It's a line-protection device — meaning it's configured for feeder and main breaker duty rather than motor branch-circuit protection.
This breaker carries 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 5.1 kA at 690 V. At 690 V the rating drops to 5.1 kA, so if you're on a 600 V or 690 V system, verify your available fault current is under that threshold.
Thermal derating — don't size by the 250 A label alone
At 55 °C it derates to 238 A, at 60 °C to 225 A, at 65 °C to 213 A, and at 70 °C to 200 A.
Dimensions are 105 mm wide, 181 mm high, and 86 mm deep — a standard 3-pole MCCB footprint that fits SENTRON 3VA2 mounting plates and busbar systems. The mechanical endurance is 20,000 operations — typical for a main breaker that cycles infrequently.