What this 4-pole MCB brings to a panel
That's enough for most building-distribution boards where the upstream device provides the back-up limitation. The 72 mm wide body (4 width units on a DIN rail) snaps into any standard 35 mm rail enclosure. Mounting position is unrestricted, so you can orient it vertically, horizontally, or flat — useful when you're squeezing a sub-distribution board into a tight utility closet.
Where it fits — and where it doesn't
The B-curve characteristic (3–5× In) is deliberately chosen for circuits where the load is mostly resistive or has a short inrush — think lighting, socket outlets, control transformers. If you're feeding motor starters or drives with a longer inrush, a C-curve (5–10× In) would be a better match to avoid nuisance trips. The 10 A rating limits this breaker to circuits drawing under about 2.3 kW per phase at 400 V three-phase, or 2.3 kW single-phase at 230 V. The neutral pole is switched, so you get full isolation on all four poles when the breaker is off — no floating neutral downstream. Storage range is wider at -40 to +75 °C. Overvoltage category 3 means it's rated for fixed-installation distribution boards, not for equipment-level protection.