Automatic voltage regulator
500w-3000 watt two way step up down voltage transformer with built-in voltage regulator/stabilizer. Converts 110/120 volt to 220/240 v and 220 volt to 110/120 volt
it can regulate big range fluctuating input voltage from ac 75v-130v or 180v-260v to output voltage: ac 110v+-3% or ac220v+-3%
It works with only single phase 220 volt power