A series molded case circuit breaker is a new type of circuit breakers developed by adopting international advanced design, manufacturing technology. It's suitable for infrequently transfer or engine infrequently start-up under such conditions: AC of 50Hz, a voltage less 690V and a rated working current up to 2500A. A series of molded case circuit breaker has protection of overload, short-circuit and under voltage, and can prevent power lines and equipment from damaging. The series of molded case circuit breaker features its compact design, small size, high segment, compact frame, and completed interior and exterior appliances.