The Siemens 3VA1225-1AA32-0AD0 is a SENTRON switch disconnector in an MCCB-style housing — 3-pole, rated 250 A continuous, with no overload or short-circuit protection built in. That makes it a pure isolation and switching device for a circuit that's already protected upstream or by a separate breaker. It's meant for applications where you need a visible air gap and a load-break rated switch, not a full molded-case breaker. The 250 A rating holds flat from 40 °C through 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. The mechanical service life is 15,000 operating cycles, typical for this class of disconnect.
The main circuit connection is busbar, front terminal arrangement, so it's designed for busbar-stacked panels where you run the main feed horizontally and tap off vertically. No undervoltage release, no voltage trip, no communication module — it's a straightforward disconnect with aux contacts for remote position monitoring.