Question:

Kindly advise me the method to select the type of MCB

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Kindly advise me the method to select the type of MCB required for any application.

For eg. I have two power supply of 230VAC of 10A each and I want to give the incoming to the power supply through a single MCB, then in this case what should be the rating of the MCB to be used.

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  1. If you get to understand the purpose and the Specifications of the MCB, you can choose an MCB's to address your specific need. The MCB needs to "break"/"Open" the circuit when the amperage exceeds per your specific need.  


  2. You should use two seperate 10 Amp MCBs independently.

    Otherwise if you use a single 20A MCB for both, if any one draws 12AMP and the other only 6 AMP, then the MCB will not trip.  But the first power supply will definitely loaded with higher load and thus goes bad.  Thus the very purpose of MCB is lost in this case.

    Hence use two seperate 10 AMP MCBs without fail if you want that extra protection.

  3. Obviously it should be at least 20 amps. Allow a little safety margin, and make it 25 amps.

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