Its TM240 thermal-magnetic release provides overload and short-circuit protection for feeder circuits, with a rated current of 250 A at 40 °C ambient — the same rating holds at 45 °C and 50 °C, then derates to 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C. The 187 kA breaking capacity at 240 V AC means it can safely interrupt fault currents up to that level without upstream cascading; per the datasheet, the interrupting rating drops to 121 kA at 415 V, 75.6 kA at 440 V, 30 kA at 500 V, and 17 kA at 690 V.
The maximum power loss of 57 W is the heat dissipated at full rated current; panel ventilation or spacing should account for this to keep the ambient within the 70 °C operating maximum. This is a straightforward, rugged breaker for standard feeder protection where selectivity coordination is done via the trip curve.