The Siemens 3VA1110-4ED12-0AA0 is a 1-pole SENTRON molded case circuit breaker (MCCB) with a TM210 thermal-magnetic overcurrent release, rated 100 A continuous at 40 °C and delivering 75.6 kA interrupting capacity at 240 V AC — enough to handle high-fault utility feeds in a 25.4 mm wide package that snaps onto a standard DIN rail inside a panel.
The 100 A rating holds flat from 40 °C through 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C — so in a warm enclosure you lose less than 10 % of capacity even at the upper operating limit. Breaking capacity is 75.6 kA at 240 V AC, dropping to 9 kA at 415 V AC — the 415 V figure is what governs for three-phase line-side protection in a 400 V panel; the 240 V number matters for single-phase high-fault service entrances.
Width is 25.4 mm (one standard 1-inch module) and depth is 70 mm — it occupies a single DIN-rail slot, leaving room for adjacent breakers or auxiliaries in a multi-pole ganged assembly. Front face is IP40 rated — fine for a closed cabinet, not for washdown environments.