WRM2E series molded case circuit breaker is suitable for AC 50Hz, rated insulation voltage 800V, rated working voltage 690V and below, setting current 16A to 800A circuit, used to distribute electric energy, under normal conditions for infrequent closure and disconnection, and in the line and equipment overload, short circuit and undervoltage to play a protective role. The circuit breaker with rated current of 400A and below can also be used for infrequent starting, breaking during operation and protecting the motor when it is overloaded, short-circuited and under-voltage.