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Posted by Pop on August 10, 2005, 9:53 am
An MOV fails open-circuit. No surge protection ckt I
ever knew of would fail open circuit as that presents a
further hazard in the wiring to the device during the
overcurrent until it pops the breaker.
The poster who mentioned tranzorbs, etc. is also
correct in his post. A "safety" device will not create
an additional hazard (as in popping a breaker) when it
operates.
I hope you'll come back and let us know how your
solution works; I've seen your past posts about this
and found them interesting.
Just a final note: You do know that the ground to the
whole system is good, right? Surge protection such as
you need requires a good ground to be reliable. You
probably already answered that, but ... can't hurt to
check.
HTH,
Pop
> Hi,
>
> Thanks for such good info.
>
> BTW: When an MOV fails due to being unable to
> dissipatge too many Joules, or overcurrent, how does
> it fail ? As an open or as a short between the lines
> it was trying to protect ?
>
> Thanks,
> Bob
> -------------------
>> Hello,
>>
>> Thinking of installing an Intermatic AG series
>> surge protector across a single 110 V
>> line to help protect a circuiit board in a furnace.
>>
>> Clamping voltage is given as 490 V.
>>
>> Seems awfully high.
>>
>> Wouldn't most solid state devices blow (well) before
>> this level ?
>>
>> Thanks,
>> B.
>>
>
>
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