The 50 kA Icu at 220...440 V AC (conforming to IEC 60947-2) is the maximum fault current it can safely interrupt once; the same 50 kA Ics rating means it can clear that fault and be reclosed without maintenance, which matters for service-entrance or feeder duty where a fault is rare but must not force a breaker swap. At 690 V the Icu drops to 42 kA — still substantial for 690 V distribution. The 4-pole (4P) design with neutral on the right handles three-phase plus neutral distribution. Rear vertical/horizontal connection pitch is 115 mm without spreader, so panel buswork or cable lugs need to match that spacing. IP40 enclosure protection means it is suitable for indoor switchboards — not washdown or outdoor exposure. Pollution degree 4 per IEC 60664-1 is the most severe industrial pollution class (conductive dust or wet conditions inside the enclosure), so this breaker is built for harsh environments inside a panel.
Deployment context
Fixed-mount on a base plate — this is a drawout-style breaker for switchboard or MCC installation, not a DIN-rail unit. The 537 mm width, 352 mm height, and 297 mm depth define the cutout and enclosure space; plan for rear connection access.