Tuesday, 26 May 2020

What is Relay - how does Relay work and types of Relay ?

What Is Relay 

What Is Relay ?


 Definition Of Relay : A device that turns on or off the supply of 1 circuit with the help of electricity is called relay. A relay is an electric switch. Which can turn on or off the supply of any circuit. Our homes have common switches that we can manually press to turn our home appliance on or off. But to use the relay we have to supply the relay. Only then does she do her work. Wherever switching is done such as inverter stabilizer etc. relay is definitely used. Because without relay we cannot do switching and in such equipment we need switching the most.

Why Relay Important !

If you make electronic circuits, you will see relays in one of the circuits and the work of the relay is the same in every circuit or outside the circuit that it will do the work of switching. Many people do not know about railways what relay is, how it works and where it is used. That is why today in this post we are going to give you all the information related to you.

What happens in relay ?


A relay is a very fast switching device. Inside which different components are inserted but not everyone knows what components are in a relay and what they do, the list is given below which are the components in a relay. Are.

Relay Working


  1. Armature: It connects the Common Terminal with NC Contact and NO Contact.
  2. Spring: It connects Armature to NC Contact when the relay is off. Or let's say Spring pulls the armature and connects it to the NC Contact.
  3. Yoke: It is the outer part of the coil.
  4. Contact: This is the terminal of the relay where we can connect the device or circuit to whatever we need to switch.
  5. Coil: It connects the Armature to NO Contact.

How relay works ?


The way the relay works is very simple. The relay consists mainly of a coil. Which converts the NC contact in it to NO. You can easily understand this from the photo below.

Relay Working


Relay Working ? The relay requires power to work. As you can see in the photo above, when the relay is OFF, the Common Terminal is directly connected to the NC Contact. If you give a supply to the Common Terminal, it will go directly to the NC Contact. But as soon as we supply the coil of the relay. So this coil will be activated and the armature will be pulled towards it so that the Common Terminal will now move from NC Contact to NO Contact and the supply will come to Normally Open Terminal. But as soon as you turn off the supply of the relay, the Spring will pull the Armature back to its side and reconnect to the Common Terminal NC Contact.

So this is how the relay works. The way it works is very easy and simple. If you do not understand this method, you must comment below.

Type Of Relay 


There are many types of relays, the size of which depends on how they are used. The type of relay depends on its use. Where the type of relay is required. If the same type of relay is used there then below you are given a list and what are the types for it.

  • Based on working principle


There are two types of relays based on working principle: 
  1. electromagnetic relays 
  2. semiconductor based relays. 
Of these, electromagnetic relays are quite large and are used in inverter stabilizers etc. The same semiconductor based relays are very small and are used in short circuits.

  •  According to the number of poles


We can only take a connection in the photo above with NO and NC contact. But if we need more than one terminal somewhere or we need more than one switching, we have to use two or more pole relays instead of one pole. In which we can turn on or off more than one circuit or device at a time.

  1. Single Pole Single Throw Normally-Open
  2. Single Pole Single Throw Normally-Close
  3. Single Pole Double Throw
  4. Double Pole Single Throw
  5. Double Pole Double Throw

Suppose you have two water pumps in your house and you want your water tank to be filled with the first water pump then the second water pump starts automatically then you will need a single pole double throw relay.
In Single Pole Double Throw relay you will find 1 NC and 1 NO terminals then you have to connect the first Water Pump to the NC Terminal first and the second Water Pump to the NO Terminal. So as soon as the first water tank is filled then your relay will be activated then NC contact will automatically become NO and NO contact will become NC and supply will start in the second water pump. So this is how you can use Single Pole Double Throw relay.

  • According to Volt


Depending on the volt or so to speak the size in the market you will find relays running on different bolts that will run from 5 V DC, 12 V DC, or 24 V DC and 110V AC, or 220 V AC Will run from

Apart from all these, there are many types of relays. Which are based on their size and texture such as: 

    1. Mercury Relay
    2. Overload Protection Relay
    3. Latching Relay
    4. Vacuum Relays
    5. Force-Guided Contacts Relay
    6. Multi-Voltage Relays
    7. Time Delay Relay
    8. Mercury-Wetted Relay
    9. Safety Relays
    10. Coaxial Relay
    11. Solid-State Relay
    12. Static Relay
    13. Contactor
    14. Solid-State Contactor
    15. Reed Relay
    16. Polarized Relay
    17. Machine Tool Relay
So in today’s post we have tried to give you complete information related to what does relay work, Types Of relay, Working Of relay etc. If you want to know anything else then comment below and if you find this information useful Be sure to share it with others..

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