A friend once asked about the block of relays pinned to a board behind my car's dash. To him relays were the mysterious little boxes that some cars inexplicably required to operate a horn. More than ...

Not long after I began contributing to Hagerty eight years ago, I wrote a detailed four-part piece on electrical relays and how they work in cars. You can still find the articles here (Part I: Why We ...

A range of manufacturing and production processes rely on current-operated relays to provide a continuously adjustable trip-current setting. They are able to protect mechanical apparatus from jam-up ...

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, ...

An automotive relay works by using electromagnetism to change small levels of input electricity into larger current outputs. When an electric signal is sent to the relay, electromagnets form or break ...

Relays are electromechanical devices that use a magnetic solenoid to actual a switch. When current is passed through the solenoid coil, it produces a magnetic field. The magnetic field is strengthened ...

Ready-made wiring harness and relay kit makes it easy to add a horn relay to power a set of motorcycle horns. Uses high-quality components. Adding a relay can improve the horn’s output and reduce load ...