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Relay Electrically Operated Switch Working Principle

A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals.

source/image(PrtSc): The Engineering Mindset

How relays work. In this video we look at how relays work, what are relays used for, different types of relay, double pole, single pole, phototransistor, solid state relay, semiconductor, flywheel diodes, 8.Watch the video from The Engineering Mindset for more info:

Suppressor diodes, DPDT, Double Pole, Double Throw Relay, Double throw relay, single throw relay, latching relay, nc, normally closed relay, no, normally open relay, Electromagnetic, electromechanical relay.


In a normally open relay, power flows through an input circuit, activating an electromagnet. This generates a magnetic field that attracts a contact to join with the second, larger circuit, allowing current to flow through.These parts are safely held with the help of a spring.The spring is used so as to produce an air gap in the circuit when the relay becomes de-energized./The Engineering Mindset