The 25 kA Icn (rated short-circuit breaking capacity per IEC 60898) is the service breaking capacity for general distribution; the 50 kA Icu (ultimate breaking capacity per IEC 60947-2) is the maximum fault it can clear once and still be functional afterward. Rated insulation voltage of 690 V and overvoltage category IV mean this breaker is rated for the line side of the installation — at the service entrance or main distribution board — not just downstream subpanels. Overvoltage category IV is the highest within the IEC 60947-2 framework, covering equipment connected to the utility supply point. That makes this part suitable for main incoming feeders in 400/690 V industrial networks.
Dimensions are 54 mm wide (2-pole width, 2 x 18 mm per pole), 95 mm tall, 82.5 mm deep. The 82.5 mm depth includes the breaker body and the screw terminals — account for that when laying out the enclosure depth, especially in shallow wall-mount boxes. IP20 finger-safe terminals mean the front face is touch-safe once installed, but the breaker is not sealed against dust or moisture; it belongs inside a panel with a door.