TDGC,TSGC contact voltage regualtor, variable transformer (Variac) 1.Phase no.: 1/3 phase 2.Input ... voltage: 1P 220V, 3P 380V TDGC,TSGC contact voltage regualtor, variable transformer (Variac)Feautreis series energy-saving voltage regulator are made ... 90 degree.(use semiconductor thermometer method measure) TDGC,TSGC Dimmerstat, variable transformer (Variac)