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CBC Automatic Voltage Regulator(AVR) is Electromechanical regulators called voltage stabilizers or tap-changers, have also been used to regulate the voltage on AC power distribution lines. These regulators operate by using a servo motor to select the appropriate tap on an autotransformer with multiple taps, or by moving the wiper on a continuously variable auto transfomer. If the output voltage is not in the acceptable range, the servo motor switches the tap, changing the turns ratio of the transformer, to move the secondary voltage into the acceptable region. The CBC Stabilizer provide standard output regulation 220V+/-3% and special 220V+/-1% is available.