John N. Power wrote:

>The generic name for an isolated power driver like this is a
> "Solid State Relay" or SSR. These are modules which contain
> the output device (SCR, TRIAC, MOSFET or whatever), with
> an isolated input device (optocoupler, etc).

I am aware of SSR products, but I have yet to find a single devce that would be
capable of switching ac or dc.
For example, the vast majority of SSR devices I have found use a triac output
 with zero crossing detector and snubber network) and thus are not the best
choice for dc switching I would have thought?

Alan

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