DW17 (ME) series intelligent universal circuit breaker (hereinafter referred to as circuit breaker), is suitable for distribution network of rated working voltage AC 380, 660V, 50Hz, to distribute energy and transfer circuit infrequently, protect circuit and electrical equipment against over load, under voltage and short circuit, furthermore, it has grade selection protection, also can start the motor directly and protect it. The product is in line with standards GB14048.2 and IEC60947-2.