OEM Carrier Single-Pole Contactor 1-Pole 24V 30A — HN51KC024 for Model PH16NC01800GAAAA

This is the factory-authorized OEM replacement contactor for the Carrier PH16NC01800GAAAA packaged heat pump unit, carrying Carrier part number HN51KC024. The contactor is the high-voltage relay at the heart of your system's electrical switching circuit — when the 24V thermostat signal energizes its coil, the contacts close and line voltage is delivered to the compressor and/or condenser fan motor. A failed contactor is one of the most common causes of a complete no-cool or no-heat situation. Symptoms include the outdoor unit humming but not starting, the compressor running continuously even after a setpoint is reached (welded contacts), or total failure to respond to a thermostat call.

• Specs: 1-Pole | 24 VAC coil | 30 Amps FLA | 150 Amps LRA | 50/60 Hz | Factory OEM part HN51KC024
• OEM vs Generic: Factory Authorized Parts are engineered to meet exact Carrier tolerances for contact gap, coil pull-in voltage, and arc suppression. Generic contactors often use lower-grade contact alloys that pit faster under compressor inrush loads, leading to premature failure and potential compressor damage.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before opening the control compartment. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers. Photograph all wiring connections before disconnecting. Verify 24V coil pull-in with a multimeter after installation.
• Warranty: 1-year OEM factory warranty. In stock and ships the same business day from our warehouse.

Compatibility: Engineered for Carrier model PH16NC01800GAAAA packaged heat pump units. Always confirm the part number against your unit's wiring diagram and data plate before ordering. Our fitment team is standing by to verify compatibility — contact us before you buy if you have any questions.