I am not slagging off my apprentice for a change.
That is a Bus bar tap off from a 100A bus bar that should have 3 x 16 fuses in the tap off.
When I phoned the wanker who installed it (the co. name was on the install sticker) to tell him what was wrong he said "someone must have stolen the fuses I put in".
Of course they did:-)
And the magic pixies also stole the fuses from your other taps offs as well.