WITQ1 series intelligent dual power automatic switch is suitable for ac 50Hz,rated voltage 400v,from 6A-630A dual power supply system. This product has overload, short circuit,under voltage and phase failure protection function,when the power failure occurs,it can automaticaly finish the commonly used between power supply and backup power swit chall the way,in order to protect the important user power supply reliability. The products are widely used in hospitals,shopping malls, Banks,chemical industry,metallurgy,high-rise buildings and military facilities,which do not allow to black out,as an important electrical equipment to ensure continuous power supply.Products comply with GB/T14048.11 standards