The Siemens SENTRON 3VA2225-6HN32-0JL0 is a 3-pole molded case circuit breaker rated for 250 A continuous current at 40 °C, with a 242 kA interrupting capacity at 240 V — that is the short-circuit current it can safely clear without welding contacts or rupturing the case, which is the number that governs fault protection in a distribution panel. Ambient derating is baked in: the breaker holds 250 A up to 50 °C, then drops to 241 A at 55 °C and 213 A at 70 °C.
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard 3-pole MCCB footprint for a 250 A frame. Maximum power loss is 48 W at rated current — that heat has to be managed inside the enclosure. In a sealed panel with no fan, 48 W per breaker adds up; a cement plant's motor control center with a dozen of these needs either forced ventilation or a larger cabinet to stay below 55 °C where the derating curve starts.