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New Miniature Circuit Breakers (Mcb) in Ohio, USA

  • 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,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
  • Siemens,5SY4 108-8,Miniature Circuit Breaker 1P

    Siemens,5SY4 108-8,Miniature Circuit Breaker 1P 230/400V

    • Manufacturer: Siemens

    New unused with original box NOS. 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...

    $20 USD
    Galion, OH
  • SQUARE D,QO240,MINIATURE CIRCUIT BREAKER 40A

    SQUARE D,QO240,MINIATURE CIRCUIT BREAKER 40A 120/240V 2P LOT OF 3 NOS

    • Manufacturer: Square D

    New without original box, lot of 3. 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 pictur...

    $36 USD
    Galion, OH
  • SQUARE D,QOB230,MINIATURE CIRCUIT BREAKER 30A

    SQUARE D,QOB230,MINIATURE CIRCUIT BREAKER 30A 120/240V 2P LOT OF 2 NOS

    • Manufacturer: Square D

    New without original box, lot of 2. 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 pictur...

    $50 USD
    Galion, OH
  • SQUARE D,QOB220,CIRCUIT BREAKERS 20 AMP

    SQUARE D,QOB220,CIRCUIT BREAKERS 20 AMP 2-POLE 120/250V 50/60 HZ PACK OF 5 NEW

    • Manufacturer: Square D

    SQUARE D,QOB220,CIRCUIT BREAKERS 20 AMP 2-POLE 120/250V 50/60 HZ PACK OF 5 NEW 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...

    $105 USD
    Galion, OH

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.