..and remember if the tracks to the MOV blow, this disables any
protection you may have had.... Your supply should ideally be routed
through the MOV pads, not have them T-off the supply tracks.=20

On Tue, 26 Nov 2002 17:48:31 +0200, you wrote:

>>Given that an MOV is used to shunt high voltage spikes, but not =
actually
>>carry current, do the traces have to be bulked up for them?
>
>Not true. When the MOV breaks down, it carries whatever current the =
source
>will deliver. If the Joule rating of the MOV is exceeded, it will be
>destroyed, or seriously degraded. If not, the MOV has hopefully served =
its
>purpose, and your circuit will go on to live another day. If the tracks =
to
>the MOV blow as a result of the surge, no further protection will be
>afforded by the MOV. I always use the thickest possible tracks that the
>design will allow.
>
>Regards
>
>Ian Rozowsky

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