Kats2e (terminal) dual power automatic transfer switch (hereinafter referred to as transfer switch) is applicable to dual power supply system with AC 50Hz and rated working voltage of 400V and below. It can complete the conversion between common power supply and standby power supply by automatic or manual operation. The transfer switch is mainly used in hospitals, shops, banks, chemical industry, metallurgy, high-rise buildings, military facilities and other important occasions where power failure is not allowed.