... inductance coil for disconnected, and the produced overvoltage main circuit and control circuit, removing arc, over-voltage, maximum eliminate emi, prolong life ... ±10 510±10% 6303.Keywords DM series generally parallel in both ends of the DC circuit,such as DC contactor, relay coil ... that occasion other circuits are disturbed.At this time,DM series are used to eliminate all impacts to the power supply ...