It belongs to the TeSys DF range and is supplied as a set of 10 pieces. The gG curve means it protects against overloads and short circuits in cable and distribution circuits — it's not a motor-protection fuse (aM curve), so it's sized for the conductor, not the load.
The NH000 form factor fits NH000 fuse holders and switch-disconnectors on DIN rails. The 16 A rating at 690 V AC is the continuous current the fuse can carry without nuisance opening; the gG curve defines the time-current characteristic for overload and short-circuit protection.