This is the current it'll hold all day in a 40 °C panel — no derating needed at that ambient. The TM240 thermal-magnetic release handles overloads and short-circuits; the built-in undervoltage release (UVR) trips the breaker if control voltage drops, which is standard for motor feeder disconnects and emergency-stop chains.
Breaking capacity — what it means for fault duty
This MCCB interrupts 121 kA at 240 V AC, 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 121 kA at 240 V is typical for North American 120/240 V split-phase service entrances; the 75.6 kA at 415 V covers most European 400 V industrial distribution.
The breaker holds 250 A continuously from 40 °C up through 50 °C. Above that, it derates: 243 A at 55 °C, 237 A at 60 °C, 230 A at 65 °C, and 223 A at 70 °C.
The 70 mm depth means it clears most shallow enclosures. The TM240 release is fixed-trip, not adjustable, so the overload curve is set at the factory.