Types Of Relay

Different Types of Relays and their Working Principles

Basically Relay is an open and close contacts, to be find out inside relay circuit, and use relay into different purpose in electrical industry.

This open and close is also called (normally open) and normally close) and inside relay find out one coil. This coil purpose is to make electro magnet in the core when electrical power is applied in the coil, and NC and NO is interchange that means , NC contacts convert NO, and NO contacts convert NC, these conversion is basically called make and break the circuit or on/off the circuit.

Types of relay.

Basic relay  or Electromagnetic

Basic normally relays to be find out in different  on/off contacts that are:


These phenomenon you can also be read in my article in types of switches

Solid State Relay 

consists of solid state components like integrated circuit(IC)

It is accustomed perform change operation with none movement in its elements.

Its power gain is more than the magnetic attraction relays as a result of it needs low power as in input and provides high power at the output.

 Hybrid Relay

 Hybrid Relay is made up of electronic components and electromagnetic relays. Its input part consists of electronic circuitry which performs rectifications tasks. Its output part consist of electromagnetic relay. 

Thermal Relay

works on a very simple principle based on heat effect i.e.

the rise in close temperature changes one position of the contact to a different.

Mostly it is used for the motor protection purposes. It consists of temperature sensors and control elements.

 Reed Relays

Reed Relays consist of a pair of magnetic strips (also called as reed) that is sealed within a glass tube.

This reed acts as each AN armature and a contact blade.

The magnetic flux applied to the coil is wrapped around this tube that produces these reeds move so change operation is performed.

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