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Re: [TCML] Idle musings about surge suppressors


Be aware that MOVs often fail shorted. Be sure to put them on the outboard side of a big breaker. The breaker won't trip fast enough to limit the surge suppression capability of the MOV, but it will prevent a big problem if a MOV fails in shorted mode. I've had this happen on my own house.


On 3/15/2010 2:44 PM, Steve Ward wrote:
It might be worth considering what happens to these things when they DO have
to clamp a surge.  Is your construction material going to catch fire from
the heat generated by the MOV?


On Mon, Mar 15, 2010 at 12:26 PM, Reverend Fuzzy

Most of them are just that... MOV's  When I found that out, I built my own
with 3 heavy-duty MOV's on a piece of perfboard, then
covered the whole board in a chunk of heat-shrink tubing... wound up with a
module as big around as a small matchbox, with one red,
one black, and one green wire coming out of the end... total cost, under
(black to phase A, red to phase B, green to neutral/ground bus bar.)

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