INTRODUCTION;
This article is all about what is Relay and how it works? we had also mentioned to the point information about Relay type “Electromechanical Relay”. Before going forward carefully learn what is relay. As we know that this age is the age of invention and knowledge. when new electronics are invented, some other electronic devices are also designed for safety measures. so Relay is also one of them. after understanding and reading carefully you will be able to understand ” what is a relay and how it works”?
What is a Relay?
TYPES:
There are different types of Relays that can be used according to the situation. Some of these types are; Electromechanical and Solid-state. There are many other types but all have the same function.
1: ELECTROMECHANICAL RELAY;
It is an electrical device that works on the basis of electromagnetism to automatically control the switching mechanism. This relay is used to control high-power electrical machines.
Nowadays mostly electrical machines use an electromechanical relay to control low signals and also controls multiple circuits by only 1signal.
APPLICATIONS:
Some of the Electromagnetic applications are the following; the general aviation, aerospace, and wireless technology industries, and there are a lot more devices based on electromechanical relays. This type of relay consists of the following elements;
- Electromagnet.
- Mechanically movable contact.
- Switching points.
- Spring.
ELEMENTS OF ELECTROMECHANICAL RELAY;
The explanation is based on the image given above as all components are present but need little-bit explanations that are given below:
1: Electromagnet;
Before moving forward know about the construction of the Electromagnetic component. This component is constructed by binding a copper coil on a metal core. Then its ends are attached to the relay and these pins work as DC supply pins.
OTHER ELEMENTS:
The other elements such as Mechanical Moveable contact and Switching point are explained together as their work depends on one another.
So There are commonly two more contacts. One is known as Switching points and their function is to control high load Ampere and the other known as Common contact and its function is to attach the switch points.
ELECTROMECHANICAL POLES NAME;
ELECTROMECHANICAL OPERATING:
Working ;
- Its main working principle is based on Electromagnetic waves.
- When Electromagnetic waves are supplied alongside some current then it brings out a magnetic field in its surroundings.
- The Electromagnetic function brings out by the Copper coil and Iron core in Relay.
- If the DC current is supplied to the coil it starts attaching as shown in the image. This is known as energizing of the relay.
- If the current is removed then it moves back to its original position and this state is known as De- energizing.
- There are also relays totally opposite to the above-mentioned relays such as solid-state relays are having sensors that detect the input voltage and control the output using Opto- coupling.
Working principle of Relay
It operates on the principle of electromagnetic attraction. When the circuit of the relay senses the error in the circuit, it energizes the electromagnetic field which generates the temporary magnetic field.
This magnetic field influences the relay armature for availability or closing the contacts. The small power relay becomes only one contact, including the high power has two contacts for opening the switch.
The inner section of the relay is shown in the figure subsequently. It has an iron core which is wound by a control coil. The power supply is given to the coil within the contacts of the load and the control switch. The current flows over the coil produce a magnetic field throughout it.
Due to this magnetic field, the overhead arm of the magnet attracts the lower arm. Therefore close the circuit, which makes the current flow through the load. If the contact is already closed, suddenly it moves opposed and hence opens the contacts.
Relay Contact Types
Poles and Throws
- Single pole single throw
- single pole double throw
- double pole single throw
- double pole double throw
Single Pole Single Throw
Single Pole Double Throw
Double pole single throw
Double pole double throw
NOTE:
Relay Applications
- stems.
- Telecommunication.
- Industrial process controllers.
- Traffic control.
- The motor drives control.
- Protection systems of the electrical power system.
- Computer interfaces.
- Automotive.
- Home appliances.
