Diagram Of Relay. 85 and 86 are the coil pins while 30 87 and 87a are the contact pins. The transistor allows the hc11 to control the medium sized coil current of relay.
Relay explained and animateda relay is an electrically operated switch. A control circuit shown in green and a load circuit shown in red. The term static implies that the relay has no moving mechanical parts in it.
In relay logic circuits the contacts no and nc are used to indicate normally open or normally close relay circuit.
To understand simply it is like a brain in our human body when the brain gives the sense the body parts are operate to do any work. The following simplified circuit diagram is often used to easily understand how a relay operates. Compared to the electromechanical relay the solid static relay has longer life span decreased noise when operates and faster respond speed. A control circuit shown in green and a load circuit shown in red.