Documents Relay

Relay 1 Relay A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically, but other operating principles are…

Engineering Relay coordination

1.  To determine the ratings and settings of fuses, breakers, relay, etc.  To isolate the fault or overloads. Objective 2. RELAY………  An electrical device,…

Documents em relays

ELECTROMAGNETIC RELAYS RELAY IS AN ELECTRICALLY OPERATED SWITCH. What is a relay ? History of relays The American scientist Joseph Henry invented a relay in 1835 in order…