HomeProductsEnergy monitoring and protectionASCB Series Smart Circuit BreakersASCB2-125J Series Smart Circuit Breaker

ASCB2-125J Series Smart Circuit Breaker

The Smart MCB series ASCB2-125J is designed for low-voltage power distribution systems in buildings and covers related areas such as industrial, commercial, and residential buildings, as well as infrastructure. The Smart MCB is equipped with RS485 communication capabilities. When connected to receivers, it can monitor key electrical parameters of circuits via software platforms, including voltage, current, power, temperature, leakage current, and energy consumption. It also integrates functions such as remote control, early fault warning, fault triggering, and current measurement.

  • Frame size: Max. 125 A
  • Nominal voltage: 230V (1P/2P), 400V (3P/4P)
  • Rated current: 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A
  • Nominal short-circuit breaking capacity: 10kA
  • Mechanical load capacity: 20000
  • Electrical load capacity: 10000
  • IP protection rating: IP20

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Product info

Product modelfunctional description
ASCB2-125JIt monitors real-time parameters such as voltage, current, power, electrical energy, and temperature. It features a variety of protection functions, including overvoltage, undervoltage, overload, short-circuit, overcurrent, and overtemperature protection. It supports various control modes: manual operation, electrical control, interlock, remote control, and timer control. DIN rail mounting is possible, and the device is available in 1-, 2-, 3-, and 4-pole versions. RS-485 (MODBUS) communication is integrated as standard, and Type C/D tripping characteristics are available as an option.
ASCB2LE-125JIt monitors real-time parameters such as voltage, current, power, electrical energy, temperature, and fault current. It integrates a variety of protection functions: overvoltage, undervoltage, overload, short-circuit, overcurrent, overtemperature, and earth fault protection. It supports various control modes: local manual toggle switch operation, local electrical control, local interlock, remote control, and timer control. It is designed for DIN rail mounting and is available in 2-pole (2P) and 4-pole (4P) versions. RS-485 (MODBUS) communication is standard; Type C/Type D tripping characteristics are optional.

Technical data

Product types

ASCB2-125J

 ASCB2LE-125J

Poles

1P/2P/3P/4P

2P/4P
Frame size 125 A
nominal voltage 230V (1P/2P), 400V (3P/4P)
Rated current 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A
Type of immediate trigger

CD
Nominal short-circuit breaking capacity 10kA
Protective functions Short-circuit protection Type C: Trips within 0.04 s at 5 to 10 times the rated current, Type D: Trips within 0.04 s at 10 to 14 times the rated current
Overcurrent protection The early warning is triggered by default at 80 % of the rated current, the actual trip occurs at 110 % of the rated current; the threshold is adjustable.
Overvoltage protection Overvoltage warning at 245 V and tripping at 260 V are standard; thresholds are adjustable.
Undervoltage protection Undervoltage warning at 190 V and shutdown by default at 175 V; thresholds are adjustable.
Overtemperature protection By default, an over-temperature warning is issued at 80°C and the device shuts down at 95°C; the thresholds are adjustable.
Residual current protection No one Fault current warning at 15 mA and tripping at 30 mA by default; thresholds are adjustable.
Overload protection The power alarm is triggered at 1 kW by default, threshold adjustable; this circuit breaker is deactivated by default.
Residual current self-test No one Local button/remote control self-test
Mechanical load capacity 20000
Electrical load capacity 10000
IP protection class IP20
Terminal capacity ABCN cabling: 1–35 mm²
RS485 cabling: 1.5 mm²
Operating altitude ≤2000 m
Ambient temperature -10℃～55℃, 24-hour average temperature ≤40℃
Environmental conditions No potentially explosive atmospheres, no conductive dust. The ambient air must not contain substances that corrode metals or damage insulation, and there must be no significant vibrations.
Relative humidity 50 % relative humidity at 40 °C, higher relative humidity permissible at lower temperatures.
Storage temperature -20℃-70℃
Mounting type Standard 35 mm rail mounting

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