OEM Carrier 1-Pole Contactor 24V 25A for Model PY3PNA036090NA — Part# HN51KB024

This is the OEM factory-specified contactor for the Carrier PY3PNA036090NA packaged or split-system unit. The contactor is the primary high-voltage switching relay in your HVAC system — it receives a 24V signal from the thermostat or control board and closes the circuit to energize the compressor and/or condenser fan motor. When the contactor fails, symptoms include a system that won't turn on, a compressor that hums but never starts, contacts that are stuck open or fused closed, or intermittent cooling loss on hot days. Replacing this part is one of the most common and cost-effective HVAC repairs available.

• Specs: 1-Pole | 24V AC 50/60Hz Coil | 25 FLA (Full Load Amps) | 150 LRA (Locked Rotor Amps) | OEM Part# HN51KB024
• OEM vs Generic: This OEM contactor is manufactured to exact Carrier factory tolerances for coil pull-in voltage, contact gap, and arc suppression. Generic aftermarket contactors often use lower-grade contact materials that pit, arc, and weld shut faster — especially under the heavy cycling loads of a 3-ton system like the PY3PNA036090NA.
• Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before touching any terminals. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Always photograph your wiring before disconnecting any leads. Note terminal positions for line, load, and 24V coil wires. Most experienced DIYers complete this swap in under 20 minutes.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered as the factory replacement for Carrier model PY3PNA036090NA. Verify your unit's data plate lists part number HN51KB024 or cross-reference your wiring diagram for a 1-pole, 24V coil, 25A contactor specification before ordering. Our HVAC parts team is available to confirm fitment before you buy — don't guess on a part this critical.