It's rated for 400 V AC and 60 V DC, with a breaking capacity of 10 kA per EN 60898 and 20 kA per IEC 60947-2 — the higher IEC figure gives you headroom for fault-current coordination downstream of a transformer or in an industrial panel where the prospective short-circuit current exceeds the domestic standard.
If your line feeds a contactor coil bank or a bank of LED drivers with capacitive input, this is the curve that stays in. At 400 V AC, that covers most industrial distribution boards. The UL 1077 rating at 5 kA is supplementary protection for North American panels; it's not a branch-circuit rated breaker under UL 489, so know your local code.