Interesting Arend to see a Dutch installation. [Linked Image]
I originally emigrated from NL to New Zealand in 1988 and have worked in my time on a lot of those installations altough mainly with the diazed screw in Weber type fuses.
I see that the MCB's are 2 pole so they switch Phase and Neutral.
In the older srew in fuses panels the On Off switch switched the Phase and Neutral.

I actually use one of the 8 way panels in my downstairs workshop although to be compliant with the MEN system here I only switch the Phase. I can post you a piccie if you want to see it.
What I especially like is the standard colour coding on the fuses. e.g. Green 6 Amps, red 10 Amps etc. I will post a thread regarding this.

The product of rotation, excitation and flux produces electricty.