OEM Carrier 1-Pole Contactor 24V 30A — HN51KB024 for Model PH2PNB048000AB

This is the genuine OEM Carrier contactor (part number HN51KB024), factory-specified for the Carrier PH2PNB048000AB heat pump condenser unit. The contactor is the critical high-voltage relay that closes the 240V power circuit to the compressor and/or condenser fan motor every time your thermostat calls for cooling or heating. When it fails — due to worn contacts, a burned coil, or a stuck/welded position — your outdoor unit may hum without starting, fail to respond to the thermostat, or run continuously without shutting off.

• Specs: 1 Pole | 24V AC 50/60Hz Coil | 30A Full Load Amps (FLA) | 150A Locked Rotor Amps (LRA) | Definite Purpose Contactor design
• OEM vs Generic: This factory OEM contactor uses precision contact materials and coil windings matched to Carrier specifications. Generic aftermarket contactors often use lower-grade contact alloys that pit and weld faster under high-cycle residential use, leading to repeat failures.
• Install difficulty: 2/5 — Turn off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, phone camera (photograph all wiring before disconnecting). Discharge any stored capacitor charge in the unit before working near electrical components.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PH2PNB048000AB heat pump condensers. Always verify your existing contactor's pole count, coil voltage, and amperage rating against your unit's data plate before ordering. Our fitment team is available to confirm compatibility before you buy — no guesswork required.