ASC-410 series digital capacitor protection and monitoring device suitable for medium and low voltage shunt compensation capacitor bank, the capacitor unit interval layer devices. ASC-410 series two, ASC-411 and ASC-412. ASC-411 voltage protection taken from the busbar PT taken from the busbar PT; ASC-412 low voltage protection, over-voltage protection taken from discharging the PT. Main functions: a) three-stage over-current protection; b) zero sequence overcurrent protection function; c) zero sequence overvoltage protection; d) overvoltage protection (can cast no flow blocking function); e) low-voltage protection function flow blocking function (can vote). f) event logging, fault recording