Short-circuit ratings that matter for coordination
At 240 V it's rated 187 kA — that's a very high figure, typical for a main or large feeder breaker. At 415 V it's 121 kA, at 440 V it's 75.6 kA, and at 500 V and 690 V it drops to 17 kA.
Thermal derating — don't ignore the fine print
At 55 °C it derates to 39 A, at 65 °C to 38 A, and at 70 °C to 37 A.
It also has two HQ auxiliary switches, which are the high-quantity (2 x changeover) contacts for remote indication. No ground-fault monitoring is included, so if you need GF protection you'll need an external module or a different variant. The basic switch version is 3VA11405EF320AA0, meaning the trip unit is fixed thermal-magnetic, not electronic.
The 70 mm depth means it fits in shallow enclosures where a deeper breaker might hit the door or gland plate. Power loss is 13.3 W maximum, so heat dissipation inside a sealed cabinet is manageable but not trivial if you have several breakers ganged together.