[Amps] HV Fuses

[Angel Vilaseca]

How about using a string of mains-voltage fuses in series?
Has anybody tried this?
After all, that is what we do for every component of our HV power 
supplies: capacitors, diodes, resistors... are all mains-voltage rated, 
wired in series
Some mains-voltage fuses are sand-filled too. I suppose they should all 
be from the same batch, so they would melt at precisely the same time.

Angel Vilaseca HB9SLV

K1SG at aol.com a écrit :
> In recent threads, there have been a number of comments about high voltage  
> fuses.
> Carl mentioned sand-filled fuses, something I hadn't heard of.
> I checked the Mouser catalog for HV fuses, and was stricken with  
> sticker-shock...$38 for a fuse?
> OK, we re-think this one...
> I know that an old but workable approach is  to use  a thin piece of wire 
> as a fuse...mount it between a couple of  standoff insulators, and it should 
> function fine, and if current is  substantially too high, the fuse wire 
> blows. How do you figure the appropriate  size wire to use? And then, how do you 
> go about ordering 6" of #30 wire, or  whatever it is? If you need more 
> current capacity, to use the above example, can  I put two strands of #30 wire 
> in parallel, and expect them to function as a  reliable fuse?  I'm always 
> worried about kinking the wire, or if it's  enameled, sanding off more than 
> just the insulation.
> The plan is to fuse the HV output of a 5KV 2A supply to a 3X3, which of  
> course will only be used at the legal limit or into a dummy load. 
>  
> Steve  Gilbert
> K1SG
> K1SG at AOL.com
> 508-435-9133
> FN42fe  
>
>
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