The DF2JN1251 is a TeSys GS DIN NH2 blade fuse, rated 250 A at 690 V AC with a gG (general-purpose) fuse curve, sold as a set of three. It belongs to the TeSys range of industrial control and protection components, designed for line-side or load-side protection in motor starter and distribution panels. The gG curve means it handles both overload and short-circuit currents — it clears fast on high faults but tolerates moderate inrush without nuisance opening, which suits cable and general equipment protection rather than pure semiconductor or motor-only duty.
The NH2 blade size follows the DIN 43620 standard, so it slots into standard NH2 fuse bases and switch-disconnectors on DIN rail or panel-mount assemblies. The 250 A rating and 690 V AC operational voltage cover most 400 V three-phase distribution and motor feeder circuits in European-style panels. The set-of-three packaging matches the three-phase line count — one fuse per phase. No striker means no visual or auxiliary trip indication; if that is needed for remote fault signalling, a striker-equipped variant would be required.