... insulating voltage is AC800V, ratedworking voltage is AC690V, and below DC250V, and AC 50Hz/60Hz, rated working current is 20A-5000A ... the place where there isn't any explosive medium and conductive dust and no gas, which would corrode metal or destroy ... . With the controller, the setting can transfer between the manual and automatic, and has the every protection function. Make sure the facility safe ...