I agree fully with NOT using Radio Shack low quality run-off manufacturer seconds. Use NTE 140V. The trick is you need to use THREE. One across the hot and neutral. one from hot to ground and one from neutral to ground. MOV's are a funny dog they do not usually short but degrade very quickly depending on number of incoming spikes they suppress. Used them alot to supress the reverse EMF in electromagnetic locking devices, 8+ H, yes henrys! , not micro or milli. suggest replacing annually. Kevin
--- On Mon, 6/7/10, kq7dx <kq...@yahoo.com> wrote: From: kq7dx <kq...@yahoo.com> Subject: [Repeater-Builder] MOVs for power supply primary To: Repeater-Builder@yahoogroups.com Date: Monday, June 7, 2010, 8:38 PM Hello to group, Is putting a MOV from hot to ground, neutral to ground, on the primary of the transformer of the power supply a good idea.. I have a ICE surge suppressor on in front as well but thought I would put more inside the supply for back up. Also, are the MOVs that radio shack sell any good. Rated at 130VAC. Any body used them... Last question: when MOVs fail or take a surge do they fail in a shorted condition taking out the fuse till the MOV can be replaced, or do they blow or fail open leaving the supply working. Thanks for the help.. 73s
