The lower 13 kA figure is the unconditional breaking capacity; the 50 kA figure applies when coordinated with an upstream fuse or breaker (type 2 coordination). For a 480 V system, the interrupting rating drops to 16 A, meaning this is sized for the motor's full-load current, not the fault level. No ground fault detection, so if that's required, add a separate ground-fault relay or choose a variant with that feature.
Screw-type terminals for the main current circuit accept 2× (0.5 to 1.5 mm²) or 2× (0.75 to 2.5 mm²) solid or stranded wire. Use a PZ1 or PZ2 screwdriver with a 5 to 6 mm shaft diameter. The M3 terminal screws are standard for this class; torque them to the manufacturer's specification (not listed here, but typically 0.8 to 1.2 Nm for M3 in this series).