Relay,Principle of relay,NO and NC relay, use of relay, difference between Contactor and Relay,Classification of Relay
Principle Relays are switches that open and close circuits electromechanically or electronically. Relay control one electrical circuit by opening and closing contacts in another circuit. Normally open and Normally closed When a relay is normally open (NO) there is an open contact when a relay is not energized .When a relay is normally closed (NC) there is a closed contact when the relay is not energized. The state of relay will change when we apply the electrical current to the contact. Uses of Relay Relays are generally used to switch smaller current in a control circuit and do not usually control power consuming dev...