The DF3FN32 is a Schneider Electric TeSys GS NFC cartridge fuse — cylindrical, 22 x 58 mm, rated 32 A at 690 V AC, with a gG (general-purpose) fuse curve and striker for local blown-fuse indication. Supplied as a set of 10. The gG curve means it protects against overloads and short circuits in general-purpose circuits — motors, transformers, lighting, and distribution feeders — where the inrush is moderate and full-range protection is needed down to the overload region. The striker pops out when the fuse blows, giving a visual signal at the fuse holder or disconnector.
In a 400 V panel, the same fuse still clears at 32 A — voltage rating is an upper limit, not a derating factor. The 22 x 58 mm physical size fits standard NFC (French standard) fuse holders and disconnectors, including the TeSys GS range. The striker is a mechanical flag that extends when the fuse element melts. It can be used to trip an auxiliary contact or simply as a visual check during panel walkdowns. If your holder doesn't have a striker window or microswitch, the striker still works as a push-pin indicator.
The 22 x 58 mm format is a common European fuse size for 32 A branch circuits in industrial control panels — typically mounted in a fuse-disconnector switch or fuse holder on DIN rail. The gG curve coordinates well with downstream motor starters and upstream MCCBs, provided the selectivity study confirms the let-through energy. Because this is a cartridge fuse (not a semiconductor or ultra-fast type), it is not suitable for protecting power electronics or DC bus circuits unless the application note specifically calls for gG. Stick to AC distribution and general-purpose protection.