... ) out 3.current displ auto change over switch funtion1.Change over switch applied in rated voltage AC70V-AC300V, 50/ ... 60Hz power supply system. 2.The change over switch input state grid power, Solar power, Wind power, ... power resource. When one kind power failure, it will switch automatically between power supply and backup power supply, to ... C------80°C 3 way,4 way 30A Automatic transfer switching