Finding a 3VDC/230VAC 30amp relay & 400VAC/5VDC PSU

Hi, I'm very happy for all the help I can get so thank you in advance!

I want to make a simple start and stop motor controller with my ARDUINO MKR WIFI 1010.
But I've a problem trying to find components, I live in Sweden and local components are limited. I'm open to ordering online but would prefer to get the parts as soon as possible.

Relay: Input max 3.3VDC, load: 230V and the current can get up to 30amp but will probably never pass 16amp (it depends on the motor that I'll try to control).

PSU: 400VAC/5VDC

Have you thought about a solid state relay (SSR)? Most will work with control voltage down to 3VDC.
400VAC sounds like 3 phase, if it is a star connected system could you get 230V from 1 phase to neutral?

Thanks! Foundation several ssr that will work perfectly.

You’re right, it’s a 3 phase but I won’t get access to the neutral. So my only option is to feed it between phases. Think finding a good psu will be the hardest part.