> The main requirement is that I have to turn the load OFF right at the pea=
k of
> the incoming AC waveform.  So: can't use anything like a triac or back-to=
-back
> SCRs.

I don't know if Gate Turnoff Thyristors are still available, but they may b=
e worth a look, and you could probably do the isolation with a pulse transf=
ormer.
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