The Schneider Electric DF2KN1501 is a DIN NH3 blade fuse from the TeSys range, rated 500 A at 500 V AC with a gG (general-purpose) fuse curve. It comes as a set of three, without striker. The gG curve means this fuse provides full-range overcurrent protection — it clears both overloads and short-circuits — making it suitable for protecting cable feeders, switchgear, and general distribution circuits in industrial panels. The NH3 blade form factor fits standard DIN NH fuse holders and switch-disconnectors common in European-style panel builds, so it slots into existing fuse bases without adapter hardware.
The 500 A rating at 500 V AC is the continuous current the fuse can carry without nuisance opening, and the voltage it can safely interrupt under fault conditions. For a 400 V three-phase distribution board, this fuse sits downstream of a main breaker sized for the transformer or feeder — it protects the branch circuit, not the whole board. The NH3 physical size is the largest of the standard DIN NH blade sizes (NH00, NH0, NH1, NH2, NH3). It occupies a three-pole fuse holder roughly 200 mm wide per pole, so verify the enclosure fill factor before committing the panel layout. The gG curve provides a time-current characteristic that coordinates with downstream MCBs and upstream molded-case breakers in a selective distribution scheme — it holds for several seconds at 2× rated current, letting a branch fuse clear first.