The interrupting capacity hits 330 kA at 240 V, 242 kA at 415 V, and still 3.7 kA at 690 V, so it handles serious fault current without cascading upstream. A lot of breakers start shedding amps above 40 °C, but this one holds 100 A right through 70 °C. Means you can size it tight to the motor FLA without leaving a safety margin for panel heat — one less thing to recalc when the line gets hot.
Motor protection design and auxiliary hardware
This breaker is designed as a motor protection device, meaning its trip curve and thermal memory are tuned for starting inrush and running overload on induction motors. It includes phase failure detection — so if you lose a leg on a 3-phase motor, it trips before the winding cooks. That UVR is a common safety requirement: if control voltage drops, the breaker opens, preventing an automatic restart.