OEM Carrier Single-Pole Contactor 25A 24V Coil — Model PH10JA030000ACAA

This is the genuine OEM replacement contactor for the Carrier PH10JA030000ACAA, factory part number HN51KB024. The contactor is the high-voltage relay that receives a 24V signal from the thermostat or control board and closes the circuit to energize the compressor and/or condenser fan motor. When it fails, symptoms include the outdoor unit not turning on, the compressor humming without starting, contacts welded shut causing the unit to run continuously, or a burnt smell from pitted and arced contact points.

• Specs: 1-Pole (Single Pole) | 25 FLA (Full Load Amps) | 35 RES (Resistive Amps) | 24V 50/60Hz coil voltage | OEM Part # HN51KB024
• OEM vs Generic: This is a genuine Carrier factory-authorized part, ensuring exact coil pull-in voltage, contact geometry, and terminal spacing. Generic contactors may have looser tolerances on coil pull-in voltage, leading to premature failure or unreliable switching in high-cycle residential applications.
• Install Difficulty: 2/5 — Shut off power at the disconnect box and verify zero voltage with a multimeter before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph all wiring connections before disconnecting — coil leads are low voltage (24V), line terminals are high voltage (240V). Replace like-for-like, matching pole count and amperage.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PH10JA030000ACAA. Verify your unit's data plate and existing contactor specifications (pole count, FLA rating, and coil voltage) 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 confirm compatibility fast.