It carries a breaking capacity of 121 kA at 240 V AC, with the curve stepping down to 75.6 kA at 415 V and 52.5 kA at 440 V — sufficient selectivity headroom for most secondary distribution applications.
Current ratings and thermal derating
Above that, it derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C.
Breaking capacity by voltage
At 415 V it still delivers 75.6 kA; at 440 V it drops to 52.5 kA; at 500 V and 690 V it holds at 11.9 kA.
The 3-pole width of 76.2 mm (3 inches) is the standard MCCB footprint for a 3-pole frame at this rating — it drops into a panel that was laid out for a similar SENTRON 3VA frame without re-drilling the mounting plate.