>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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