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Friday, 28 February 2020

Different Types Of Relay

Types Of  Relays



  • Relay is an electrical switch which is used to open or close a circuit with electromagnetic relay or electronically. It operates manually as well as automatically.
  • Relay is used in circuit for protection of electrical circuit, system and electrical equipment. In any electrical system protection of the system is given utmost priority.
  • The purpose of an Electric Power System is to generate and supply electrical energy to consumers. The power system should be designed and managed to deliver this energy to the utilization points with both reliability and economically.
  • Any abnormal operating state of a power system is known is FAULT. And over come this faults the relay gives the protection to the device or system. This faults are of two types 
  1. Short Circuit Fault - Current 
  2. Open Circuit Fault - Voltage


  Types Of Relays


Types Of Relays

Types Of Relay


Classification Of Relay

1. According to the Construction Principle

Depending upon the principle of construction, relay is classified in the following four categories.

  • Electromechanical 
  • Solid State
  • Microprocessor 
  • Numerical

2. According to the Actuating signals

  • Current
  • Voltage
  • Power
  • Frequency
  • Temperature
  • Pressure


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