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. If your panel ambient runs above 50 °C, the continuous load needs to stay under the derated curve.
Mounting and integration
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. Rated insulation voltage is 800 V. Maximum power loss is 19.2 W, so factor that into the enclosure thermal budget if the panel is tightly packed. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.