Energy » Circuit Breakers » Miniature Circuit Breakers (MCB)

Building Filters

344

Used Miniature Circuit Breakers (Mcb)

  • 5 Stück Circuit breaker, 230/400V,

    5 Stück Circuit breaker, 230/400V, 5SY4106-6 MCB B6, Siemens, mint condition -40%

    • Manufacturer: Siemens

    5 Stück Circuit breaker, 230/400V, 5SY4106-6 MCB B6, Siemens, mint condition -40% Special price !! If you have a VAT number, we will gladly issue you an invoice without VAT. Top condition like a demonstration ...

    $41 USD
    Herzogenburg, Austria
  • 5 pieces circuit breaker, 400V,

    5 pieces circuit breaker, 400V, 5SY4316-6 MCB B16, Siemens, mint condition -40%

    • Manufacturer: Siemens

    5 pieces circuit breaker, 400V, 5SY4316-6 MCB B16, Siemens, mint condition -40% Special price !! If you have a VAT number, we will gladly issue you an invoice without VAT. Top condition like a demonstration un...

    $115 USD
    Herzogenburg, Austria
  • SIEMENS 5SY61 MCB B6 circuit

    SIEMENS 5SY61 MCB B6 circuit breaker .de

    • Manufacturer: Siemens

    Gambtec template 2 pieces Circuit breaker Manufacturer: Siemens Type: 5SY61 - MCB B6 The photos show the current condition. Basically we would like to point out that the goods to exclude any misunderstandings can...

    $15 USD
    Berlin, Germany
  • NRT50-32 20A 1P+N Circuit breaker

    NRT50-32 20A 1P+N Circuit breaker

      LApplication: is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overload protection function. Combined with a fuse, it can al...

      Wenzhou, China
    • NRT50-32 25A 1P+N Circuit breaker

      NRT50-32 25A 1P+N Circuit breaker

        LApplication: NRT50 1P+N Circuit breaker is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overload protection function. Comb...

        Wenzhou, China
      • NKC9-63 3P Mini Circuit Breaker

        NKC9-63 3P Mini Circuit Breaker

          NKC9-63 3P Mini Circuit Breaker Technical Data Electrical Features Mechanical Features Installation 2 18-3AWG 2 18-3AWG Tightening torque 2.0 N*m 22In-Ibs Dimensions： …

          Wenzhou, China
        • NKC9-63 1P Mini Circuit Breaker

          NKC9-63 1P Mini Circuit Breaker

            NKC9-63 1P Mini Circuit Breaker Technical Data Electrical Features Mechanical Features Installation 2 18-3AWG 2 18-3AWG Tightening torque 2.0 N*m 22In-Ibs Dimensions： …

            Wenzhou, China
          • NRT50-32 15A 1P+N Circuit breaker

            NRT50-32 15A 1P+N Circuit breaker

              NRT50 1P+N Circuit breaker LApplication: NRT50 1P+N Circuit breaker is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overloa...

              Wenzhou, China
            • NRT50L-32 15A 1P+N residual circuit

              NRT50L-32 15A 1P+N residual circuit breaker

                LApplication: NRT50L 1P+N residual circuit breaker is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overload protection func...

                Wenzhou, China
              • NKC9-63 2P Mini Circuit Breaker

                NKC9-63 2P Mini Circuit Breaker

                  NKC9-63 2P Mini Circuit Breaker Technical Data Electrical Features Mechanical Features Installation 2 18-3AWG 2 18-3AWG Tightening torque 2.0 N*m 22In-Ibs Dimensions： …

                  Wenzhou, China
                • NCK9-63 4P MCB Mini Circuit

                  NCK9-63 4P MCB Mini Circuit Breaker

                    NKC9-63 4P MCB Mini Circuit Breaker Technical Data Electrical Features Mechanical Features Installation 2 18-3AWG 2 18-3AWG Tightening torque 2.0 N*m 22In-Ibs Dimensions： …

                    Wenzhou, China
                  • NRT50L-32/25A 1P+N residual circuit breakers

                    NRT50L-32/25A 1P+N residual circuit breakers

                      Application: NRT50L 1P+N residual circuit breaker is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overload protection funct...

                      Wenzhou, China
                    • NRT50L-32/20A 1P+N residual circuit breaker

                      NRT50L-32/20A 1P+N residual circuit breaker

                        Application: NRT50L 1P+N residual circuit breaker is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overload protection funct...

                        Wenzhou, China
                      • NRT50L-32/40A 1P+N Residual circuit breakers

                        NRT50L-32/40A 1P+N Residual circuit breakers

                          Application: NRT50L 1P+N residual circuit breaker is used as a protection switch for power supplying a circuit with AC 50Hz or 60Hz, voltage 115V~240V, current up to 32A. It has inherent overload protection funct...

                          Wenzhou, China
                        • Trusted Seller
                          140G-N5K4-E12 | Circuit Breaker

                          140G-N5K4-E12 | Circuit Breaker

                          • Manufacturer: Eaton Cutler-Hammer

                          140G-N5K4-E12 Circuit Breaker 140G-N5K4-E12 Circuit Breaker The / Automation 140G MCB series is a series of molded case circuit breakers

                          Fujian, China
                        1516171819

                        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.