OEM Carrier Contactor 24V Coil 2-Pole for Model PH10JA018000ABAA

This OEM contactor (part number HN51KB024) is the factory-specified replacement for the Carrier PH10JA018000ABAA heat pump system. The contactor is a high-voltage electromagnetic relay that controls power delivery to the compressor and condenser fan motor. When the thermostat calls for cooling or heating, the 24V control circuit energizes the contactor coil, closing the high-voltage contacts and allowing the system to run. A failed contactor commonly causes the outdoor unit to remain completely unresponsive, hum without starting, or exhibit pitted and burned contacts that cause intermittent operation or hard starts.

• Specs: OEM Part Number HN51KB024 | 2-Pole configuration | 24V coil voltage | Factory-rated amperage for Carrier PH10JA018000ABAA heat pump — exact OEM replacement with no modifications required
• OEM vs Generic: This is a genuine OEM Carrier contactor manufactured to exact factory specifications. Generic contactors may use lower-grade contact materials that pit and weld faster under load, shortening service life and risking compressor damage. OEM ensures proper coil pull-in voltage and contact rating.
• Install Difficulty: 3/5 — Work involves 240V high-voltage wiring. Shut off power at both the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, and wire labels or tape. Photograph all wiring before removal. Recommend licensed HVAC technician for first-time installers.
• Warranty: 1-year OEM factory warranty against defects. In-stock and ships same business day from our NationalHVACParts.com warehouse.

Compatibility: Designed as a direct OEM drop-in replacement for Carrier model PH10JA018000ABAA. Always verify your existing contactor's coil voltage, pole count, and amperage rating against your unit's data plate before ordering. Our parts specialists are available to confirm fitment — contact us before you order if you have any questions.