Energy » Circuit Breakers » Miniature Circuit Breakers (MCB)

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Used Miniature Circuit Breakers (Mcb)

  • Siemens,5SX22 D16,Circuit Breaker

    Siemens,5SX22 D16,Circuit Breaker

    • Manufacturer: Siemens

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $12 USD
    Galion, OH
  • SQUARE D,QOB315,CIRCUIT BREAKER 3-POLE 15

    SQUARE D,QOB315,CIRCUIT BREAKER 3-POLE 15 AMP NOS

    • Manufacturer: Square D

    SQUARE D,QOB315,CIRCUIT BREAKER 3-POLE 15 AMP NOS What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will n...

    $35 USD
    Galion, OH
  • Square D,QO260,Circuit Breaker 60A 120/240Vac

    Square D,QO260,Circuit Breaker 60A 120/240Vac

    • Manufacturer: Square D

    Used and in good condition. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to ma...

    $20 USD
    Galion, OH
  • Fuji,CP32D,Miniature Circuit Breaker 2p 3A

    Fuji,CP32D,Miniature Circuit Breaker 2p 3A

    • Manufacturer: Fuji

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $12 USD
    Galion, OH
  • SQUARE D,QOB3201021,CIRCUIT BREAKER 20A 240V

    SQUARE D,QOB3201021,CIRCUIT BREAKER 20A 240V 3P

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $110 USD
    Galion, OH
  • Square D,QOB3301021,Circuit 'Breaker 30A 240V

    Square D,QOB3301021,Circuit 'Breaker 30A 240V 3P

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $60 USD
    Galion, OH
  • SQUARE D,QO390,CIRCUIT BREAKER 90A 240V

    SQUARE D,QO390,CIRCUIT BREAKER 90A 240V 3P

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $40 USD
    Galion, OH
  • SQUARE D,QOB2301021,CIRCUIT BREAKER 30A 240V

    SQUARE D,QOB2301021,CIRCUIT BREAKER 30A 240V 2P

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $155 USD
    Galion, OH
  • Square D,QO250,Circuit Breaker 50A 240V

    Square D,QO250,Circuit Breaker 50A 240V 2P

    • Manufacturer: Square D

    Used and in good condition. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to ma...

    $15 USD
    Galion, OH
  • Square D,QO260,Circuit Breaker 60A 240V

    Square D,QO260,Circuit Breaker 60A 240V 2P

    • Manufacturer: Square D

    Used and in good condition. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to ma...

    $15 USD
    Galion, OH
  • SQUARE D,QO230,CIRCUIT BREAKER 30A 120/240V

    SQUARE D,QO230,CIRCUIT BREAKER 30A 120/240V 2P

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $15 USD
    Galion, OH
  • Square D,QO215,Circuit Breaker 15A 120/240V

    Square D,QO215,Circuit Breaker 15A 120/240V 2P

    • Manufacturer: Square D

    Used and in good condition. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to ma...

    $10 USD
    Galion, OH
  • SQUARE D,QO240,CIRCUIT BREAKER 40 AMP

    SQUARE D,QO240,CIRCUIT BREAKER 40 AMP 2POLE 120/240V

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $40 USD
    Galion, OH
  • SQUARE D,QO260,CIRCUIT BREAKER 60A 120/240V

    SQUARE D,QO260,CIRCUIT BREAKER 60A 120/240V 2P

    • Manufacturer: Square D

    What's Included? See photos. We try our best to provide full details of each item and any included accessories, but if it's not shown in the photos then it will not be included with the item. 30-Day Easy Returns ...

    $20 USD
    Galion, OH
  • SQUARE D,QO250,CIRCUIT BREAKER 50A 120/240V

    SQUARE D,QO250,CIRCUIT BREAKER 50A 120/240V 2P

    • Manufacturer: Square D

    Used and in good condition. Please see pictures for details and condition. You will receive what’s in the pictures. If we have multiples of the same item, the pictures may differ. Please review the pictures to ma...

    $15 USD
    Galion, OH
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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.