It also detects phase failure, which is common in field conditions where a blown fuse upstream can single-phase a motor and cook it.
Breaking capacity — what the 100 kA rating means
This breaker carries a 100 kA breaking capacity at 240 V, 400 V, 500 V, and 690 V AC.
Clearance requirements: 20 mm upward, 20 mm downward, 9 mm to the side, zero forward or backward. That 9 mm side gap is tighter than some breakers; if you're packing multiple units side-by-side, make sure the enclosure's internal width accounts for it.
Terminals and wiring
Main circuit terminals are screw-type, sized for M3 screws. Accepts two conductors per terminal: 2× (0.5 to 1.5 mm²) solid or stranded, or 2× (0.75 to 2.5 mm²). That's enough for a motor feed cable up to about 2.5 mm² — typical for fractional to small integral horsepower motors. If your motor draw calls for larger wire, step up to the next frame size in the SIRIUS family.