Four poles (4P) means it switches and protects all three phases plus the neutral, common for distribution boards where the neutral needs overcurrent protection.
Mounts on a backplate in any orientation — horizontal, vertical, or flat on the back. The 108 mm width, 137 mm height, and 80 mm depth fit standard distribution board cutouts. Front connections top and bottom with Everlink lugs accepting 2.5 to 95 mm² rigid or stranded aluminium/copper, or 2.5 to 70 mm² flexible copper. IP40 front face keeps tools and fingers out; IK07 impact resistance handles the odd dropped screwdriver during commissioning.
It's suitable for isolation per that standard, meaning you can rely on the visible break for lockout/tagout. Overvoltage category III suits fixed-installation distribution boards. No earth-leakage protection built in — that's handled separately if needed.