... system Input voltage: Phase voltage: 220V±20%(176~264V) Line voltage: 380V±20%(304~456V)Output voltage: Phase voltage: 220V ... : Non additional waveform distortion Protection functions: Over-voltage,over-current, phase shortage, phase-sequenceand mechanical failure ... used in the place with large electricity demands such as factories, post&Communication, schools, hotel etc. Acted as whole voltage ...