[Amps] Solid State Relays

[Phil Clements]

> Anyone had any experience using the Opto22 series of SSR's in Power
Supply
> construction ?
> I've got two Opto22 Model 240D10-17 Devices and was thinking about
using
> one to control mains supply to a 3kv Power Supply. They supposedly
use
> zero crossover switching but I was wondering about their behaviour
during
> fault conditions. I will be using G3SEK Boards to control things,
and
> ideally drop off the control voltage on the Opto22 during a fault,
thereby
> removing the mains supply
>
> Is this a better way then using a beefy relay...and are these things
> reliable ?

I have reservations about these things, Glenn. I have used them in the
past, but not for a QRO application. I do not want the thing turning
on unless I want it to. There have been "war stories" and "urban
legands" about RF triggering, etc. The zero crossing feature is of no
benefit, as it provides no soft-start action because it is too fast.
If there is a better way other than a beefy mechanical relay, I have
not heard of it!

(((73)))
Phil, K5PC