Siemens 3VA1080-3ED42-0DH0 — 80 A SENTRON MCCB with Undervoltage Release
Its interrupting capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, with a 7.5 kA floor at 500 V and 690 V — so it handles high-fault utility feeds or transformer secondaries where the available short-circuit current is substantial. Power loss maxes at 21.7 W, manageable in a standard enclosure without forced cooling.
The 80 A rating holds steady from 40 °C through 50 °C (–), then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C (–). That flat thermal curve means you don't lose headroom until the ambient inside the enclosure passes 50 °C — useful for a crowded panel or a sunny roof location. A trip indicator is present, so a quick visual scan tells you which breaker opened without pulling the cover.
Integrated undervoltage release and auxiliary switch complement
That 101.6 mm (4 in) width is a standard MCCB footprint for 4-pole breakers in this class — it fits the usual DIN-rail or panel-mount cutout without surprises. The 70 mm depth (2.76 in) leaves room for rear busbar connections in a typical distribution cabinet.