At 415/440 V the rating drops to 121 kA, still well above typical secondary-side fault levels.
Breaking capacity across voltages
The interrupting curve is what you check first when back-feeding a 480 V panel: at 500 V it holds 75.6 kA, and at 690 V it falls to 3.7 kA — that 690 V figure is the weak point, so if your system runs 690 V three-phase, this breaker is not the right choice for high-fault locations.
No undervoltage release, no ground-fault module, no communication function — this is a straight line-protection device meant for fixed-trip applications where you don't need shunt-trip or remote reset.
