What is Relay ? How it work?

  Relay  Relays are used in many different contexts, including home automation, autos (cars, motorcycles), industrial applications, do-it-yo...

 

Relay 

Relays are used in many different contexts, including home automation, autos (cars, motorcycles), industrial applications, do-it-yourself projects, test and measurement equipment, and many more. What, then, is Relay? How a Relay Functions What are some uses for relays? In this guide, let's learn more about relays.

What is a Relay?

Relays are straightforward electromechanical switches. Relays are switches that link or disconnect two circuits, similar to how regular switches are used to manually close or open circuits. However, a relay employs an electrical signal to control an electromagnet, which in turn connects or disconnects another circuit, as opposed to a human process.

Relays come in a variety of forms, including electromechanical and solid state. Relays with an electromechanical design are widely utilised. Before learning how this relay operates, let's examine its interior. Although there were many different types of relays, they all functioned the same.

Each and every electromechanical relay comprises of an.

1. Electromagnet
2. Contact that is moveable mechanically
3. Spring and switching points
4. A copper coil coiled around a metal core creates an electromagnet. As indicated, the coil's two ends are attached to the relay's two pins. These two serve as pins for a DC supply.

To connect a high amperage load, two additional contacts, referred to as switching points, are typically present. In order to connect the switching points, a further contact known as the common contact is present.

Normal open (NO), normally closed (NC), and common (COM) contacts are the names given to these contacts.

A relay can be used in both an AC and a DC circuit. In the case of AC relays, the relay coil demagnetizes at each current zero position, increasing the likelihood that the circuit will continue to be broken.

How a Relay Functions work. 

The relay's operation is sped up in the animation that follows.

Relay working 

The electromagnetic induction theory underlies relay operation.

An electromagnetic field is created around an electromagnet when some current is delivered to it.

The relay is operational in the above image. DC current is applied to the load using a switch.

The iron core and copper coil in the relay function as an electromagnet.

The coil begins to attract the contact as soon as DC current is supplied, as indicated. This process is known as relay energising.

The supply returns to its original place when it is removed. De energising of relay is what this is known as.