1.Product Overview:

NDB2F-125 meter external circuit breaker is specially developes to solve the problem of the prepaid meter external circuit breaker failing to be closed automatically. The product adopts a miniature circuit breaker with the short circuit overload protection as the main switch, which is equipped with an ultra-small intelligent electric operating mechanism featuring a microprocessor. It controls the on/off state of the circuit breaker automatically through detection of the control signal, providing automatic control, on/off state feedback and other functions of the circuit breaker.


  • Shell frame level: 125A
  • Tripping characteristics: Type C
  • Rated current: 40A, 50A, 63A, 80A, 100A, 125A
  • Number of Poles: 2P, 4P
  • M: Electric-operation handle sealed None: Electric-operation handle Exposed
  • Wiring mode: 2P single phase; 4P three-phase four-wire system
  • Rated operational voltage(V): AC 230/AC 240; AC400/AC415
  • Rated current(A): 40A, 50A, 63A, 80A, 100A, 125A
  • Control loop power voltage(V): 220VAC/50HZ
  • Rated insulation voltage(V): 500
  • Power-on delay t: 8s≤t≤7s
  • Remote automatic closing time: ≥3s
  • Remote automatic opening time: ≥2s
  • Mechanical life(times): 10000
  • Electronical life(times): 6000
  • Rated impulse withstand voltage: 6KV
  • Pollution level: 2
  • Degree protection: IP20
  • Working environment(℃): -40~+70

3.Working Condition:

  • Ambient temperature:-40℃~+70℃
  • Relative air humidity:≥95%
  • Altitude:≥2000m
  • The product is applicable in an environment with pollution class ll
  • Working site without obvious vibration and shock
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