It carries a 187 kA interrupting capacity at 240 V, dropping to 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V — the SCCR headroom is there for high-fault industrial service entrances or sub-distribution feeding motor control centers.
Ratings that drive the fit
Rated current holds at 50 A from 40 °C through 50 °C ambient (–), then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C (–). That flat top through 50 °C means no up-sizing for warm panel interiors — the breaker delivers its full nameplate in most North American and European enclosure conditions. Interrupting capacity at 240 V (187 kA) covers worst-case utility transformer secondary faults; the 17 kA floor at 500 V and 690 V still meets typical high-voltage distribution requirements. Power loss is 14.6 W maximum — relevant for thermal budgeting in sealed enclosures.
Built-in accessories
The basic switch is 3VA11505EF320AA0, meaning the core breaker mechanism is the same as the base 50 A frame.