Thread: Fuses
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Old 15th Jan 2008, 3:12 pm   #22
GMB
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Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
Default Re: Fuses

My experience is that MCBs are much faster than fuses and so spoil the blowing-chain.

My big variac can blow any MCB through the smallest fuse due to the very short but huge amplitude switch-on surge. I actually fitted a smaller MCB to it in the hope that it would beat the ring 30A but in practice they both trip together.
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