It carries a 121 kA interrupting rating at 240 V AC — enough to handle high-fault utility feeds without cascading upstream — and still delivers 75.6 kA at 415 V AC, 52.5 kA at 440 V AC, and 11.9 kA at 500 or 690 V AC.
Thermal derating and continuous current
Above that it steps down: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If your panel ambient runs 60 °C, you lose only 3 A — about 4% — which is better than many MCCBs in this frame size.
Built-in auxiliary and undervoltage release
It also includes two HQ auxiliary switches for remote status indication (open/closed/tripped). No ground-fault monitoring module is included; this is a straight line-protection breaker.
The 76.2 mm width (3 inches) is standard for a 3-pole MCCB in this frame class — it fits the same mounting footprint as other SENTRON 3VA breakers, so swapping between ratings in the same panel is a direct mechanical exchange without drilling new holes or moving the DIN rail.