The breaking capacity is 220 kA at 240 V AC, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V — so the interrupting rating depends heavily on the system voltage you are working with. At 690 V, 17 kA is still a strong figure for an MCCB of this frame size, but it is not the 220 kA you get at 240 V; selectivity studies need to use the voltage-specific value.
At 55 °C it derates to 158 A, at 60 °C to 155 A, at 65 °C to 153 A, and at 70 °C to 150 A. That is a shallow derating curve — only 10 A lost over a 30 °C rise — so in a warm panel or outdoor enclosure the breaker still carries nearly its full nameplate.
That 76.2 mm width is a standard 3-inch footprint for a 3-pole MCCB in this class — it matches the mounting hole pattern and bus-bar spacing of the SENTRON 3VA family. The unit includes an undervoltage release but no auxiliary contact, no communication function, and no ground-fault monitoring. If you need remote status or shunt-trip capability, you add the accessory separately.