The breaking capacity is 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 11.9 kA at both 500 V and 690 V — that range covers most industrial low-voltage distribution grids. At 40 A continuous it doesn't derate until 55 °C (39 A at 55 °C, 38 A at 65 °C, 37 A at 70 °C), so it holds rating in a warm panel up to about 50 °C ambient.
The 70 mm depth leaves room behind a 200 mm deep enclosure door for wiring and the auxiliary switch block. That means you can wire remote status indication — open/closed, tripped — without adding an external accessory block. Power loss is 13.3 W maximum, so ventilation in a sealed panel is worth checking if you're stacking several breakers.