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OEM Carrier Contactor 1-Pole 25A 24V Coil HN51KB024 — PY3GNA030040AA
Carrier

OEM Carrier Contactor 1-Pole 25A 24V Coil HN51KB024 — PY3GNA030040AA

SKU: CARRIE-PY3GNA030040AA-CONTACTOR-HN51KB024 Brand: Carrier
✓ Guaranteed to fit PY3GNA030040AA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 1-Pole 25 Amp Contactor (HN51KB024) for Model PY3GNA030040AA

This OEM contactor is the factory-specified replacement for the Carrier PY3GNA030040AA condensing unit. The contactor acts as the high-voltage relay in your system's control circuit: when the thermostat calls for cooling, the 24V coil energizes and closes the contact points, sending line voltage to the compressor and condenser fan motor. A failed contactor typically results in the outdoor unit failing to respond to the thermostat call, a humming compressor that won't start, or — in the case of welded/pitted contacts — a unit that runs continuously and won't shut off.

  • Specs: 1-Pole configuration | 25 Amp load rating | 24V AC coil voltage | OEM part number HN51KB024 | Factory-matched contact grade and coil resistance
  • OEM vs Generic: This is a genuine Carrier OEM contactor. Generic aftermarket contactors often use lower-grade contact alloys that pit and weld faster under high-cycle loads — especially in hot climates. OEM ensures factory coil pull-in voltage and contact gap specifications are met.
  • Install Difficulty: 2/5 — Always disconnect power at the disconnect box and verify zero voltage with a multimeter before touching terminals. Photograph all wiring before removal. Tools needed: flathead screwdriver, needle-nose pliers, multimeter. Swap line, load, and coil leads one at a time to avoid miswiring.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — get your system back online fast.

Compatibility: Designed for Carrier model PY3GNA030040AA. Verify OEM part number HN51KB024 against your unit's wiring diagram or parts list before ordering. Our fitment team is available to confirm compatibility — don't hesitate to reach out before you buy.

Shipping Information

  • Orders placed before 3PM CST ship same business day
  • Standard delivery: 2-5 business days
  • Express shipping available at checkout
  • Free shipping on orders over $99
  • Tracking number emailed upon shipment

Return Policy

  • 30-day returns on unused parts in original packaging
  • Electrical parts (capacitors, contactors, control boards) are final sale once installed
  • Email info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Contactor fit my Carrier OEM Carrier Contactor 1-Pole 25A 24V Coil HN51KB024 — PY3GNA030040AA?
Yes. This is the factory-specified OEM contactor for the Carrier OEM Carrier Contactor 1-Pole 25A 24V Coil HN51KB024 — PY3GNA030040AA. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.
How do I replace the contactor on my Carrier OEM Carrier Contactor 1-Pole 25A 24V Coil HN51KB024 — PY3GNA030040AA?
Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.
My AC clicks but the compressor won’t turn on. What’s wrong?
Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.
Is this contactor compatible with Bryant or Payne too?
Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.
Should I use OEM or aftermarket for my Carrier contactor?
OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.
How fast does National HVAC Parts ship?
Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.
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Mike Rivera
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