The invention, circa 1835, is usually credited to American scientist Joseph Henry. While relays may seem like holdovers from the days of dinosaurs versus using an optocoupler or solid-state relay (SSR ...

SAN FRANCISCO, CA--(Marketwired - Aug 4, 2015) - A relay is a device designed for use in electrical circuits to register overcurrent, overvoltage, reverse power flow, and over- and under-frequency ...