The breaking capacity at 240 V is 242 kA, at 415 V it is 187 kA, and at 690 V it drops to 4 kA — so on a 400 V class panel this breaker handles high fault currents typical of transformer-fed distribution.
The breaker is rated 100 A from 40 °C through 50 °C; above that it derates linearly to 85 A at 70 °C. In a closed panel with ambient near 55 °C, expect 96.25 A continuous — so a 100 A feeder should be loaded to about 96 A if the panel runs warm. Mounting is screw-fixed to a backplate or DIN rail adapter; the depth leaves clearance for rear-access busbars in a typical 600 mm deep enclosure.
What the ETU350 release and undervoltage release mean for coordination
The breaker does not include a voltage trigger, phase failure detection, or communication function — it is a standalone protective device, not a smart breaker.