User Manual

64
Working of Relay
The working principle of relay is simple. When power is supplied to the relay, currents start
flowing through the control coil; as a result, the electromagnet starts energizing. Then the
armature is attracted to the coil, pulling down the mov ing contact together thus connecting
with the normally open contacts. So the circuit with the load is energized. Then breaking the
circuit would a similar case, as the mov ing contact will be pulled up to the normally closed
contacts under the force of the spring. I n this w ay, the switching on and off of the relay can
control the state of a load circuit.
Schematic diagram:
Experimental Procedures
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