... appearance 3>Intelligent AC POWER SUPPLY PANEL:Microcomputer type ac (inverter) power supply panel using dual power switching device communication into ... . When the mains normal, single-phase 220 v ac (or three-phase 380 v) after isolation, rectifier filter to inverter power supply, if the ... process to the equipment and the impact of the power grid.- has a variety of warning method, through the sound, ...