Industrial Grade Automatic Voltage Regulator can be set and operated in the manual mode when desired even without the control circuit. The Regulator has the feature that output voltage may be set by means of a panel control within a range of about 25 v and this however shifts the input voltage range correspondingly. The Regulator has the feature of no waveform distortion, low internal impedance, wide frequency range and fast correction rate. The Industrial Grade Automatic Voltage Regulator has auto/ manual operation facility, over voltage and under voltage alarms and output voltage adjustability.