At 415 VAC the 3VA1080-4ED42-0KH0 interrupts 75.6 kA; at 440 VAC it's 52.5 kA; at 500 V and 690 V it holds at 11.9 kA (–). That steep drop above 440 V is typical for a compact-frame MCCB — the arc extinction energy scales with voltage.
Thermal derating — don't assume 80 A at every panel temp
At 55 °C it drops to 78 A; at 65 °C to 75 A; at 70 °C to 74 A (–). If this breaker sits next to a transformer or drive in a sealed enclosure, use the 70 °C column — that 74 A continuous limit is the real-world figure for the BOM.
The 101.6 mm width (4 inches) means it occupies four 25 mm DIN-module positions. Maximum power loss is 19.2 W — account for that in the enclosure thermal budget, especially when grouping multiple breakers.