The interrupting capacity hits 330 kA at 240 V and stays strong at 242 kA up through 440 V, dropping to 187 kA at 500 V and 3.7 kA at 690 V. That's enough fault current for most industrial service-entrance and distribution panels.
That matters when this breaker sits in a crowded enclosure next to drives or transformers that push ambient air well past 40 °C. The interrupting capacities are given at specific voltages: at 240 V it clears 330 kA, at 415/440 V it clears 242 kA, at 500 V it clears 187 kA, and at 690 V it clears 3.7 kA. That 3.7 kA figure at 690 V is the weak point — if your system runs 690 V with available fault current above that, you need a different frame. For standard 480 V distribution the 187 kA is more than adequate behind a transformer.
The 105 mm width (4.13 in) is the standard 3-pole MCCB footprint for this SENTRON frame — it fits the same panel cutout and DIN-rail adapter as other 3VA2 units. The 86 mm depth (3.39 in) leaves room for rear-connection terminals and cable bending radius inside the enclosure.