It is a changeover switch used to manually adjust from the main source of supply to the generator or alternate course. At the time of power disturbance, the manual switch can be used to switch on the backup power. In case of issue in the supply of electric supply these switches are used to provide uninterrupted back up power supply. The durability and the reliability of the switches should be considered while selecting the switch. The rating part should not be ignored in selection. There are a couple of edge points in the utilization of manual switches like such type is easily available and maximum usage is done for domestic use. The size of these adjusters are such that they easily fit into available space. Socomec India are the prime manufacturers of generator and single phasechangeover switches.