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A relay is a component that allows you to control a circuit of high-voltage and high-intensity from a low-voltage circuit. There are several types of relay and different strength.
The principle of an electromechanical relay is a spool of thread, which, with a low voltage, creates a magnet. This magnet becomes so magnetic with a metal plate which makes electrical contact with high voltage.
There are several types of relays. First of all there are different voltages of relay. For example, 5V, 12V, 24V...
In a relay, there may be one or more switch. There are SPST relays, which contain a single switch unipolar
and unidirectional. Are often the the least expensive relay.
There are also relays SPDT. This type of relay is one of the best-known. This is a unipolar, but two-way switch. Much of the time, the relay is equipped with 5 pins. Two of which are used to the coil and the other three for the switch. One of the three is the COM pin which means common. The other is the No. pine which means Normal open and the last is the NC which means Normal connected.
Then, there are relays more complexes that can contain up to 4 switches in the same relay.