Re: NST Filter

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

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Kidd6488-at-aol-dot-com>
> 
> In a message dated 6/7/01 09:43:23 PM Eastern Daylight Time, tesla-at-pupman-dot-com
> writes:
> 
> >
> > >thirdly, what are MOVs and what do they
> > >do, and how do they do it?
> >
> > I guess they are some bulk semiconductor material that needs to have a
> > certain amount of voltage across them before they start to conduct.  Since
> > they dissipate power in a relatively large volume, they can take quite a
> > power hit.  Basically, they act like a switch that turns on at a given
> > voltage.  Perfect for shorting out high voltage spikes.
> 
> Woa! Does that sound like another switch I know of... - Spark Gap??? The only
> problem I see with using a MOV instead of a SG is that maybe there is too
> much current to be switched by a MOV. I think...
> 
> ---------------------------------------
> Jonathon Reinhart
> hometown.aol-dot-com/kidd6488/tesla

	Problem is that MOV's, like any varistors, are NOT  switches!!!!!  They
are non-linear resistors.  No way a substitute for a spark gap.

Ed