TND/svc series fuly automatically voltage regulator consist of contact auto transformer, servo motor, automatic control circuit etcWhen grid voltage instability or load change , automatically sampling control circuit sends a signal to drive servo motor, adjust theposition of the self coupling 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,over voltage,undervoltage protected function. it can be widely used in electricity which need stable voltage, it is a kind of idealvoltage stabilized supply. Ensure that your normal operation of electrical equipment