OEM Carrier 2-Pole Contactor 24V Coil for Model PY3PNA018040NA

This is the factory-specified OEM replacement contactor for the Carrier PY3PNA018040NA packaged unit. The contactor is the high-voltage relay that responds to your thermostat's 24V signal and closes the circuit to deliver line voltage to the compressor and condenser fan motor. When a contactor fails, symptoms include the system failing to turn on at all, a loud humming or chattering from the outdoor unit, or visible pitting and burning on the contactor's contact points.

• Specs: OEM Part Number HN51KB024 | 2-Pole design | 24V control coil | Factory-matched contact rating for Carrier PY3PNA018040NA — verify amperage on your unit's data plate before ordering
• OEM vs Generic: This OEM contactor meets Carrier's exact coil voltage, contact gap, and ampacity tolerances. Generic contactors often use inferior contact materials that pit faster under inductive load, leading to premature failure and potential compressor damage.
• Install difficulty: 3/5 — Always disconnect and lock out power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before removal. The line-voltage terminals must be treated as live hazards until power is confirmed off.
• Warranty: 1-year OEM factory warranty. Ships same business day from our NationalHVACParts.com warehouse when ordered before 3PM local time.

Compatibility: Designed for the Carrier PY3PNA018040NA packaged unit using OEM part number HN51KB024. Always cross-reference the part number on your existing contactor's label and confirm coil voltage and pole count match your application before installing. Our parts specialists are available to verify fitment — contact us before you order if you have any questions.