Hi Neil,

I think you are correct about the 130V but the 20 can mean the diameter of
the part (20mm).

Have a look at this:
http://www.maida.com/assets/docs/literature/Standard_Series.pdf

I don't know if Maida parts would be a good replacement (I've never even
heard of them before) but that PDF at least explains their marking codes,
which seem to be similar to the one you have.

Sean



On Thu, Aug 28, 2014 at 3:45 PM, Neil <picdude3@narwani.org> wrote:

> My trusty 30-year-old (yes, I use "trust" in the same sentence with
> something over a decade old) Heathkit AC power distribution base started
> blowing fuses and I popped it open to find this blown MOV...
> http://veisystems.com/stuff/hkbc.jpg
>
> So it's a 130VAC MOV with a "rating" of 20.  But a couple questions so I
> can find a suitable replacement:
> - 130V is the continuous max voltage, correct?
> - What exactly is "rating"?  It is the joules that the device can handle?
>
> If so, I can just pick up anything with a 130VAC, 20J (or higher)
> rating, correct?
>
> Cheers,
> -Neil.
>
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