The 4-pole (4P) variant switches all three phases and the neutral — no separate neutral pole needed.
Width is 72 mm — that's 4 modular-width units (4 MW) on the rail. Mounting position is any — doesn't care if the rail is vertical or horizontal. Terminal touch protection is included, and the breaker is sealable for tamper-proof installations. Halogen-free and silicon-free construction, so no corrosive off-gassing in a sealed enclosure near sensitive electronics.
Thermal derating and environment
Rated 13 A at 30 °C ambient. Derates to 12.37 A at 40 °C, 11.96 A at 45 °C, and 11.36 A at 55 °C. If your panel runs warm — say 45 °C inside a packed enclosure — plan for that 1 A drop.