The 3VA2163-5HL36-0BL0: The interrupting capacity is not a single number — it is a curve across system voltages: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The sharp drop at 690 V (3.7 kA) is typical for a 3-pole MCCB on a 690 V line — the arc-extinction challenge at that voltage limits the rating, so if your system runs 690 V, verify the available fault current is under that threshold.
The ETU320 trip unit is electronic, not thermal-magnetic, so the trip curve is programmable via the front interface — no heater elements to age, but the power loss is 6.5 W maximum, which adds to the enclosure's thermal budget.