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Re: NST Filter
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>"
> In a message dated 6/7/01 09:43:23 PM Eastern Daylight Time, tesla-at-pupman-dot-com
> > >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
Problem is that MOV's, like any varistors, are NOT switches!!!!! They
are non-linear resistors. No way a substitute for a spark gap.