Interrupting ratings and thermal derating
The 3VA1080-2ED42-0HC0: The interrupting rating drops across the voltage range: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at both 500 V and 690 V. That means on a 400 V class system the breaker still clears 32 kA — enough for most distribution panels with a transformer upstream. The thermal current holds 80 A from 40 °C through 50 °C, then steps down: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C.
Dimensions are 130 mm height, 101.6 mm width, 70 mm depth — the 4-pole width is about 4 inches, which matches the standard SENTRON 3VA mounting footprint.