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New Miniature Circuit Breakers (Mcb) in 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,QOB230,MINIATURE CIRCUIT BREAKER 30A

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

    • Manufacturer: Square D
    • Model: QOB230

    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,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,QO130VH,Circuit Breaker 30A 120/240V

    Square D,QO130VH,Circuit Breaker 30A 120/240V 1 Pole Lot Of 2 NOS

    • Manufacturer: Square D

    New in original boxes, lot of 2. 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 pict...

    $40 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
    • Model: QOB220

    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
  • Trusted Seller
    Allen Bradley Miniature Circuit Breaker

    Allen Bradley Miniature Circuit Breaker 1489-M3-D080 Series D

    • Manufacturer: Allen-Bradley

    You are buying one (1) Allen Bradley Miniature Circuit Breaker 1489-M3-D080 Series D. It is three pole, trip curve D, 8 amps. It is new but has no box.

    $149 USD
    Austinville, VA
  • Trusted Seller
    Eaton FAZ-D16/1-SP 167195 Miniature Circuit

    Eaton FAZ-D16/1-SP 167195 Miniature Circuit Breaker

    • Manufacturer: Eaton

    All parts ordered before 3:30 pm (EST) typically ship same day via UPS, FedEx, or USPS! If the order is placed after 3:30 pm and you still would like it send out same day, feel free to reach out to us and we will...

    $26 USD
    Muskegon, MI
  • Trusted Seller
    EATON WMZS3B15 MINIATURE CIRCUIT BREAKER

    EATON WMZS3B15 MINIATURE CIRCUIT BREAKER UL1077 10KA STOCK K-3627

    • Manufacturer: Eaton

    EATON WMZS3B15 MINIATURE CIRCUIT BREAKER UL1077 10KA STOCK K-3627

    $140 USD
    Montgomeryville, PA
  • Eaton FAZ-C10/1-NA-SP EN/IEC 10 A,

    Eaton FAZ-C10/1-NA-SP EN/IEC 10 A, 277/480V AC Circuit Breaker. 4E-7

    • Manufacturer: Eaton

    Eaton FAZ-C10/1-NA-SP EN/IEC 10 A, 277/480V AC Circuit Breaker. OEM spares from a brewery/ bottling plant maintenance room's canceled expansion project tool crib. We repair all types of industrial automation incl...

    $63 USD
    Duncan, SC
  • Siemens 5SY4302-7 Miniature Circuit Breaker,

    Siemens 5SY4302-7 Miniature Circuit Breaker, 400V. 4D-48

    • Manufacturer: Siemens

    Items are spares/engineering demo hookups that were pulled from an industrial working environment. We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, ...

    $59 USD
    Duncan, SC
  • Siemens 5SY4330-7 Miniature Circuit Breaker,

    Siemens 5SY4330-7 Miniature Circuit Breaker, 400V. 4D-48

    • Manufacturer: Siemens

    Items are spares/engineering demo hookups that were pulled from an industrial working environment. We repair all types of industrial automation including AC Servo Drives, Servo Motors, Operator Interface Panels, ...

    $178 USD
    Duncan, SC
  • Trusted Seller
    ABB SU 201M C20A 20A

    ABB SU 201M C20A 20A Circuit Breaker Single Pole *NEW*

    • Manufacturer: ABB

    PLEASE REVIEW: We would ask that potential buyers please view the photographs carefully, and understand what you are buying. All questions should be submitted prior to your purchase. *Your purchase includes a 30 ...

    $30 USD
    Suwanee, GA
  • Trusted Seller
    Eaton FAZ-D30/2-NA Miniature Circuit Breaker,

    Eaton FAZ-D30/2-NA Miniature Circuit Breaker, 30A, 480Y/277VAC

    • Manufacturer: Eaton

    PLEASE REVIEW: We would ask that potential buyers please examine the photographs carefully, and understand what you are buying. All questions should be submitted prior to your purchase. Your purchase includes a 3...

    $40 USD
    Suwanee, GA
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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.