Yeah i knew about the Contactor latency and i stated it on post #5.

I'd never drived any 3 phase stuff. Even never used any SSR. For all my AC control i use Triac and, of course the Opto-Isolator (zero cross or not depending the day). Yeah also love the KV of insulation.. same for the power supply... never EVER use transformerless.

Now our friend have more than enough information to solve the problem.