automatic transfer switch is a PC class infrequent change-over switch,with two- station design (commonly used for A and standby for B), suitable for AC systems with AC 50-60hz and rated current 6A-63A. The main function of the automatic transfer switch is when the main power (common power supply A) fails, the ATS will automatically switch to the backup power (Backup powersupply B) to continue working (switching speed <50 miliseconds), which can effectively solve the troubles caused by power outages.