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Electromagnetic Relay – Its Working And Types

Relays operated using an electromagnetic action are known as electromagnetic relays. The latest Electromagnetic Relays coming up in the market are the ones that are based on microprocessors. Even after the most recent changes, the role of electromagnetic relays is constant. There is still a lot of time till the traditional electromagnetic relay gets replaced by the static relays. Let us try to know more about the different types of electromagnetic relays we have got. There are predominantly three types of electromagnetic relays comparison, magnitude measurement, and ratio measurement. Going by the various working principles of a relay there are further classifications:

  • Attraction armature type relay: Straightforward construction and are used mostly as auxiliary relays. It is used as measuring relay most of the time.
  • Induction cup type relay: It is a disc type relay that is utilized where quick operation along with the polarization effect is required. The number of poles can differ depending on the windings of the relay.
  • Power Relay: It has four pole induction that produces a flux that is proportional to the voltage. It can be designed to create the highest possible amount of torque.
  • Reactance type induction cup relay: It is made by manipulating the coil arrangements for either voltage or current. Pure reactance can be measured by this type of relay.
  • Balanced Beam Relay: It is known as the variant of amateur type relay. However, the field of application of the two is entirely different. These are becoming obsolete day by day.
  • Moving Coil Type Relay: It is a polarized DC coil relay that is extremely sensitive in its operation. It provides accurate measurements in o time.

This was all about various types of electromagnetic relay devices. In transistors and radios, electromagnetic relays have been sued like forever. The main feature about it includes the need of low resistance and its nature to remain isolated from the control signal(physically). There are a few drawbacks of these kinds of relays as well. There are a few big sized relays, and sometimes the coils require a considerable amount of current. Sometimes the operation is slowed due to the switching speed. One has to make sure that the contacts are regularly maintained.

One might ask if a relay is similar to a transistor. Well, the answer is no, though the results required somewhere match, they are not the same thing. Transistors can sometimes perform like a relay. Earlier with the invention of transistors, the concept of television came in to picture. However, relays are used in more number of devices today due to its excellent functionality. An electromagnetic relay can produce a relatively high amount of current even when a low current is passed through it. Therefore it finds a lot of use in alarming devices, safety devices, and other quality control devices. There is much more to explore about this brilliant device. However, the use of microprocessor embedded relays can be a massive breakthrough in the future to come.

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