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. The 11.9 kA at 690 V still clears a fault on 600 V class gear, but you'd want to verify it against your transformer's prospective short-circuit current.
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. That's a shallow derating curve — useful if the breaker sits in a crowded panel or near a heat source. The 12 W maximum power loss at full load is manageable for enclosure thermal calculations. Storage range spans -40 °C to 80 °C, so it handles warehouse or truck-bed temps without issue.
Panel fit and integration
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. No undervoltage release, no ground-fault monitoring, no communication module — this is a plain line-protection breaker, not a smart device. If you need remote trip or status over fieldbus, you'd add an external shunt trip or auxiliary module.