Single-Phase Relay Type Automatic Voltage Stabilizer is ideal for protecting electronic and electrical equipment like televisions, music systems, refrigerators, air-conditioners, water coolers, and deep freezers etc. Opto Instruments Pvt. Ltd manufactures Single-Phase Relay Type Automatic Voltage Stabilizer. Opto Instruments Pvt. Ltd supplies different types of servo controlled voltage stabilizers, automatic voltage stabilizers, Constant voltage transformers, isolation transformer, inverters, UPS systems etc. Single-Phase Relay Type Automatic Voltage Stabilizer is available in various models, corrects the voltage before it reaches the equipment and stabilizer steps up as soon as voltage drops and steps down to normal levels immediately when voltage rises.