The 10 kA breaking capacity at 400 V AC (per EN 60898) tells you this MCB can safely interrupt a fault current up to 10,000 A — typical for a sub-distribution board fed from a 200–400 kVA transformer with short cable runs. The 3P+N design switches all three phases and the neutral, so it's a drop-in for a 3-phase + N distribution board where you need to isolate the neutral for maintenance or downstream RCD coordination. The C-curve avoids trips on the magnetizing inrush of a 4–5 kVA control transformer or a bank of LED drivers.
Accepts solid conductors up to 25 mm², so it can be fed from a 25 A subfeed or a 16 A radial circuit without a separate terminal block. The neutral conductor switching means the N pole disconnects with the phases, which is required in some regional wiring codes (e.g., UK 17th/18th Edition) for final circuits. That covers unheated plant rooms, outdoor enclosures in temperate climates, and hot roof-top switchgear.