I have never used GTO thyristors but I recently had a possible application
for them and read-up on them and it seems that they are not very practical
for most applications because the gate pulse needed to turn them off must
be a substantial fraction of the anode-cathode current.

Sean



On Sat, Jun 15, 2013 at 5:34 PM, <alan.b.pearce@stfc.ac.uk> wrote:

> > The main requirement is that I have to turn the load OFF right at the
> peak 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
> be worth a look, and you could probably do the isolation with a pulse
> transformer.
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