Vielen dank Texas Ranger und Wolfgang.
That German article explains it perfectly.
I didn't know there were even D V sizes in the old days.
This was and still is a great system for fuses, especially the colour coded indicators which popped out when a fuse blew.
On the higher rating 25 Amps and over sometimes a fuse could work itself loose and cause arcing within the base.
I got a 35 Amp fuse somewhere in my workshop with arcing marks.
If I find it in my archives I will make a photo of it.
Regards Raymond
