The relay's primary appeal is its ability to do a lesser-switch's bidding but it's capable of so much more. Relays can be wired together to create very useful, simple, and utterly reliable networks.

An electrical relay is a type of heavy-duty, remote-control switch able to handle high-current accessories, yet capable of being actuated by substantially less current. Relays install between the ...

Shelly’s Gen4 relays start at $18 and can automate anything that’s wired, from light switches and garage door openers to sprinkler systems and appliances. Designed to fit inside electrical boxes, ...