The Siemens 3RV1031-4FA10-0BA0 is a SIRIUS motor protection circuit breaker rated for 40 A continuous current and 18.5 kW motor power at 400 V AC. Ground fault detection is not included, so if that is required, an external ground-fault module or relay must be added.
The 55 mm width and 140 mm height are standard for this SIRIUS frame size; depth of 149 mm leaves clearance for the screw-type box terminals on the main circuit and the auxiliary contact block on top. Zero clearance required at the back or sides, so adjacent devices can butt directly against it — no derating for side-by-side packing in a crowded panel. The auxiliary and control circuit also uses screw terminals. Terminal capacity is generous for the 40 A rating — no need to pigtail down to a smaller wire.