Automatic Voltage Regulator with On / Off Switch is available with -20° C to + 60° C ambient operating temperature. Genex Electric Co. Designs Automatic Voltage Regulator with On / Off Switch. Genex Electric Co. Also develops wide range of voltage regulators with different specifications. Automatic Voltage Regulator with on / Off Switch is provided with parallel operation facility. It is available with fuse protection. It is offered with 6 ohms minimum Field Resistance. The regulator can be provided with external voltage setting facility.