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Insight - How MCB works

Written By: 

Arpit Jain
 
The heart of this mechanism is the solenoid which works on the principle of electro mechanism. As mentioned earlier one end of the coil is connected to the moveable contact by means of a thick wire for current to pass through it in the ON state. The coil of the solenoid is designed in such a way that when current passing through it is within the permissible value, the magnetic force produced is not enough to pull the plunger. When the current exceeds the permissible value, the magnetic force also increases and this magnetic force pulls the plunger inside towards the center of the coil.
 

Solenoid

 
When the plunger moves it also pulls the moveable contact and forces it to separate from the fixed contact thereby tripping the circuit. The moveable contact is connected to the knob by means of mechanical arrangement and forces the MCB knob to fall down. The plunger is connected to a spring from inside the electromagnetic coil and as the plunger moves towards the center of the coil, the spring gets loaded. After the MCB trips (i.e., the moveable contact separates from the fixed contact and the current stops flowing) the spring forces the plunger back to its normal state without disturbing the moveable contact.
 

Movable contact plunger arrangement

 

 

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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