> > > If Solid State Relay SSR happen to be a thyristor it will only allow
> > > a limited dv/dt or it will fail to turn off. A common source of
> > > dv/dt is inductive or maybe capacitive load and it happens because a
> > > thyristor turn off at zero current although a reactive load do not
> > > have zero voltage at zero current. Problem is circumvented by a
> > > properly sized capacitor in parallel to limit voltage rise during
> > > turn off.
> >
> A dv/dt failure is usually destructive.

I think it is a failure to turn off.

> > How would one determine "properly sized"?
> 
> That is a big compromise because that capacitor is a leakage across it, 
> enough to knock you around if its over done. A.02 u-f, 1 kv ceramic 
> might help.  But you'll probably feel a buzz if you get across it.

I do not think output should be considered safe anyway.

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