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Used Miniature Circuit Breakers (Mcb) in Wisconsin, USA

  • Trusted Seller
    SQUARE D QOB215 P-2780 ($24.99

    SQUARE D QOB215 P-2780 ($24.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” QOB215 MINIATURE CIRCUIT BREAKER QO SERIES 120/240VAC 15A BOLT-ON 2 POLE Local deliveries available, simply message us before purchasing so we can properly adjust the listing for you. Plea...

    $25 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D LX 827 ($34.99

    SQUARE D LX 827 ($34.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” SQUARE D LX 827 MINIATURE CIRCUIT BREAKER 3 POLES 30 AMP

    $35 USD
    Waukesha, WI
  • Trusted Seller
    SQUARE D EHB-24020 ($79.99 OBO)

    SQUARE D EHB-24020 ($79.99 OBO)

    • Manufacturer: Square D

    “Very good conditions.” EHB24020 DISCONTINUED BY MANUFACTURER MINIATURE CIRCUIT BREAKER 20AMP 480Y/277V

    $80 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
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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.