AC Electronic Servo Controlled Voltage Stabilizer has good efficiency and the feature of fast correction. The Stabilizer has the feature of high stability with no over shooting and low internal impendence. The Stabilizer has plug in control circuit board for instant service and no down time and has voltmeter to indicate input/ output voltage with selector switch. The AC Electronic Servo Controlled Voltage Stabilizer has optional under voltage/ over voltage cut out and alarm lamp, line noise RF filter, surge supressor and MCB protection for short circuits and over load.