VKQ31E Series of mouth switch (intelligent) (hereinafter referred to as ATSE) is one of the automatic switch devices developed by our company with advanced design and manufacturing technology. ATSE is mainly composed of two VKB65 high breaking miniature circuit breaker, motor drive mechanism and intelligent controller. It is suitable for AC 50Hz, rated voltage 230V / 400V, rated current 6 ~ 63A dual power supply system, which can protect the overload and short circuit of the electrical circuit, and complete the infrequent automatic conversion function for the overvoltage, undervoltage, phase loss, power failure, etc. in the dual power supply system, so as to ensure the reliability and safety of power supply for important users.