It's a line-protection device — meaning it sits upstream in a distribution panel, not on a motor starter — and its job is to clear faults fast without letting the arc travel past it. At 415 V it still holds 121 kA, and even at 500 V it manages 75.6 kA. The ETU320 is an electronic trip unit, so it gives you adjustable thermal and magnetic curves — not just a fixed bimetal. That matters for coordination: you can dial in the long-time pickup and short-time delay to ride through inrush without nuisance tripping, then let the instantaneous element catch a hard short.
If you need those auxiliaries, you're looking at a different order code in the 3VA2 family.