File:NH-Sicherungen Hauptverteilung.jpg

Summary
Deutsch: NH-Sicherungen in einer Hauptverteilung English: Knife fuses 50A with gG characteristic. Also, you can see here widespread mistakes:

1)Load switch is not seen here, person who will replace those fuses might be killed by arc easily;  2)Hot busbars are not separated by ribs like fuse sockets. If electrician casually drops something metal there, he will have quite serious skin burns to all his life long due to too high short-circuit current. For example, pliers or screwdriver are not melting at all during short circuit and they can't initiate immediate operation of the fuse (fuse on distribution substation will trip only in 15 seconds after short circuit), so electrician will be exposed to skin damaging during 15 seconds. To correct mistakes, there should be installed load switch with door mechanical constraint (when you turn the lock to open the door, it removes the voltage at same time), which allows open the door only when voltage is removed. But as those standarts are missing, nobody does more safe way. https://commons.wikimedia.org/wiki/File:NH-Sicherungen_Hauptverteilung.jpg