Breaking capacity is the headline number here: 220 kA at 240 V AC, 154 kA at 415/440 V, 121 kA at 500 V, and 17 kA at 690 V.
Continuous current is 400 A flat from 40 °C through 50 °C, then derates to 392 A at 55 °C, 384 A at 60 °C, 376 A at 65 °C, and 367 A at 70 °C. If your panel ambient runs 55 °C or higher, the 400 A label doesn't hold — size the load at the derated figure or move to a higher-frame breaker. In a sealed panel with multiple breakers, that thermal load adds up; factor it into the cabinet cooling calculation or you'll cook the trip unit. The storage range is wider because there's no current flowing — that's the handling and warehouse limit, not the running limit.
This breaker is current production.
The 110 mm depth means it projects less than many older frames, which helps in shallow enclosures.