... display and firmware control, Three phase energy saver, power saver, electric power saver, power saver, for industry, for Motor, for electromotor Three ... Microchip to auto control when the loading big or small. Switch: With swith to control "Auto", "Off", "Manual" Work Status ... Load: 400AMP Suitable temperature range: -50~+60 Method of Power compensation: Automatic Three Pase LED display Power Saving