![]() ![]() This construction is extremely useful if you want to control a large current switch with a tiny control signal from a microcontroller (or similar low voltage devices). The beauty of relays is that the parts that acts as switch in the relay (which consists of the actuator and the contacts) are isolated from the mechanism that activates or deactivates the switch (which is the coil and electromagnet). When we remove or disengage the control signal to the coil, it deactivates the electromagnet and the actuator return to its original position. This action will make the actuator to move from one position/contact (this is often called normally close or NC contact) to another position/contact (which is often called normally open or NO contact). When a small control signal flows through the coil of electromagnet, it attracts the actuator. ![]() ![]() In its basic form, a relay consists of an electromagnet and an actuator. The ‘mechanical’ action of moving the switch between ON and OFF positions is achieved by an ‘electrical’ signal. Unlike a traditional switch, which we flip or toggle to make it ON and OFF, a relay is an electromechanical switch. As mentioned earlier, a relay is essentially a switch. ![]()
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