Nice to see that very old Holec switchgear :-) It must be at least 45 years old. Normally the fuseboard would be assembled so that the circuit switches would be on top of the circuit fuse.
Strange setup, didn't see that one before.
I must say that the main switch you use is common known for faulty contacts, sometimes it doesn't switch a pole (which could be your neutral, which would be offcourse catastrofal).
