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