It is observed that the voltage at the mains is never constant and is always fluctuating. This fluctuation has a further cascading effect to the equipment s / devices to which the supply is given or to the building where the mains is supplying the electricity. Due to this fluctuation various equipment s /devices fail to operate properly or fail to operate for a long time withoutmaintenance. Also many times the mains voltage is much below or high the desired level of 400 volts.this again results in improper/ malfunctioning of the electric devices operated by this supply. A servo voltage stabilizer ensures proper and constant voltage at all times irrespective of the fluctuation of the main voltage. It also ensures a proper voltage of 400 v even if the mains voltage is below or more than 400 volts.the servo stabilizers are designed with high efficiency and precisions resulting in efficient voltage regulation of all kinds of loads like resistive, inductive or capacitive. They also ensure that the quality of the power is not affected by variations in frequency, power factor or load.