Re: High Voltage but Low Current fuses...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mark Broker by way of Terry Fritz <teslalist-at-qwest-dot-net>" <mbroker-at-thegeekgroup-dot-org>

Excellent idea, Antonio!  I believe that some mid-high voltage fuses (say 
13.8kV) have a stiff spring at one end to pull the gap apart.  I would 
think that would work here, too, only with pen springs or similar.  But 
that's probably more complex than a simple weight.  The weight mustn't be 
too large or it could promote a premature failure over time - copper creeps 
when hot.

Regards,

Mark Broker
Chief Engineer, The Geek Group

On Mon, 14 Jul 2003 21:02:37 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:

>Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
>Tesla list wrote:
> >
> > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
>
> > 1.  ~30000 V withstand and break.
> >
> > 2.  About 250mA of fuse current, but NOT at all critical.  The current is
> > either 100 mA (normal) or 500 amps (Yipps!!  turn it
> > off!!)  ;-))  Basically a far "much less than 1 amp" but very high voltage
> > fuse...
>
> > Any ideas are welcome.  Both of my little projects seem to need darn good
> > high voltage fuses...  The fuses themselves might become the third project
> > ;-))
>
>Maybe this, that is easy to assemble:
>A vertical fuse made with thin wire, with the upper end secured at a
>fixed support, and the lower end connected to a flexible wire and a
>weight that can fall if the fuse opens.
>
>Antonio Carlos M. de Queiroz
>