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Insight - How MCB works

Written By: 

Arpit Jain
The dismantled mechanical parts used to pull the knob when the tripping takes place. When the MCB gets tripped the moveable contact which is connected to the knob using these mechanical parts pulls the knob to the off position.
mechanical parts in MCB
The following image shows the arrangement of the plunger, coil and the spring.



So Simply explained..was feeling the urge to know about the MCB mechanism .

does the frequency matters for a MCB? 



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i have MCB switch but i doesn't work

please tell that is it manadatory to connect Input supply to input terminal or we can connect it to output terminal also.