It's the dedicated overcurrent device for a motor branch — not a general-purpose breaker. Rated short-circuit breaking capacity hits 100 kA at 400 V (and at 240 V, 500 V, 690 V), so it can safely interrupt a bolted fault at the motor terminals without needing an upstream current-limiting fuse in most panel designs.
Dimensions are 45 mm wide, 106 mm tall, 97 mm deep. Main circuit connections are spring-loaded terminals accepting 2 × (0.5 to 2.5 mm²) solid or stranded — no screw torque to verify, faster wiring in the panel.