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OEM Carrier 40A Contactor 2-Pole 24V Coil for HB1BJX042000AAAA
Carrier

OEM Carrier 40A Contactor 2-Pole 24V Coil for HB1BJX042000AAAA

SKU: CARRIE-HB1BJX042000AAAA-CONTACTOR-HN51KC024 Brand: Carrier
✓ Guaranteed to fit HB1BJX042000AAAA — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 2-Pole Contactor 24V Coil for Model HB1BJX042000AAAA

This is the factory-specified OEM replacement contactor (part number HN51KC024) for the Carrier HB1BJX042000AAAA split-system unit. The contactor is a high-voltage relay that bridges 240V line power to the compressor and condenser fan motor when the thermostat calls for cooling. When the contactor fails — through pitted contacts, a burned coil, or contacts that weld shut — the system will either refuse to start entirely, fail to shut off, or trip the circuit breaker repeatedly. Replacing the contactor is one of the most common and cost-effective HVAC repairs available.

  • Specs: 2-pole configuration | 24V AC coil voltage | 240V load side | 30–40A contact rating | Direct OEM replacement part number HN51KC024
  • OEM vs Generic: OEM contactors use silver-alloy contact tips rated to factory arc-interruption specs. Generic contactors frequently use lower-grade alloys that pit faster under the high inrush current of compressor startup, leading to premature failure within one to two seasons.
  • Install difficulty: 2/5 — Disconnect all power at the disconnect box and confirm voltage is zero before proceeding. Tools needed: flathead and Phillips screwdrivers, 1/4" nut driver, needle-nose pliers, non-contact voltage tester. Photograph all wiring before removing the old contactor.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: This contactor is the direct OEM replacement for Carrier model HB1BJX042000AAAA. Always verify your unit's data plate for coil voltage and amperage rating before ordering to ensure proper fitment. Not sure if this is the right part? Our HVAC parts specialists verify fitment before you buy — reach out before placing your order and we'll confirm compatibility at no charge.

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 HB1BJX042000AAAA?
Yes. This is the factory-specified OEM contactor for the Carrier HB1BJX042000AAAA. 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 HB1BJX042000AAAA?
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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