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Insight - How MCB works

Written By: 

Arpit Jain


Over heat protection
The MCB’s also provide protection against overheating. It uses a bimetallic strip for the same. The arrangement of the bimetallic strip is shown in the image below. The bimetallic strip is made up of two metals with different temperature coefficients. When the current flows through the bimetallic strip, it gets heated. The heating results in bending of the bimetallic strip. The more is the heating, the more is the bending. The bimetallic strip is mechanically connected to the tripping mechanism by means of a metal strip as shown in the image. When the bimetallic strip bends it forces the metal strip to pull the plastic flap which in turn triggers the tripping mechanism after certain allowed temperature limit for which the bimetallic strip is designed.  




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.