how did we can select MCB selection?

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techsudheer

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plz help me,
how did we select MCB ? plz give me formulae...... ex: 10kva 3ph-1ph out stablizer with output 110vac ... wat is the rating of MCB input side as well as output side
 

To protect your stabilizer and its supply wiring you need an MCB at the source end rated at 10kva/phase current +10%. On the output side, the same argument, if its feeding a single 10kva load then 100A would do. If its feeding multiple circuits then each circuit should have an MCB rated for each one and its individual cabling.
Frank
 

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