Auto Transformer is an easily operational device due to its compact size and light weight. This electrically driven device is widely being applicative in power applications for interconnecting systems, which are operated at distinctive voltages. It is also being used as voltage regulators in rural areas, so that people living far from the main power source can also receive same average voltage. Offered Auto Transformer is a kind of electrical transformer, which is available with only one winding instead of two. This single winding found in this transformer has minimum three taps, where all the electrical connections are made. This grade of electrical device is widely appreciated for offering lower leakage reactance along with lower excitation current and lower power losses.