A changeover switch is designed to transfer a house (or business) electricity from the commercial power grid to a local generator when an outage occurs. Also known as "transfer switches", they connect directly to the generator (or alternative power source), commercial power supply or line, and the house. 

• Disconnect power from source before installing, modifying or service
• All strands of the cable shall go into the terminal o each phase with required torque.
• Load line termination should be as per the markings provided on the MCB/Isolator
• In critical case of contact welding the front toggle does not indicate the Off position. 
• Not to be pushed forcefully down