The Siemens 3VA1225-1AA32-0DH0 is a SENTRON 3VA1 switch disconnector in MCCB design — 3-pole, rated 250 A continuous, with no overload or short-circuit protection built in. It's a load-break switch for isolation and switching duty, not a circuit breaker. The 250 A rating holds flat from 40 °C to 50 °C; above that it derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C, so if your enclosure runs hot, factor that curve into the continuous current budget. The UVR drops the switch on loss of control voltage, which is standard for safety isolation schemes where you want the load disconnected if the control supply fails. The auxiliary contacts let a PLC or panel indicator confirm the switch position without climbing into the enclosure. Connection is busbar front-terminal, so it's designed for panel-mounted busbar systems — common in distribution boards where the bus runs across the front of the devices.
Footprint is 105 mm wide × 158 mm high × 70 mm deep — standard 3-pole MCCB form factor for the 3VA1 frame. Busbar connection on the front terminals means the bus runs across the device faces, not the sides. Mechanical service life is 15,000 switching cycles typical. Power loss is 57 W maximum at rated current. If you're switching DC loads, that 500 V ceiling is the limit.