... consists of contact voltage gegulator,sampling control circuit and servo motor. When input voltage or load changes,sampling control circuit ... will sample and amplify the voltage,and the servo motor will rotate in the desired direction,which turns the ... Input voltage160V~250V 70V~130VOutput voltage220±3% with 110V±3%Phase Single phaseFrequency 50Hz/60HzResponse within 1 sec. against 10% input voltage ...