OEM Carrier Contactor 24V Coil 2-Pole for Model PY3GNA042090NA

This is the factory-specified OEM replacement contactor (part number HN51KB024) for the Carrier PY3GNA042090NA packaged unit. The contactor is the high-voltage relay that your thermostat's 24V control signal energizes to send line voltage to the compressor and condenser fan motor. When the contactor fails — due to pitted or burned contacts, a stuck plunger, or a failed coil — the system will either refuse to start, run continuously without cycling off, or produce a loud chattering or buzzing noise from the electrical panel area.

• Specs: 2-pole contactor | 24V AC coil voltage | Factory-matched contact rating for Carrier PY3GNA042090NA | Direct OEM drop-in replacement for part number HN51KB024
• OEM vs Generic: This OEM contactor uses factory-spec contact materials and coil windings, ensuring proper pull-in voltage and long contact life. Generic contactors may use lower-grade contact alloys prone to early pitting, carbon buildup, and premature failure — especially under high-cycle summer loads.
• Install Difficulty: 3/5 — Always disconnect and lock out power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, 1/4" and 5/16" nut drivers, needle-nose pliers, multimeter. Photograph all wiring connections before removal. Line-voltage terminals remain live until the disconnect is pulled — treat all wiring as energized until confirmed otherwise.
• Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PY3GNA042090NA packaged units. Always verify coil voltage, pole count, and amperage rating on your existing contactor's data label before ordering. Have questions about fitment? Our HVAC parts specialists confirm compatibility before you buy — no guesswork.