We observe that, generally AC voltage main supply is never 230 Volt or 415Volt, but in reality it varies from 150 Volt to 300 volt and 300 Volt to 500 Volt for single and three phase respectively. It’s a very common phenomenon, in India as well as most of the developing countries. The difficulties caused by them are well known, Such as Over Load Condition, Line Losses, Poor Power Facors etc. Generally constant voltage which is required by load is never constant, but is fluctuating in nature. To overcome this a servo stabilizer is employed.