[lug] Aging Surge Protectors

Dan Julio djulio99 at yahoo.com
Fri Aug 27 11:49:45 MDT 2004

These devices often use MOV (Metal Oxide Varistors) as
the active element to absorb surges.

These devices degrade over time, especially as they
are exposed to surges near their limits.  Eventually
they cease to be able to absorb the extra energy.

Many surge protectors have a LED or neon light wired
in series with the MOV to indicate that it is still

Some high-end protectors will shut down (cease to
provide AC) when the protection circuitry is no longer


--- Gordon Golding <gordongoldin at netscape.net> wrote:

> I'm putting in some servers and client workstations
> - somebody just said that as surge protectors age,
> they lose their capacity to protect.
> Has anybody ever heard this?  

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