It includes phase failure detection, which will trip the breaker if one phase is lost — critical for preventing single-phasing damage on a three-phase motor.
The S0 frame size means it occupies a 45 mm width on the rail — two modules wide. Depth is 97 mm, which is standard for this class; check your gland plate clearance.
The 100 kA breaking capacity at 400 V AC (and at 240 V, 500 V, 690 V) means this breaker can be used in high-fault-current panels without requiring upstream current-limiting fuses — it is self-protecting up to that SCCR. The Class 10 trip protects standard NEMA design B and IEC induction motors during start-up; if your motor has a longer acceleration time (high-inertia loads like fans or conveyors), you may need a Class 20 or 30 trip, but for most pump, compressor, and conveyor applications, Class 10 is correct.