We have a nice powerplug / socket type here in Germany that has become forgotten and i can't see why .
It's called the "Perilex" connector .
The design is really great - it's a 3phase/n/gnd connector rated 400V 16A or 25A . It is polarised , current coded , touchproof and small compared to other 3phase connectors .
You can still buy it and it was not banned by the authorities - it just did disappear from regular use about 30 !!! years ago and nobody seems to know it still exists . . .



My grandfathers oven used this connector - hmmmm - the wallsocket might still be there . . . (now i am curious)

We go a little bit off topic here but who cares . . . - nice blown PSUs - looks like a lot of fun
