Hey guys, I have a question regarding MOVs... So I want to put a transient filter on my power supply, but I don't know how to choose a MOV because their ratings don't make sense to me. I think a transient filter (surge suppressor), should look something like this: RV1 is the varistor (MOV). It doesn't make sense because by nature I thought the voltage rating should be around say 200V and the clamping voltage around 135V (US 120V Power). But it turns out that if I wanted a MOV with a clamping voltage of 135V, then it would only be rated for about 40V continuous.... I'm utterly confused. What should the value(s) of RV1 be? Thanks.