Site hosted by Angelfire.com: Build your free website today!

Hello viewers’ in this article I am going to tell you about overload relay. As its name is overload, means that it will operate at overload condition.

 

What is overload relay?


Overload relay is relay which operates at overload condition called overload relay. As we know that relay is a fault sensing device which sense the fault and trip the circuit breaker. Overload relay used to protect motor at overload. Overload relay connect to contactor and when overload condition arrived it gets operate.

 

Construction


Following figure is showing parts of overload relay…


 

1.      Screw head for adjustable shield

2.      Motor circuit terminals

3.      Control circuit terminals

4.      Terminal arrangement

5.      Mounting plate

6.      Dashpot

7.      Name plate

8.      Coil


Working


As I told you it’s operate at overload condition so when overload condition occur it gets operate. Its terminal connects to contactor and other connects to induction motor which has 415v. In this relay when we got overload condition then current flow in coil due to overload condition it have plunger which connect to dashpot. Due to this plunger open the contact and after pushing reset button after push reset button it gets operate again.

How to operate

It has following buttons…

1.      Start

2.      Stop

3.      Current setting

4.      Reset button

As the name mention start and stop button when we push start button it will operate and after pushing stop button it will be stop. There is another button name is current setting means that we set current value. For example let suppose we set current value as 4 Amp it will be set at 4 amp means current will take 4 amps by motor if motor take current more then it then motor will be trip. An overload current condition achieve due to overload means that motor is taking more current due to overload.

 

Use of an overload relay

It uses to protect motor due to overload condition.

 

Advantage


With the use of it will protect motor otherwise motor will burn due to overload condition.

 

Overload relay is relay which operates at overload condition. It have current setting button with the use of it we can select current value taken by motor and if motor will take more current to setting value it will trip due to fault condition.

 

This is about help people online on specific topic like blogging, seo, link building and many more.