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    An AI Overview is not available for this searchCan't generate an AI overview right now. Try again later.
    AI Overview
    The 31BB2B4 is a part number for a Definite Purpose (DP) AC Contactor, often associated with HVAC applications such as air conditioning condensers and compressors. 
    Key Specifications 
    • Type: 2-Pole Definite Purpose Contactor.
    • Amperage: 30 Amp (Inductive).
    • Coil Voltage: 24 VAC.
    • Features: Often features silver alloy contacts for better conductivity, and screw terminals with pressure plates for secure wiring.
    • Mounting: DIN rail mount or base mount. 
    Common Applications 
    These contactors are used to switch high-voltage (120/240V) loads in residential and commercial HVAC systems, typically activated by a 24V low-voltage signal from a thermostat. 
    Typical Replacement 
    The 31BB2B4 is frequently replaced by or matched with 2-pole 30-amp contactors from manufacturers like Packard or Mars (e.g., 2-Pole 30 Amp 24 VAC Contactor). 
    Signs of Failure 
    • AC not starting: The condenser fan and compressor do not turn on.
    • Loud humming/buzzing: The coil is energized, but the contacts are not closing properly.
    • Burn marks: Visible signs of pitting or arcing on the contact points. 
    Disclaimer: Always turn off power to the HVAC unit before servicing or replacing contactors. 
    • 5 Signs of AC Contactor Failure: What Homeowners Should Know - Del-Air
      Oct 5, 2025 — Common Signs of AC Contactor Failure * AC Won't Turn On. One of the clearest indicators of contactor failure is when the air condi...
      Del-Air Heating and Air Conditioning
    • NPQPNAFC Contactor AC 220V 63A 4P Modular Smart Home, ...
      Product details * About this product. See more. * Top highlights. "The contactor is sensitive and the carrying capacity is stronge...
      Amazon.com
    • Contactors & Relays - The Home Depot
      Customers Ultimately Purchased. Skip Listing. Packard2 Pole 40 Amp 24 VAC Contactor. (14) $12. 78. Add to Cart. Packard1 Pole 40 A...
      The Home Depot
    • Definite Purpose Contactor 2P 30Amp 24 Volts Air Conditioning ...
      * Condition. New. A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packagi...
      eBay
    • OEM Carrier Bryant Payne Tempstar Contactor Relay 1 Pole ...
      Description. OEM Carrier Bryant Payne Tempstar Contactor Relay 1 Pole 30 Amp Replaces. This is a BRAND NEW Carrier/Bryant/Tempstar...
      North America HVAC
    • 5 Signs of AC Contactor Failure: What Homeowners Should Know - Del-Air
      Oct 5, 2025 — Common Signs of AC Contactor Failure * AC Won't Turn On. One of the clearest indicators of contactor failure is when the air condi...
      Del-Air Heating and Air Conditioning
    • NPQPNAFC Contactor AC 220V 63A 4P Modular Smart Home, ...
      Product details * About this product. See more. * Top highlights. "The contactor is sensitive and the carrying capacity is stronge...
      Amazon.com
    • Contactors & Relays - The Home Depot
      Customers Ultimately Purchased. Skip Listing. Packard2 Pole 40 Amp 24 VAC Contactor. (14) $12. 78. Add to Cart. Packard1 Pole 40 A...
      The Home Depot
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    OMXWOQMP 3TH4391-0BB4 Auxiliary contactor ...


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    People also ask
    How to tell if you have a bad contactor on an AC unit?
    An error has occurred. Please try again later.
    What is T1 T2 T3 contactor?
    The T1, T2, and T3 terminals are where the device or load wires are connected. When the coil is energized, the L1 contact connects to the T1 contact, the L2 contact connects to the T2 contact, and the L3 contact connects to the T3 contact.

    What is a Contactor? | Contactor Basics and Applications - RealPars


    RealPars
    https://www.realpars.com › blog › contactor
    RealPars
    https://www.realpars.com › blog › contactor
    Are AC unit contactors universal?
    An error has occurred. Please try again later.
    Can I replace an AC contactor myself?
    An error has occurred. Please try again later.

    Web results

    ABB 31A820-10 Ac Contactor Supplier


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    Contactors & Relays


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    1 Pole 30 Amp 24 VAC Contactor ... Built to exacting specs, the Packard C130A Contactor, 1 Pole, 30 Amp, 24-Volt Coil have class B insulation. Certified in ...Read more
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    HVAC Contactor Replacements for Air Conditioner


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    OEM Carrier Bryant Payne Tempstar Contactor Relay 1 ...


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    This is a BRAND NEW Carrier/Bryant/Tempstar/Heil/Comfort Maker 24 volt 1 Pole Contactor rated at 30 amps. It is designed to replace ALL 1 Pole 30 Amp ...Read more
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