... to control "Auto" , "Off" ,"Manual"or small .auto control: use RTOS embedded Microchip to auto control when the loading big LED display and firmware control, 3 ... savingRTOS embedded firmware control Switchwith "Auto""Off""Manual" choiceUseful Load: 200ampApplications:Shop, House, Restaurant,Office ,Factory,Cyber-cafe,etc.. 200 AMP three phase ...