Rick Stealey wrote:
>
> 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.
>>
>
> Pete,
> 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.
>
Depends on what you mean by huge. I have some 50,000 Joule capacity
MOVs and they are big. Used across the input to a few hundred KW at
440 VAC. When one of those lets go you don't really want to be close
unless wearing a face shield and really good hearing protection. I've
seen them leave a pair of #6 wires standing straight out from where the
MOV had been and they are louder than a 12 ga fired in a small space.
73
Roger (K8RI)
> Here is a sample of an approximately 30 volt MOV. Mouser part #576-V39Z
> A20P.
> This will get you to the right page on the Mouser site.
>
> Rick K2XT
>
>
>
>
>
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