are there any advantages for the 3 phase ssr against 3x ssr?
I want to switch each phase on and off. I think this is only possible with 3x ssr. Am I‘am right?
That’s right, the 3 phase SSR only has one control input. You can also use 3 separate 40A SSRs.
Thanks, is it possible to switch 5 ssr 40A (from your Shop) with one Spark 4?
Yes. You can do that with just one IO module.