Breaking capacity and temperature derating
The interrupting rating drops as voltage rises: 154 kA at 415 V, 121 kA at 440 V, and 17 kA at 500 V and 690 V. That means on a 400 V system you still have headroom for most industrial fault levels. The continuous current holds steady at 16 A from 40 °C up to 55 °C, then derates to 15 A at 60 °C and 65 °C, and stays at 15 A through 70 °C. So if you're mounting this in a warm enclosure near motor drives, you lose only 1 A above 55 °C — not a showstopper for a 16 A feeder.
The shunt trip adds a couple of control wires, but the overall depth stays at 70 mm, which is tight enough for shallow enclosures.