The 2-pole configuration switches both phase and neutral — the neutral is not switched separately, so this is a double-pole (2P) device, not a 1P+N with a switched neutral. Rated voltage of 400 V AC between phases means it handles line-to-line faults in a three-phase distribution board when used on a single-phase branch. The C-curve means magnetic trip occurs between 5 and 10 times rated current (30–60 A for this 6 A unit), so it will ride through the brief inrush of a bank of fluorescents or a small transformer but trip quickly on a hard short.
Environmental and installation notes
Halogen-free and silicon-free construction avoids corrosive off-gassing in a fire. Sealable with a lockable cover for isolation locking. Mounting position is any, which simplifies panel layout.