The 10 kA breaking capacity — confirmed under both EN 60898 and IEC 60947-2 — means it can safely interrupt a fault current up to 10 000 A without welding contacts or cascading failure upstream. That 10 kA rating at 400 V AC covers most utility-side fault levels in European-style distribution boards. The IP20 rating applies with connected conductors — normal for a panelboard interior; no special sealing is needed inside a closed enclosure.
Power loss is 2.5 W per pole in hot operating state at rated current, so a 3-pole unit dissipates 7.5 W total. In a densely populated enclosure, that heat needs to be considered for thermal derating of adjacent devices.