... % Switch : with swith to control "Auto" , "Off" ,"Manual"or small .auto control: use RTOS embedded Microchip to auto control when the loading big ... -400vLED Display , can see the savingRTOS embedded firmware control Switchwith "Auto""Off""Manual" choiceUseful Load: 400 AmpApplications:Shop, House, Restaurant,Office ... ,Factory,Cyber-cafe,etc.. 400AMP Three phase power saver,LED,LCD display