What this 3VA2040-5HL42-0AA0 actually is
The ETU320 is an adjustable electronic trip, so you set the overload and short-circuit thresholds to match the load, not the other way around. That's unusual for a thermal-magnetic breaker and saves a derating calculation on a warm panel day.
Breaking capacity — the real fault-handling story
At 240 V it interrupts 187 kA symmetrical. At 500 V it drops to 75.6 kA, and at 690 V it's 3 kA. That 690 V figure tells you this is a 480/600 V class breaker — it will clear a fault at 690 V, but the arc extinction is marginal. The adjustable trip range runs from 60 A minimum to 480 A maximum. That's a wide window — you can protect a 60 A feeder or a 480 A main bus, but the breaker's own continuous rating is 40 A, so the trip setting must be coordinated with the downstream conductor ampacity, not just the breaker's frame.
The 3VA2040-5HL42-0AA0 snaps onto a DIN rail.