Relay Switch Everything You Need To Know

Relay Switches are found in small machines such as microwaves to much bigger traffic lights. These switches are used to make or break the electrical connection. 

The main thing that relays switches is to connect two points however, this can be an understatement. It’s because there are different types of Relay switches and they have different tasks to do. Relay switches usually work electronically or electromechanically.

 Although it has different types all relays work on the same principle when the relay is open it is not energized and as soon as it is closed it gains energy when an electronic supply is provided. 

What is Relay Switch: 

A relay switch is capable of making a connection and breaking it. It is done by the use of the moving part which is controlled by an electromagnet. This movable part is only controlled by an electronic signal. One must know that this is the working principle of an electromechanical relay. 

The relays are used among control panels and building automation to use along the power and switching the circuit control. Other than that, they are used to heat and switch audible alarms, traffic lights, and coils. 

We all have used tv-remotes daily which prevents us from direct contact with electricity similarly, relays help us prevent the same direct contact. It protects us and makes the process much simpler. One can go for EVVR In-wall smart relay switch for better experience.

Types of Relays: 

Relays lie in four different categories. 

  • Electro-thermal Relays 
  • Electromechanical Relays 
  • Solid State Relays 
  • Hybrid Relays 
  • Electro-thermal Relays: 

Electro-thermal Relays let two different materials get in contact. As soon as the bimetallic strip is formed energy is provided to it. The bimetallic strip bends in response to it. Finally, the connection is formed. 

  • Electro-mechanical Relay: 

Electro-mechanical Relay works when mechanical parts are connected and electromagnetic force is applied to them. This causes a connection between them. 

  • Solid-State Relay: 

In this form of a relay, a semi-conductor device is used. It makes a connection and finally, effectiveness, efficiency, and speed are ensured.  

  • Hybrid Relay: 

It is a combination of electromechanical relays and solid-state relays. 

Functions of Relays: 

The relay has an iron core with the control coin. There is a power source that connects the electromagnet with the load contacts and the control switch. 

As soon as the energy is provided through the coil energy is produced and it magnifies. The lower fixed arm of relays is attracted by the upper ones. 

The short circuit is caused as soon as contact is closed. To open the contact opposite movement is performed. Relays can provide both high as well as low-voltage movement.

Arcing is reduced when it comes to high voltage and the circuit noise is reduced when it comes to low voltage. 


Relays are used among everything we have from small to the biggest. Whether it is microwave ovens, tube lights, or big things in the factories. Relays play an important role to make it safe for the electronic circuit to work. Although they work on the same principle’s relays have different types that can lead to different things.