Re: MOV failure

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Jason,

Since the NST is current limited, they will overheat until the solder end
connections inside them melt.  The solder will then flow around the element
under the case which will vastly reduce their voltage are short them.  They
could also catch fire and smoke and open up if the current where left on
for a long time.  In general, with a current limited NST, they are pretty
hard to break and they will short or reduce their voltage and start
smoking.  You have quite a bit of time (a minute or so) to figure it out
and turn it off ;-))

Cheers,

	Terry


At 05:36 PM 7/31/2001 +0100, you wrote:
>Hi all,
>
>Just finished my 'Terry Filter', and I was wondering what the failure state
>of a MOV is... I assume its failure state is low resistance, to makie it
>comply with ISO9901, but I could be wrong. When it fails, is the resistance
>high or low???
>
>Thanks,
>Jason
>