[lug] Aging Surge Protectors

Paul E Condon pecondon at mesanetworks.net
Fri Aug 27 23:26:07 MDT 2004

On Fri, Aug 27, 2004 at 05:31:47PM -0600, Mr Viggy wrote:
> Like I said, some kind of filter!
> :-)
> MOV's are not that bad, for personal use (110V).  Actually, I thought 
> they shunted the hot and neutral lines together (well, I guess neutral 
> is ground).

Actually hot and ground might really be better, if there is a ground
fault interrupter (GFI) upstream of the surge protector. If GFI trips
fast enough, it will limit the energy that gets dumped into the MOV
and extend its life.

> Viggy
> Timothy Klein wrote:
> >On Friday 27 August 2004 12:39, Mr Viggy wrote:
> >
> >>I'm not sure what high end units use, though.  In my applications,
> >>I used MOV's across switches attached to steppers (needed to shunt
> >>off the extra current when we swithced the stepper).  They probably
> >>use some kind of filter
> >>(just guessing here), similar to a UPS system.
> >>
> >>Viggy
> >
> >
> >They use a capacitor bank to slowly bleed current back onto the mains, 
> >if I remember right.  The MOVs use a massive shunt to ground, which 
> >opens up different problems.
> >
> >Tim
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Paul E Condon           
pecondon at mesanetworks.net

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