Re: Need GE MOV data - Part II <Littlefuse>

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Sparktron01@xxxxxxxxxxx 

Gary

Part II -- Littlefuse has acquired the complete GE Varistor product
portfolio, here is URL to the LA series previously discussed...

http://www.littelfuse.com/data/Data_Sheets/LA.pdf

Regards

Dave Sharpe, TCBOR/HEAS
Chesterfield, VA USA

 -------------- Original message ----------------------
From: Sparktron01@xxxxxxxxxxx
> Gary
>
> Watch the MOV's.  They have a nasty habit of failing shorted.
> I was testing some brand new electronics assemblies early
> in  my career.  The assembly had GE V130LA20A
> (130Vrms 200Vpk, 20J) across incoming AC line.  Plugged
> unit in, turn Control Power on ..... KKAAAAABOOOOM!!!!!
>
> I thought the world had ended (and I had bought some
> electronics   :^C )  It was loud enough that I was surrounded
> by co-workers in about 10 secs.  Turned out the MOV's
> were _soldered_ into crimp connectors, then tightened
> down in a screw barrier teminal block.  Soldering MOV's is
> a NO-NO unless you heat sink them.  You will shift the zener
> knee voltage LOWER, and they will blow-up!  OBTW, after
> replacing with a new MOV _mechanically_crimped_ into
> stak-ons and rewiring terminal strip, everything was OK and
> no damage to sub-assembly was done (except for the black
> smudge spot on the aluminum bracket ...  :^D  )
>
> If you do use a MOV, put an OCD (fuse, CB) in line with them to
> limit the "magic smoke release" when they do fail.
>
> John A.:  This tale of excitement also colloborates your
>                USN comments.  The MOV when is let go threw a
>                plasma fireball the size of a tangerine!!  I wasn't
>                hurt; my pants, that's a different matter   ;^)
>
> Regards
> Dave Sharpe, TCBOR/HEAS
> Chesterfield, VA. USA
>
>
>
>
>  -------------- Original message ----------------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
> > Original poster: "Lau, Gary" <Gary.Lau@xxxxxx>
> >
> > I'm looking to add some MOV protection to my Variac/control box.  I
> > found a handful of MOV devices, but I can't seem to locate any data
> > sheets on the web.  The devices are marked with the GE logo, "V150
> > LAX1002".  Does anyone have a reference or cross-reference book to
> > indicate what I have?  I'm hoping that the V150 indicates that it will
> > be fine at 150Vrms, on the 140V side of my Variac.
> >
> > Thanks in advance,
> > Gary Lau
> > MA, USA
> >
> >
>
>