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  • 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
      • 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
        • 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
          • NKC7-32 1P+N Mini Circuit Breaker

            NKC7-32 1P+N Mini Circuit Breaker

              NKC7-32 1P+N 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
            • NZ47-125 3P Mini Circuit Breaker

              NZ47-125 3P Mini Circuit Breaker

                Application scope NZ47-125 residual current circuit breaker simply fits onto the right hand side of any NZ47 miniature circuit breaker which forms NZ47LE to provide a high level of protection against earth leakag...

                Wenzhou, China
              • NZ47-125 4P Mini Circuit Breaker

                NZ47-125 4P Mini Circuit Breaker

                  Application scope NZ47-125 residual current circuit breaker simply fits onto the right hand side of any NZ47 miniature circuit breaker which forms NZ47LE to provide a high level of protection against earth leakag...

                  Wenzhou, China
                • NZ47-125 1P Mini Circuit Breaker

                  NZ47-125 1P Mini Circuit Breaker

                    Application scope NZ47-125 residual current circuit breaker simply fits onto the right hand side of any NZ47 miniature circuit breaker which forms NZ47LE to provide a high level of protection against earth leakag...

                    Wenzhou, China
                  • NZ47-125 2P Mini Circuit Breaker

                    NZ47-125 2P Mini Circuit Breaker

                      Application scope NZ47-125 residual current circuit breaker simply fits onto the right hand side of any NZ47 miniature circuit breaker which forms NZ47LE to provide a high level of protection against earth leakag...

                      Wenzhou, China
                    • NZ47-63 3P Mini Circuit Breaker

                      NZ47-63 3P Mini Circuit Breaker

                        NZ47-63 3P MCB Mini Circuit Break er Technical Data Electrical Features Mechanical Features Installation 2 18-3AWG 2 18-3AWG Tightening torque 2.0 N*m 22In-Ibs Dimensions： Technical Data Electrical Features Mecha...

                        Wenzhou, China
                      • NZ47-63 4P Mini Circuit Breaker

                        NZ47-63 4P Mini Circuit Breaker

                          NZ47-63 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
                        • NZ47-63s 2P MCB Mini Circuit

                          NZ47-63s 2P MCB Mini Circuit Breaker

                            NZ47-63s 2P 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
                          • NZ47-63s 3P MCB Mini Circuit

                            NZ47-63s 3P MCB Mini Circuit Breaker

                              NZ47-63s 3P 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
                            • NCB1-125 3P Mini Circuit Breaker

                              NCB1-125 3P Mini Circuit Breaker

                                NCB1-125 3P 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
                              • NKC7-63 3P Mini Circuit Breaker

                                NKC7-63 3P Mini Circuit Breaker

                                  NKC7-63 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
                                123

                                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.