The Siemens SENTRON 3VA1225-6EF32-0HA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous at 40 °C, with a TM240 thermal-magnetic release and an integral shunt trip (STL) for remote tripping. The 250 A rating holds flat through 50 °C; above that it derates gradually to 223 A at 70 °C, so if your panel runs hot, size the load against the 70 °C column, not the nameplate.
The 3VA1225-6EF32-0HA0 measures 105 mm wide by 158 mm tall by 70 mm deep — a standard SENTRON 3VA frame that bolts into a panel or mounts on a mounting plate. The 105 mm width for a 3-pole 250 A MCCB is compact enough to fit alongside other feeders in a multi-breaker lineup. No undervoltage release is fitted, but the shunt trip (STL) gives you a remote trip coil for emergency-stop or PLC-based shutdown circuits.