It is a 3-pole unit rated 16 A continuously at 40 °C, with a thermal-magnetic trip curve suited to feeder and branch-circuit duty. At 415 V the rating drops to 121 kA, and at 690 V it holds at 17 kA, so the application voltage governs which interrupting number you design to.
The breaker holds its full 16 A rating from 40 °C up to 55 °C ambient inside the enclosure. At 60 °C it derates to 15 A, and at 70 °C it is still at 15 A — no steep cliff, so a warm panel does not force an oversize frame. The footprint is 130 mm tall, 76.2 mm wide, and 70 mm deep, which fits standard 3-pole MCCB mounting patterns.