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