The 108 mm width takes 12 module pitches at 9 mm, which is the standard DIN-rail grid spacing, even though the breaker itself bolts to a backplate rather than snapping onto a DIN rail.
Physical integration and wiring notes
Dimensions: 137 mm high, 108 mm wide, 80 mm deep. The 108 mm width is 12 module pitches at 9 mm, which matches the standard DIN-rail grid even though the breaker mounts to a backplate — so you can lay out your enclosure grid using the same spacing as your DIN-rail components. Connection pitch is 35 mm with spreaders, 27 mm without — that's the centre-to-centre distance between phases, important if you're using busbar spreaders or pre-formed cable sets. Terminals: Everlink lug, one per pole, accepts 2.5–95 mm² rigid or stranded aluminium/copper, or 2.5–70 mm² flexible copper. That's a wide range — you can land a 2.5 mm² tail for a small load or a 95 mm² feeder for the main supply. The front-facing connection (both upside and downside) means you can wire it without reaching behind the breaker, which speeds up panel wiring.
That standard covers the interrupting rating, the insulation coordination, and the temperature-rise limits.