OEM Carrier Contactor 24V 2-Pole for Model PH10JA018000AAAA (HN51KB024)

This OEM contactor is the factory-specified replacement part HN51KB024 for the Carrier PH10JA018000AAAA system. The contactor is the high-voltage relay that bridges the 24V control circuit signal from your thermostat to the high-voltage supply feeding the compressor and condenser fan motor. When it fails, the most common symptoms include the outdoor unit failing to energize at all, the compressor not starting despite the indoor unit running, or audible buzzing/chattering at the contactor itself caused by worn or pitted contact points.

• Specs: 24V coil voltage | 2-pole configuration | Factory-matched contact rating | Direct OEM replacement for part number HN51KB024
• OEM vs Generic: This is the exact OEM part sourced from Carrier. OEM contactors feature factory-rated contact surfaces and coil windings, ensuring proper pull-in voltage and long service life. Generic alternatives often use inferior contact materials that pit and arc prematurely, leading to repeat failures.
• Install Difficulty: 3/5 — Work must be performed with power fully disconnected at the disconnect box and breaker panel. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before removal. Line-voltage terminals are present — exercise extreme caution.
• Warranty: 1-year OEM factory warranty. Orders placed by cutoff time ship same business day from our warehouse.

Compatibility: Designed specifically for the Carrier PH10JA018000AAAA. Always verify OEM part number HN51KB024 against your unit's data plate or existing contactor label before ordering. Not sure it fits? Our HVAC parts specialists are available to confirm fitment before you buy — same-day shipping available on all stocked OEM parts.