Energy » Circuit Breakers » Miniature Circuit Breakers (MCB)

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Used Miniature Circuit Breakers (Mcb)

  • Trusted Seller
    SQUARE D QOT1515 ($24.99 OBO)

    SQUARE D QOT1515 ($24.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” QOT1515 MINIATURE CIRCUIT BREAKER QO SERIES 120/240 V 15 A TANDEM SINGLE POLE 10 KA PLUG-IN MOUNT Local deliveries available, simply message us before purchasing so we can properly adjust ...

    $25 USD
    Waukesha, WI
  • Trusted Seller
    SCHNEIDER QOT2020C 20 A ($24.99

    SCHNEIDER QOT2020C 20 A ($24.99 OBO)

    • Manufacturer: Schneider

    “Very good conditions.” QOT2020C DISCONTINUED BY MANUFACTURER MINIATURE CIRCUIT BREAKER QO SERIES 120/240 VAC 20 AMP Local deliveries available, simply message us before purchasing so we can properly adjust the l...

    $25 USD
    Waukesha, WI
  • Trusted Seller
    SCHNEIDER QOB130 ($19.99 OBO)

    SCHNEIDER QOB130 ($19.99 OBO)

    • Manufacturer: Schneider

    “Very good conditions.” QOB130 MINIATURE CIRCUIT BREAKER QO SERIES 120/240 VAC 30 A BOLT-ON 1 POLE Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Pl...

    $20 USD
    Waukesha, WI
  • Trusted Seller
    SIEMENS 5SY4106-7 ($19.99/EACH OBO)

    SIEMENS 5SY4106-7 ($19.99/EACH OBO)

    • Manufacturer: Siemens

    “Very good conditions.” 5SY41067 MINIATURE CIRCUIT BREAKER 6 AMP 1 POLE 230/400 VAC 10KA BREAKING CAPACITY C-CURVE DIN RAIL MOUNT Local deliveries available, simply message us before purchasing so we can properly...

    $20 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D LX 784 ($49.99/EACH

    SQUARE D LX 784 ($49.99/EACH OBO)

    • Manufacturer: Square D

    “Very good conditions.” QO330 MINIATURE CIRCUIT BREAKER QO SERIES 30 AMP 3 POLE 240 VAC 10 KA PLUG IN MOUNT

    $50 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D LP 7327 ($34.99

    SQUARE D LP 7327 ($34.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” SQUARE D LP 7327 QO230 MINIATURE CIRCUIT BREAKER QO SERIES 30 AMP 2 POLE 120/240 VAC 10 KA PLUG IN MOUNT

    $35 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D LX-773 ($34.99 OBO)

    SQUARE D LX-773 ($34.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” SQUARE D LX-773 QO220 MINIATURE CIRCUIT BREAKER QO SERIES 20 AMP 2 POLE 120/240 VAC 10 KA PLUG IN MOUNT

    $35 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D QOB NE-6631 ($29.99

    SQUARE D QOB NE-6631 ($29.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” SQUARE D QOB NE-6631 HACR TYPE MINIATURE CIRCUIT BREAKER QO SERIES 120/240 VAC 15 A BOLT-ON 3 POLE Local deliveries available, simply message us before purchasing so we can properly adjust...

    $30 USD
    Waukesha, WI
  • Trusted Seller
    SCHNEIDER QO130 ($19.99 OBO)

    SCHNEIDER QO130 ($19.99 OBO)

    • Manufacturer: Schneider

    “Very good conditions.” QO130 MINIATURE CIRCUIT BREAKER QO SERIES 120/240 VAC 30 A PLUG-IN MOUNT 1 POLE Local deliveries available, simply message us before purchasing so we can properly adjust the listing for yo...

    $20 USD
    Waukesha, WI
  • Trusted Seller
    Allen-Bradley 2193LE 225A MCB 42

    Allen-Bradley 2193LE 225A MCB 42 CKT Circuit Breaker Panelboard

    • Manufacturer: Allen-Bradley

    Used Allen-Bradley 2193LE 225A MCB 42 CKT Circuit Breaker Panelboard. 225 A, MCB 42CKT 4-Wire 120/208V/3PH/60Hz (20) 20Amp Westinghouse, Circuit Breaker, 1 Pole Unit (22) 15Amp Westinghouse, Circuit Breaker, 1 Po...

    $395 USD
    Millis, MA
  • Unused Allen Bradley 1489-M2C100 Molded

    Unused Allen Bradley 1489-M2C100 Molded Case Miniature Circuit Breaker

    • Manufacturer: Allen-Bradley

    Unused Allen Bradley 1489-M2C100 Molded Case Miniature Circuit Breaker Unused Allen Bradley 1489-M2C100 Molded Case Miniature Circuit Breaker Click images to enlarge Description INV 7859 Unused Allen Bradley 1489...

    Savage, MN
  • Eaton Circuit Breaker C15 1000-3

    Eaton Circuit Breaker C15 1000-3 400V WMZS2C15 10kA 227/480VAC

    • Manufacturer: Eaton

    Eaton Circuit Breaker C15 1000-3 400V WMZS2C15 10kA 227/480VAC WMZX2C15 UL1077 Miniature Circuit Breaker 10 kA Icu = 15 kA 2 Available price is per unit Made in Spain Eaton Circuit Breaker C15 1000-3 400V WMZS2C1...

    Watertown, CT
  • Trusted Seller
    Auction
    CHTAIXI DZ47NZ-125 B125 Circuit Breaker

    CHTAIXI DZ47NZ-125 B125 Circuit Breaker with Mounting Rail

      2-pole miniature circuit breaker by CHTAIXI, model DZ47NZ-125 B125, includes aluminum DIN rail mount. CE certified electrical protection device for residential and commercial applications. Open Box

      Andover, KS
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    • Trusted Seller
      Auction
      Eaton Cutler-Hammer MCB mMCT C

      Eaton Cutler-Hammer MCB mMCT C Curve 4 Pole 100A Circuit Breaker mMCT-C100/4 / CASE OF 3 BREAKERS

      • Manufacturer: Eaton

      Eaton Cutler-Hammer MCB mMCT C Curve 4 Pole 100A Circuit Breaker mMCT-C100/4 / CASE OF 3 BREAKERS Manufacturer: Eaton Cutler-Hammer Product Line: Miniature Circuit Breakers mMCT MPN: mMCT-C100/4 APN: 129674 UPC: ...

      Houston, TX
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    • Trusted Seller
      Auction
      Eaton Cutler-Hammer MCB mMCT C

      Eaton Cutler-Hammer MCB mMCT C Curve 4 Pole 100A Circuit Breaker mMCT-C100/4 / CASE OF 3 BREAKERS

      • Manufacturer: Eaton

      Eaton Cutler-Hammer MCB mMCT C Curve 4 Pole 100A Circuit Breaker mMCT-C100/4 / CASE OF 3 BREAKERS Manufacturer: Eaton Cutler-Hammer Product Line: Miniature Circuit Breakers mMCT MPN: mMCT-C100/4 APN: 129674 UPC: ...

      Houston, TX
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    Overview

    Miniature circuit breakers (MCBs) are compact protective switches that interrupt electrical flow in low‑voltage circuits when overloads or short circuits occur. Widely used in residential, commercial and light industrial panels, they offer resettable protection and come in single‑ to multi‑pole versions, various current ratings, breaking capacities and trip curves. MCBs typically mount on DIN rails and use thermal‑magnetic mechanisms; select units that match local standards, busbar size and application requirements.

    FAQ

    What should I check when buying an MCB?

    Verify the nominal current (In), breaking capacity (kA), trip curve (B, C, D), number of poles, mounting type (DIN rail), and compliance with local standards (IEC/UL). Check physical condition, brand reputation and whether spare parts or datasheets are available.

    How should MCBs be packed and shipped safely?

    Ship in original or padded boxes to protect terminals and housing. Secure against moisture and vibration, label fragile electrical components, and use a carrier familiar with electrical goods. Include compliance certificates for customs if shipping internationally.

    What routine maintenance or testing do MCBs need?

    Perform visual inspections, tighten terminal connections to torque specs, cycle switches periodically, and conduct insulation and trip tests with appropriate equipment. Replace units showing overheating, physical damage, or inconsistent trips.