Its breaking capacity scales with system voltage: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 52.5 kA at 690 V — so the same frame covers everything from a 240 V service entrance to a 690 V motor control center without a different breaker. The 250 A rating holds from 40 °C through 50 °C ambient; above that it derates linearly to 200 A at 70 °C, which matters if the breaker sits in a hot enclosure or next to other heat sources. This is a line-protection design (not motor-protection), so the trip curve is set for cable and busbar protection.
The 86 mm depth (3.39 in) is the dimension to check against gland-plate clearance in shallow cabinets.