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Insight - How MCB works

Written By: 

Arpit Jain

The image below shows the arc chute used in the MCB for arc quenching purposes.

 
Arc Chutes in MCB
 
Finally the next images shows how the arc chute is positioned in the MCB. The fixed contact is extended to the arc chute. This is done so as to transfer the arc to the interior of the breaker. The arc is broken into smaller arc by the arc chute. These segmented smaller arc have a very small potential and hence get naturally dissipated.
 

Position of Arc chutes in MCB
 
On removing the holder which holds the arc chute, the mechanical structure and arrangement of the arc chute is visible in the next image.
 
Structure of Arc chutes
 

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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