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OEM Carrier Contactor 1-Pole 24V 25 Amp for PH12NA024000ADAA
Carrier

OEM Carrier Contactor 1-Pole 24V 25 Amp for PH12NA024000ADAA

SKU: CARRIE-PH12NA024000ADAA-CONTACTOR-HN51KB024 Brand: Carrier
✓ Guaranteed to fit PH12NA024000ADAA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 1-Pole Contactor 24V 25 Amp — HN51KB024 for Model PH12NA024000ADAA

This is the factory-specified OEM single-pole contactor for the Carrier PH12NA024000ADAA packaged unit. The contactor is the high-voltage switching relay that receives a 24V signal from your thermostat and closes the circuit to energize the compressor and/or fan motor. When the contactor fails — through burned contacts, a welded coil, or a pitted switching surface — the system will either fail to start entirely, run continuously without shutting off, or make a loud buzzing/humming noise with no cooling output. This is one of the most common failure points in any residential or light-commercial HVAC system and is a straightforward DIY replacement.

  • Specs: 1-Pole | 24V 50/60Hz Coil | 25 FLA (Full Load Amps) | OEM Part# HN51KB024 | Factory tolerance-matched contacts for reliable pull-in and drop-out
  • OEM vs Generic: OEM Carrier contactors use factory-spec contact materials and coil windings calibrated to exact pull-in voltage thresholds. Generic contactors may have looser coil tolerances, leading to chatter, premature contact pitting, and shortened service life — especially during high-demand summer operation.
  • Install difficulty: 2/5 — Always shut off power at the disconnect and the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V coil signal). Photograph all wiring connections before removing the old contactor. Transfer wires one at a time to avoid miswiring.
  • Warranty & Shipping: 1-year OEM factory warranty. In stock and ships same business day from our warehouse when ordered before cutoff.

Compatibility: Engineered for the Carrier PH12NA024000ADAA packaged unit. Verify your unit's data plate lists part number HN51KB024 or cross-references a 1-pole, 24V, 25 FLA contactor before ordering. Not sure if this is the right part? Our fitment team will confirm compatibility before you buy — just reach out before placing your order.

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 PH12NA024000ADAA?
Yes. This is the factory-specified OEM contactor for the Carrier PH12NA024000ADAA. 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 PH12NA024000ADAA?
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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