Consumer Reports explains how a transfer switch or interlock device works, so your portable generator is ready for the next storm.

Portable generators rated for 5,000 watts and above can connect to your home’s circuit breaker panel with a transfer switch—a small board that looks a bit like a circuit breaker panel itself.

A transfer switch allows a portable generator to supply power directly to key circuits, keeping important systems running without manual rewiring.

A transfer switch is like a mini circuit breaker panel that allows you to draw electricity from your generator instead of from the power company.

From picking the right panels to the right type of installation, we walk you through every step of the process.

If you have a mid-sized or larger portable generator rated for 5,000 watts or more, you can connect it to your home’s circuit breaker panel with a transfer switch—a small board that looks a ...