Breaking capacity that decides the fault duty
At 240 V it interrupts 187 kA; at 415 V and 440 V it still holds 121 kA; at 500 V it drops to 75.6 kA; and at 690 V it is rated 3 kA. For a 480 V distribution panel (common in North American industrial plants) the 75.6 kA at 500 V gives you headroom above the typical 65 kA SCCR requirement — useful when the transformer is oversized or the utility fault current is high.
Built-in auxiliary switch and shunt trip
That means you get remote status indication (open/closed/tripped) and a remote-trip input without adding external relays or drilling the cover for aftermarket accessories. The shunt trip is useful for emergency-off circuits or interlocking with a downstream VFD or PLC safety output.
Maximum power loss is 5.4 W. In a multi-breaker panel, that is low enough that you do not need forced ventilation for thermal management — natural convection through the enclosure vents handles it, provided the ambient stays under 70 °C.