There are components that appear, perform their duties for a while, then disappear and are replaced by equivalent components completely different. In the case of the relay, it did not. The relays just switched technology, through electromechanical version for the solid state, but its basic function remains the same today. See this article, as it evolved and how their brands have taken different forms according to applications.
Newton C. Braga
For many, the relay is considered a component overcome, but this is not true. The basic function of controlling a circuit from a signal via a switch controlled by voltage or current, it still requires a multitude of applications. It is clear that the relay in its traditional form can, in many cases be replaced by solid state versions, but this is not a rule. The important thing to remember is that, despite everything, he is still an indispensable component.
It is for this reason that concerned about it, the manufacturers of these components have been improving, creating ever more efficient components, whether electromechanical, whether solid state.
Types
Today we rely primarily on two types of relays. The first is the traditional electromechanical relay, consisting of a coil where it is applied the control signal and a set of contacts that controls the external circuit, as shown in Figure 1.
This type of relay has the advantage of completely isolating the control circuit of the controlled system and also address current in both directions, or perform complex switching functions.
The disadvantage is in the operating speed (slow), noise and fire arcs produced when the contacts and reliability (low) because it is an electromechanical system.
Of course, many electromechanical relays are still used very elaborate designs that improve their performance in relation to ancient types. The use of magnets in conjunction with the coil in order to polarize the magnetic circuit, thereby increasing the sensitivity and speed of response, is an example of resources that we find in modern electromechanical relays.
The second type of relay is the Photo MOS, mainly composed of an infrared LED emitter and a photosensor system that controls one or more field effect transistors power (Power MOS), as shown in Figure 2.
http://www.mecatronicaatual.com.br/secoes/leitura/697
The management and control of complex processes of modern industry require sophisticated tools for real-time management of several integrated processes (like production planning, process control, safety, clean production, among others). This complex integration incorporates other types of knowledge that add to the handling of software tools. Most notable among these is the domain of manufacturing processes, management systems, information systems (databases included), mechanical, electrical and electronics technology, sensors and actuators, and computer networks. The integrated area of these diverse technologies is what you might call Mechatronic Systems. Or, more formally accepts a definition: "the synergistic integration of precision mechanical engineering with electronics and intelligent computer control in order to design processes and manufacturing." This definition is virtually coincident with that taken by the Advisory Committee for Industrial Research and Development of the European Community (IRDAC): Mechatronics is the synergistic integration of mechanical engineering with electronics and intelligent computer control in the design and manufacture of products and processes. Mechatronics, then, is an integrative discipline that uses the technologies of mechanics, electronics and information technology to provide products, systems and processes improved.
http://www.mecatronica.ufba.br/oquee.html
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