It's part of the SIRIUS brand family, built for industrial control panels. It also includes phase failure detection, so a lost phase won't cook the winding.
Mounting position is any orientation, so no worries about vertical vs horizontal in a tight cabinet. Clearance: 20 mm above and below, 9 mm to the side, zero front and back. Terminals are M3 screw-type for the main circuit, accepting 2× (0.5...1.5 mm²) or 2× (0.75...2.5 mm²) solid or stranded. That's standard for a motor feeder up to a few kW.
