For a panel builder, that means this breaker can sit on a distribution bus with a high available fault current and still clear a dead short without cascading upstream.
The footprint is 45 mm wide by 97 mm deep by 97 mm tall — that's a three-module-wide DIN rail footprint typical of S00 breakers. That means you can pack these tight on the rail as long as you leave breathing room for arc quenching above and below.
The rated value at 230 V is also 100 kA, so it holds its interrupting rating across the common low-voltage range. The AC-3 maximum operating rate is 15 operations per hour, which is fine for a protection device that trips infrequently — not a switching contactor. Terminals are screw-type for the main current circuit, accepting 2x (0.75 to 2.5 mm²) solid or stranded, or 2x 4 mm². Screwdriver shaft diameter 5 to 6 mm, Pozidriv size 2 tip. No ground fault detection, no phase failure detection — this is a basic thermal-magnetic breaker, not an electronic motor protector.