TSD series fully automaicaly voltage regulator consist of contact auto transformer, servo motor, automatic control circuit etc.When gridvoltage instability or load change , automatically sampling control circuit sends a signal to drive servo motor, adiust the positlion of the selcoupling voltage regulator for carbon brush, make the output voltage rating reach the stable state.This product has the waveform distortionless, reliable performance, long-term operation and other characteristics, has time delay,overvoltage, undervoltage protected function. t can be widely used in electricity which need stable voltage, itis a kind of ideal voltage stabilizedsupply.Ensure that your normal operation of electrical equipment.