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From: John R Walliker <jrwalliker@gmail.com>
Newsgroups: sci.electronics.design
Subject: Re: Survivor!
Date: Fri, 22 Mar 2024 11:28:16 +0000
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On 20/03/2024 15:22, Bertrand Sindri wrote:
> Cursitor Doom <cd@notformail.com> wrote:
>> Yesterday I had 2 minutes to waste so I blew up another electrolytic
>> capacitor - or rather I *tried* to.  A 10uF 10V cap across the output
>> of a variac with Vo set to 240VAC.  There was a considerable *pop*
>> but no bang and it turned out the T3.15 Amp fuse in the variac had
>> blown spectacularly - but the cap had survived unscathed!  Tested
>> fine for capacitance and ESR!  I never would have believed it.  Just
>> wondering how the hell it didn't get destroyed...
> 
> Obviously it was able to survive the overcurrent situation for long
> enough to blow the fuse in the variac.  Since, as usual, you've left
> off all useful information (i.e., make and model of cap) we can't
> comment any further.
> 
> The fuse also did it's job, which is to protect downstream components
> from overcurrent situations by blowing before the downstream items
> themselves blow up.
> 
> 
More importantly the fuse protected the variac.  They are
very intolerant of even quite modest overloads.
John