Quick Answer: What Is The Function Of Relay?

What is the use of relay?

Machine tool relay A relay allows circuits to be switched by electrical equipment: for example, a timer circuit with a relay could switch power at a preset time.

For many years relays were the standard method of controlling industrial electronic systems..

What is the advantage of relay?

The advantage of relays is that it takes a relatively small amount of power to operate the relay coil, but the relay itself can be used to control motors, heaters, lamps or AC circuits which themselves can draw a lot more electrical power.

What is Relay and its application?

Relays are used in a wide variety of applications throughout industry, such as in telephone exchanges, digital computers and automation systems. … All relays contain a sensing unit, the electric coil, which is powered by AC or DC current.

What is the meaning of relay?

: the act of passing something from one person or device to another also : a system for doing this. : a group of people, horses, etc., that takes the place of others so that something (such as a job or an activity) is done continuously. See the full definition for relay in the English Language Learners Dictionary.

How do relays work?

Working Principle of Relay It works on the principle of an electromagnetic attraction. When the circuit of the relay senses the fault current, it energises the electromagnetic field which produces the temporary magnetic field. This magnetic field moves the relay armature for opening or closing the connections.

How many types of relays are there?

threeA simple electromagnetic relay is made up of a solenoid, which is wire coiled around a soft iron core, an iron yoke that provides a low reluctance path for magnetic flux, a movable iron frame, and one or more sets of contacts. The three main types of relays are electromechanical, solid-state, and reed.

What is Relay and its types?

Types of Relays. Types of protection relays are mainly based on their characteristic, logic, on actuating parameter and operation mechanism. Based on operation mechanism protection relay can be categorized as electromagnetic relay, static relay and mechanical relay.

Can you relay the message?

to carry forward by or as if by relays: to relay a message. to provide with or replace by fresh relays. Electricity. to retransmit (a signal, message, etc.) by or as if by means of a telegraphic relay.

How do you check a relay?

The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).

What are the two types of relay?

There are different types of polarized relays depends on the magnetic circuit configuration. The two most popular types of these relays include differential and bridge type relays. In differential magnetic system, the difference of two fluxes of permanent magnet acts on the armature.

What are the types of relays?

Relay TypesElectrothermal Relay – When two different material gets in contact, bimetallic strip is formed, and when it is energized, it bends. … Electromechanical Relay – When different mechanical parts are connected on the basis of the electromagnet, contact connection is established.More items…•