The 4-pole configuration (three phases plus neutral) suits three-phase four-wire systems common in European and IEC panel builds. Interrupting rating is 6 kA at 277 VAC and 10 kA at 125 VDC per the spec table. The 10 kA DC rating is higher than the AC figure — relevant for DC sub-distribution in solar combiner boxes or battery-backed control panels where DC arcs are harder to extinguish.
DIN rail mount per the spec — snaps onto standard 35 mm symmetrical rail (EN 60715). The 4-pole body occupies four modular units (4 x 17.5 mm = 70 mm) of rail width. Busbar comb connections across the line side are compatible with ABB PS series pin or fork busbars; verify busbar pitch matches the 4-pole footprint when paralleling multiple MCBs in a distribution block.