Its breaking capacity reaches 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 4.5 kA at 690 V — the sharp drop at 690 V confirms this breaker is optimized for low-voltage distribution up to 500 V, not 690 V main feeds.
Thermal derating — the real-world current limit
While the breaker is rated 250 A continuous, that holds only up to 50 °C ambient. At 55 °C it derates to 241 A, at 60 °C to 232 A, at 65 °C to 222 A, and at 70 °C to 213 A. Account for that in your thermal budget if the breaker is in a sealed low-voltage switchboard.
Three-pole construction with line-protection trip curve. The 250 A continuous rating and the 375 A minimum fault-current threshold define the range the breaker clears within its trip characteristic.