What is the difference between off load and on load changeover switch?
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ON Load Changeover : On load changeover is the one which changes the load from one source of supply to the other source of supply while the load is connected which means that load will immediately draw current as soon as it is connected to other source.
OFF Load Changeover : This is the type of changeover in which the time delay is provided with the help of unit so that after changeover between supplies load is connected to other source of supply after a particular time delay. This is better preferred method as it avoids surges or sparking which can occur due to sudden connection of load after changeover.