original contactor's data label before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — contact us today and get your unit back online fast.