Ground fault detection is not included, so if that's needed, a separate ground-fault relay or a different 3RV variant is the call.
The 45 mm width means it occupies one standard 45 mm module slot — a 12-way enclosure holds twelve of these side by side. Depth is 97 mm, height 97 mm.
Wiring and connections
Main circuit terminals are screw-type, M4 thread. Accepts 2× (1 to 2.5 mm²) or 2× (2.5 to 10 mm²) solid or stranded copper. That covers standard motor power wiring up to 10 mm² — enough for a 36 A rated load at 480 V or 600 V.