What the 250 A rating means for your panel
That 250 A holds at 40 °C, 45 °C, and 50 °C without derating; at 55 °C it drops to 243 A, at 60 °C to 237 A, at 65 °C to 230 A, and at 70 °C to 223 A — so if your enclosure runs hot, the actual continuous current capacity is lower than the nameplate.
The interrupting rating varies significantly with system voltage: 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. For a 480 V panel (common in North America), the relevant figure is the 440 V or 500 V value — 52.5 kA or 17 kA respectively — so verify your available fault current against the correct voltage column.
Physical fit and auxiliary options
This is a panel-mount MCCB, not a DIN-rail unit — plan for bolt-on busbar connections and a cutout in the mounting plate. A voltage trigger is present; undervoltage release is not included. The trip indicator is mechanical, visible on the front face.