Its rated continuous current Iu is 50 A, and it holds that rating from 40 °C up to 50 °C — only above 55 °C does it start to derate, dropping to 48 A at 55 °C and 45 A at 70 °C. The interrupting ratings are where this part differentiates itself: 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and still 7.5 kA at 690 V. That 75.6 kA figure at 240 V is unusually high for a 50 A frame — it tells you this breaker is designed for high-fault-capacity downstream of a large transformer or in a low-voltage main distribution board where fault currents can exceed 65 kA.
Release and accessories — what's inside the frame
The auxiliary contact version fitted is 2 auxiliary switches HQ, and the integrated auxiliary trip is order code 3VA9608-0BB11. No communication function, no phase failure detection, no ground fault monitoring. This is a straight line-protection breaker, not a multifunction power monitor.