ATO automatic voltage stabilizers including 1-phase and 3-phase versions, they are widely used in: Industrial and mining enterprises, oil fields, railways, construction sites, schools, hospitals, post and telecommunications, hotel, scientific research departments such as computer, precision machine tools, computer tomography (CT) of photography, precision instruments, test equipment, elevators, lighting, imported equipment and production lines and other places of need stable power supply voltage. A voltage stabilizer is a device for stabilizing the output voltage. The stabilizer is composed of stable voltage and constant voltage circuit, control circuit and servo motor. When the input voltage or load changes, the control circuit samples, compares and amplifies, and then drives the servo motor to rotate to change the position of the voltage regulator's carbon brush. By automatically adjusting the coil turns ratio, the output voltage is kept stable.