It's a 3-pole unit built for line protection, meaning it sits at the feeder or main distribution point in a panel, not on a motor branch. The interrupting ratings are substantial: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V.
That 105 mm width is three pole spaces wide on a standard DIN-rail or panel-mount footprint — it occupies the same slot as a typical 3-pole MCCB in a SENTRON distribution board. An undervoltage release (UVR) is built in, so if your safety circuit or upstream contactor drops out, this breaker trips. The supplied basic switch is order code 3VA21105HN320AA0 — that's the internal switching mechanism; the complete breaker is what you order here.
Power loss is 12.5 W maximum, which is modest for a 100 A frame — helps keep internal cabinet temperature down. No communication function on this variant, no ground-fault monitoring — it's a straight thermal-magnetic line protection breaker with undervoltage release and auxiliary contacts.