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Re: [TowerTalk] MOVs in Stackmatch

To: <>
Subject: Re: [TowerTalk] MOVs in Stackmatch
From: Rick Stealey <>
Date: Wed, 3 Jun 2009 22:08:58 +0000
List-post: <">>

 Is there any 
> way with minimal equipment to see if an MOV is still good? The relay 
> coils all appear OK, so I guess they did their job.

If you put dc on them, with a series resistor to limit the current to about 1 ma
you will see the breakdown voltage.  
I have done this many times, and used MOVs on rotor control lines, and tested a
 Polyphaser rotor protector which is just MOVs across the lines and know this 
will work.
If you find zero volts or no current flowing you know you have a blown MOV.
You can get huge rated MOVs from Mouser for 30-50 cents each.
Here is a sample of an approximately 30 volt MOV.  Mouser part #576-V39ZA20P.  
This will get you to the right page on the Mouser site.

Rick  K2XT


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