Hi Jack!
Sorry, I was unclear in my definitions. I was using the wording from the German parts store I was looking at at the time.
The 80A (black) fuse has prongs that extend down like a big staple, and gets bolted to the long sides of the box.
The others plug into the box, where each socket has 2 prongs sticking up that then go into the fuse.
Have I got the right idea here?
Cheers
James