What is Auto Changeover Switch?

Basically you have two sources of power – primary and secondary. Earlier, when the main power supply went off, the operator himself would go and switch on the secondary power supply. This would take time, especially if it is far from a power source. To solve this problem, auto changeover switch was started to be used. As the name suggests, auto changeover switches are used to automatically switch power between primary and secondary sources. If the mains supply shuts down or fails, this switch will automatically connect the load to the secondary power supply. On resumption of mains power supply, this switch will switch the load back to mains power supply. It works in the same way as a relay. Therefore, this automatic switch acts as a very important component to provide instantaneous power supply.

An auto changeover switch has a microprocessor that is programmed to control the switching of the power supply. At one end, it senses the main power supply and as soon as it senses no supply, it switches to a secondary power supply like a diesel generator, UPS or inverter. At the same time, it is continuously sensing the mains power supply, as that is the default connection. As soon as the primary supply is sensed again, it will again switchover to the main supply.