| Re: Surge Suppressors
I am sure you are more up on this subject than I am, but I just read an article by Dr. Craig Hillman (who ever he is) and he states:
"Electrical stress applied to a ZnO MOV for longer than a few microseconds causes chemical changes at its grain boundaries, causing their diode-like characteristics to become more ohmic (diodes become resistors).
-- MOV turn-on voltage decreases.
-- MOV leakage current increases."
Of course he doesn't define what "electrical stress" is, but I would think that a hit from a lightning bolt may qualify.
|