A relay is a switch controlled by an electrical circuit in which, by means of a coil and an electromagnet or a semiconductor electronic circuit, a set of one or more contacts is activated that allow the opening or closing of other contacts. independent electrical circuits. Frequently the load connected to the output consumes more than the control that excites it or else we want to electrically isolate both parts and it is for this reason that we need these devices called relays. In this way we will have two fundamental types of relays:
Electromechanical : based on an electromagnet that pushes on the contacts, closing or opening them together
From solid state : inside there is a semiconductor electronic circuit and the switching time, as it is not something mechanical, is practically instantaneous, which makes them valid for connecting to coils and other loads that have many consecutive commutations
In this way, in this section you will find connection plates of 1 relay, up to groups or sets of electromechanical or solid state relays of 16 units. Being able to expand to the number that was necessary adding as many plates as needed. In addition, these modules usually have optocouplers to optically isolate the circuit from the load of the control circuit. Sometimes they can be activated with positive logic, negative logic or be configurable