The 55 mm width takes one slot; depth is 149 mm, so check your gland plate clearance if the panel is shallow. Any mounting position is allowed, and the IP20 front means it's fine inside a closed cabinet but not for a washdown zone. Solid conductors up to 2x 16 mm² or stranded up to 2x 25 mm² (with a single up to 35 mm²) — that covers most motor feeder cables up to the 16 A rating. The box terminals give a solid clamp for high-vibration environments like a conveyor drive.
Protection features and ratings
No ground-fault detection on this unit; that's a separate module if your circuit needs it. Breaking capacity varies with line voltage: 100 kA at 240 V AC, 50 kA at 400 V AC, 12 kA at 500 V AC, and 5 kA at 690 V AC. The 6 kV surge voltage resistance (impulse withstand) covers the standard transient environment in an industrial panel. Power dissipation is 14.5 W total in hot operating state, or 4.8 W per pole. That's moderate — you won't need forced cooling in a typical enclosure, but don't pack it tight against heat-sensitive components.