The Siemens 3RV6011-0GA10 is a SIRIUS motor protection circuit breaker in the Size S00 frame, rated 0.63 A operational current with a thermal overload release (Class 10) and a magnetic short-circuit trip. It protects three-phase motors up to that current on 50/60 Hz supplies up to 690 V AC-3.
The 0.63 A rated operational current at AC-3 (400 V) is the motor-load switching rating — this breaker is sized for a small motor, fractional-horsepower pump or fan, not a 5 kW drive. The 5 W total power loss is low enough that no forced cooling is needed inside a sealed panel. The screw terminals accept 2x (0.75 to 2.5 mm²) solid or stranded, or 2x 4 mm², with a torque range of 0.8 to 1.2 N·m. That covers standard motor feeder wiring up to about 14 AWG.