SDM6 series moulded case circuit breaker is one of new type breaker which this company adopts international advanced design, manufacture technology to develop, whose contact and arc suppression system adopt revolving double cut-off point design so to improve breaking capability, and whose tripper have thermomagnetic trip and electric trip, the products have reached advanced international level. The rated insulating voltage is 950V. Sui-table for AC 50Hz(60Hz). Rated working voltage 690v or below, rated working current is 12.5 to 630A of circuit. and use in distributing electric energy. Non-frequent making and breaking in the normal conditions and protecting when circuit and installation are overload. Short circuit and lacking Voltage. Rated shellrack and the breaker which current is under 400A,take protect effect when mousecage motor＇s nonfrequent start, breaking off working and protecting overload, short circuit and lacking voltage.