The breaker has phase failure detection built in, which ensures that loss of one phase causes a trip rather than single-phasing the motor.
Rated voltage covers 20 to 690 V, so it works across low-voltage motor circuits from 24 V control transformers up to 690 V industrial mains. The gG fuse backup ratings (63 A at 400 V, 50 A at 500 V, 40 A at 690 V) tell you the maximum upstream fuse that still allows the breaker to clear a fault within its rated capacity — important for selectivity coordination.
Clearance requirements: 50 mm above and below, 30 mm to the side, and zero forwards or backwards clearance needed, meaning it can sit flush against the back panel or a busbar. Screw-type terminals accept 2 × (0.75 to 2.5 mm²) solid/stranded or 2 × 4 mm², with M3 screws and a 5–6 mm screwdriver shaft. Mounting position is any, so horizontal or vertical rail orientation works.