What Is a Transfer Switch?

Transfer switches safely connect your generator to a circuit panel via a cable and allow you to “switch” between grid power and generator power.

Automatic transfer switches come installed in standby generators and automatically switch between power grid and generator power when they detect a blackout. Manual switches require you to switch over the power at the electrical panel yourself.

Without a transfer switch, portable generators need to run on extension cords, which can be hazardous and difficult to set up. Operating a generator with an extension cord means you can only operate devices running through an electrical outlet, not other units such as overhead lights or sump pumps. If you do run extension cords, you’ll need to ensure they are properly rated for the current they will be carrying.