Relay:  relay is a switching device as it works to isolate or change the state of an electric circuit from one state to another. Different Types of Relays. Classification or the types of relays depend on the function for which they are used.


A relay is an electrically operated switch. Many relays use an electromagnet to mechanically operate a switch, but other operating principles are also used, such as solid-state relays.

What is the function of the relay?

Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.

What is Relay used for?

A useful property of relays is that the circuit powering the coil is completely separate from the circuit switched on by the relay. For this reason relays are used where a safe low-voltage circuit controls a high-voltage circuit.

What's the difference between a relay and a contactor?

 Relaysand Contactors are electromagnetic switches. The only difference is that relaysare usually used for low voltage applications while contactors are used for higher voltage application. Contactors usually have Overload protection.

What are the different types of relays?

Different Types of Relays
  • Electromagnetic Relays. These relays are constructed with electrical, mechanical and magnetic components, and have operating coil and mechanical contacts. ...
  • Solid State Relays. Solid State uses solid state components to perform the switching operation without moving any parts. ...
  • Hybrid Relay. ...
  • Thermal Relay. ...
  • Reed Relay
Relay Relay Reviewed by Altron Automation on February 07, 2019 Rating: 5

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