A quick European wiring puzzle with a simple answer

[Lucien Nunes]

Following from a recent thread mentioning some continental electrical practice, I made this mock-up of something you might see in an older installation in a certain West-European country. It's not standard practice now but is widespread enough to have a specific name. What is the name of this specific circuit arrangement in the local language? Not sure if we have any sparks from the country in question on here but please let the Brits have a try!

 

[Lucien Nunes]

Interesting, a Polish one. I think it uses the normal Stotz mechanism, some POLAM examples have the Stotz-Kontakt logo on as well, this one doesn't though. FWIW the old Wylex pushbutton plug-in MCBs, from before the lever type, also used the same mechanism under licence.

I have a few nasty modern Chinese clones here, one of which rather alarmingly jammed in the on-position the first time I tried to demonstrate it. Not what you want in an MCB!

 

[LastManOnline]

Interesting, a Polish one.

Yes. I googled it and was surprised to see they are still been made. The one in the picture dates from early eighties but possibly earlier. Anyway if its of any use let me know. You are more than welcome to it.
As an aside, you mentioned you would like to get examples of various wiring systems in UK abroad. I wondered if you were aware of the Dutch, rather novel solution to providing an earth fault return path after their metallic services were replaced with plastic?