[Elecraft] [K3] Overvoltage protection?

[Dan & Jean]

I recently purchased a 35 amp Astron power supply at a hamfest (in great condition).  Upon inspection, I found that the crowbar SCR had failed, and had been removed.

Although I've replaced the SCR, I'm wondering if the K3 has overvoltage protection of some kind?

As an aside, I would like to test the crowbar circuit in the Astron, but with that big capacitor in there, I'm kind of hesitant.  That big capacitor would have to discharge before the primary fuse would blow (maybe blowing the SCR)--right?  I'm thinking of putting a 25 amp fuse in series with the capacitor.  Anyone address this before?

Thanks,
Dan - W4TQ