Rated breaking capacity hits 20 kA per IEC 60947-2, with a secondary 5 kA rating under UL 1077 and CSA C22.2 No.235 — so it covers both IEC and North American panel specs on the same unit.
That's the right choice for motor feeders, solenoid banks, or DC power supplies where the start-up surge is short but heavy — a C-curve (5–10× In) would nuisance-trip on the same load. The 20 kA IEC 60947-2 rating tells you this breaker can safely interrupt a fault up to 20,000 A at 400 V AC without welding contacts or venting arc. That's enough for most distribution boards downstream of a 630 kVA transformer; if your panel SCCR is higher, you'll need upstream current-limiting fuses or a higher-rated breaker.
At 18 mm wide (1 MW per DIN 43880), this snaps onto standard DIN rail — one modular unit. Mounting position is any, which helps in tight gland-plate layouts. Ambient range is -40 to 75 °C, with humidity derating above 55 °C (95% RH at 55 °C, down to 35% at 75 °C). IP20 with conductors connected — fine inside a panel, not for wet or outdoor locations without a weatherproof enclosure.