Breaking capacity — the real-world number
The 3VA1120-4EF32-0AC0: The interrupting rating drops as system voltage climbs: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 480 V panel, you're looking at roughly the 440 V figure — 52.5 kA — which covers most industrial service entrances.
Thermal performance in a hot enclosure
Rated current holds flat at 20 A from 40 °C through 55 °C, then derates to 19 A at 60 °C and 65 °C, and stays at 19 A up to the 70 °C operating maximum.
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that drops into most SENTRON or third-party distribution boards. The 2 auxiliary switches (HQ design) are built in, so you get status feedback without adding external contact blocks. If you need remote trip or status over fieldbus, you'd add an external shunt trip or auxiliary module.