ASZ-411 sub-standby power source device after disconnection of the the working power failure or other reasons, automatically disconnect power, the segment circuit breaker is closed, completed BZT function. Main functions: a) standby power is automatically put into function; b) composite voltage start-up overcurrent protection; c) charging protection function; d) Overload protection; e) PT wire-break monitoring function; f) event logging, fault recorder ; g) of CAN data communication capabilities.