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Insight - How MCB works

Written By: 

Arpit Jain
 
The following image illustrates the tripping mechanism of the MCB. The circuit breaker contacts and the position of the knob can easily be seen in both, ON and OFF, state. In the ON state the moveable contact touches the fixed contact as shown in the image.
 

Tripping mechanism of MCB

 
The path of the current in the ON state is shown in the image below. The live wire is screwed at the input terminal. From the input terminal the current flows to the fixed contact which is touching the input terminal. The current then moves to the moving contact (since in the ON state it is touching the fixed contact). The moving contact is connected to the electromagnetic coil of the solenoid by means of a thick wire. The current from the moving contacts enters the electromagnetic coil. The current from the coil goes to the bimetallic strip by means of another thick wire and finally to the output terminal where it is collected by the neutral wire of the line.
 

Current Flow

 
 

 

Comments

I likeD it..I had seen it many times at my home but nver tried to know how it works..thanks to engineersgarage ..evrone shud watch its intresting
explanation is strong. thanks. regards, raja giri

Amazing...

gr8 work.. arc quenching explained nicely. now I know what arc chutes are for.

Arc is like a circle it has on ends ra erri puka

wow, very nice.

 

Awesome..

 

mcb is a best of electrical component

 

nice & informative

 

Great !!!!!!!!!! nicely Explained!!!!

 

do it can get failure in its work....

Thank you.....it helped me a lot....

 

Great work..... Really Helpful,,,
Thank you so muchhhh....

Very Nice presentation.

Thank you .

thanks

Thanks 

VERY GOOD EXPLANATION

very nice & good presentation.

Thank you .

nice one thanks a lot

 

thank you VERY GOOD EXPLANATION

Hmmmmm, nice , very helpfulll

in witch case:  solenoid will trip or , Bimetal will trip

WITCH????   I'm sorry but do you have spelling difficulties,it's spelt as WHICH!!!!

Really the diagram of MCB helped me a lot in teaching.

Thanks so much.Nice and simple explanation.Do add some video clips if possible.

it is really understandable to every one easily YES I really like it very much

easy explanation which everyone can understand. awesome ,hats off !!...
Havells 32Amp MCB Can you tell me Input and output Line ?

Many thanks for this piece. Really helped me a lot!!

very good information..

Really the Device is great..functionality!!

Good explain

its very good

Very good explanation. Thanks!

"protect against over current and over temperature faults" what does this really mean... please explain more on this..  if current flow is more than 220V will it trip, or i a use 6Amp tripper and give more load to it then it will trip.. pls help me to understand. 

I want to know if there is loose connection in the joint of two wires at that condition mcb will trip or not

Excellent 

<p>In my system was falut by short circuit but the MCB not it triped. i want to know the reason.</p>

How to calculate what MCB I need for my main switch of home that takes single phase supply line ?  10AMP, 20 AMP, 15 AMP - how to know ?

 

there is a formula to calculate amp rating of mcb that is. amp rating= total load in watt/ supply voltage * power factor generally we assume power factor = 0.8
Wonderful Really a good article Thnx
Thanks for explanation but I didn't get whether it will work for low currents...
Shall I need stabilizer if I had MCB in my home... Plz anyone give me reply...
Thanks
Very super in The information thanks

ITS AMAZING ZING ZING

INADEQUATE EXPLANATION. FUSE DOES THE SAME BREAK THE CURRENT.

 

Thanks for the breif discussion of MCB the information about the MCB is brilliant..
why we don't take short circuit protection by bi-metallic strip?

very useful

how the rated current is fixed for every MCB and how it detects the current rating

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