Extending supply from garage to another outbuilding

Yes which is why we don't use MCB's to protect semi-conductors we use semi-conductors fuses as faster than a MCB.
If you accept that (and I'm not at all sure that even 'semiconductor fuses' will often protect semiconductors), what is it that makes you believe that the outcome of your 'bulb story' would have been any different had the MCB been rated less than 16A?

Kind regards, John
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