The 3VA1063-4ED42-0AH0 is a 4-pole SENTRON molded case circuit breaker rated 63 A continuous current at 40 °C, with a TM210 thermal-magnetic release. Interrupting capacity hits 121 kA at 240 V, 75.6 kA at 415 V, and 52.5 kA at 440 V — those numbers tell you it's sized for high-fault industrial panels, not light commercial. Front IP40 means it's fine inside a clean enclosure; don't mount it exposed to washdown.
Derating curve — the real ampacity
At 55 °C it derates to 60.48 A, at 60 °C to 59.22 A, at 65 °C to 57.96 A, and at 70 °C to 56.7 A.
Panel fit — dimensions and wiring
Four poles in a 100 mm footprint — that's a standard MCCB slot on most DIN-rail or panel-mount backplates. The auxiliary contact block (2 NO/NC + 1 trip alarm) is factory-integrated, so you don't lose a side-mount slot. Wire it for line protection only; no N-conductor protection built in, no phase-failure detection.