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 ...

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 ...

A transformer protection relay does not replace upstream devices. It defines responsibility. By clearly assigning fault detection to the transformer zone, it allows feeders, breakers, and system ...