What this 250 A MCCB delivers
It carries a breaking capacity of 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V — so the interrupting rating drops sharply above 500 V, which matters when specifying for a 690 V distribution bus.
The breaker holds full 250 A rating from 40 °C through 50 °C, then derates to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. Dimensions are 248 mm high by 138 mm wide by 110 mm deep, which fits the standard SENTRON 3VA panel footprint. Maximum power loss is 37.5 W, so heat dissipation within the enclosure needs to be accounted for in the thermal design.