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How to Select a MOV (Metal Oxide Varistor) for the I/O Expander (8600)

Here are some guidelines for choosing an MOV (metal oxide varistor):

    • We recommend a 250 mA fuse, so that the fuse blows before the varistor
    • Expected surges, i.e.: bigger surges = higher rated MOV
    • Choose one that has a higher rated voltage than your working voltage
    • Physically dimensions, i.e.: fits in with the wiring at the back of the meter
    • Environmental considerations, i.e.: is the unit in a location prone to lightning strikes?




Last Revised: September 21, 2007
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