OEM Carrier 1-Pole Contactor 24V Coil 25 FLA — HN51KB024 for Model PH13NAZ18000AAAA

This OEM Carrier contactor (part# HN51KB024) is the factory-specified replacement for the Carrier PH13NAZ18000AAAA heat pump condensing unit. The contactor is the high-voltage relay that receives a 24V signal from the thermostat and closes to send line voltage to the compressor and/or condenser fan motor. When the contactor fails — due to pitted contacts, a welded-shut plunger, or a burned coil — the system will either fail to start entirely, run continuously without shutting off, or short-cycle erratically. This is one of the most commonly replaced components in residential HVAC systems.

• Specs: 1-Pole (single-pole) | 24V AC 50/60 Hz 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 tolerances. Generic aftermarket contactors often use lower-grade contact materials that pit and weld faster under repeated switching cycles, leading to premature failure and potential compressor damage.
• Install Difficulty: 2/5 — Always shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wiring before disconnecting terminals to ensure correct reassembly. Verify coil pull-in with a 24V call from the thermostat after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Carrier PH13NAZ18000AAAA heat pump. Always confirm the part number on your unit's data plate or wiring diagram before ordering. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — contact us today and we'll ship it out fast.