OEM Carrier 1-Pole Contactor 24V 25 Amp HN51KB024 for Model PH12NA02400GAGAA

This is the genuine OEM single-pole contactor (part number HN51KB024) factory-specified for the Carrier PH12NA02400GAGAA heat pump / condensing unit. The contactor is the high-voltage relay that bridges 240V line power to your compressor and condenser fan motor whenever the 24V thermostat signal energizes the coil. When the contactor fails — due to pitted or welded contacts, a burned coil, or mechanical sticking — the system will either fail to start entirely, short-cycle immediately after startup, or in the case of welded contacts, run continuously even when cooling is not called for.

• Specs: 1-Pole | 24V AC 50/60Hz coil | 25 FLA (Full Load Amps) | Factory-matched OEM tolerances for Carrier PH12NA02400GAGAA
• OEM vs Generic: OEM contactors use factory-spec contact alloys and coil windings rated to exact pull-in voltage. Generic contactors often use inferior contact materials that pit faster under high-cycle residential loads, shortening compressor life and increasing nuisance lockouts.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before opening the control panel. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph or label every wire before disconnecting — incorrect reassembly can damage the control board.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH12NA02400GAGAA. Verify your unit's data plate shows part number HN51KB024 or cross-reference against your unit's wiring diagram before ordering. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us anytime.