OEM Carrier 1-Pole 30 Amp 24V Contactor (HN51KC024) for Model PH13NB03700GAAAA

This OEM single-pole contactor is the factory-specified replacement for the Carrier PH13NB03700GAAAA heat pump condenser. The contactor functions as a high-voltage relay, controlled by the 24V thermostat signal to connect and disconnect line-voltage power to the compressor. When it fails, symptoms typically include the system not turning on at all, a persistent humming or chattering noise from the outdoor unit, or the compressor running continuously even when cooling demand has been satisfied. Burned or pitted contacts are the most common cause of failure, especially in high-cycling residential systems.

• Specs: 1-Pole | 30A Full Load Amps (FLA) / 150A Locked Rotor Amps (LRA) | 24 VAC Coil Voltage | 50/60 Hz | OEM Part# HN51KC024
• OEM vs Generic: This Factory Authorized Part is engineered to meet exact Carrier Corporation specifications for proven reliability, safe operation, and easy installation. Generic contactors often use lower-grade contact materials that pit and weld faster under repeated load switching, leading to premature failure.
• Install difficulty: 2/5 — Always disconnect and lock out power at the breaker before servicing. Photograph all wiring before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, and a multimeter to verify 24V coil pull-in after installation. Mount securely and confirm contactor engages on a thermostat call.
• Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Verified factory replacement for Carrier model PH13NB03700GAAAA. Always confirm the part number against your unit's wiring diagram and data plate before ordering. Our team is available to verify fitment before you purchase — don't hesitate to reach out. Order today for same-day shipping.