The 250 A frame carries the full current at ambient temperatures up to 50 °C without derating; above that, the thermal curve steps down to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C — so if this breaker lives in a warm enclosure, the actual trip threshold shifts, and you size the load accordingly. Interrupting capacity is given at five voltage levels: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, 17 kA at 500 V, and 11.9 kA at 690 V. The 415 V figure is the one most panel builders will check first for 400 V three-phase distribution — 75.6 kA gives solid headroom for high-fault installations without cascading upstream. That means it drops the breaker on loss of control voltage, which is useful for safety circuits or coordinated shutdown sequences.
Dimensions are 70 mm depth, 140 mm width, 158 mm height. Width at 140 mm is the 4-pole footprint; verify the mounting base matches existing busbar or DIN-rail cutouts before ordering.