What the breaking capacities mean for your panel
At 690 V the capacity drops to 3.75 kA, which still covers most industrial motor feeders on a 690 V bus. The 4-pole (3 phases + neutral) construction suits TN or TT systems where neutral protection is required. Above 50 °C it derates linearly: 24.0625 A at 55 °C, 23.125 A at 60 °C, 22.1875 A at 65 °C, and 21.25 A at 70 °C. If your panel internal temperature exceeds 50 °C, size the load accordingly — the thermal curve is already in the spec. The overcurrent release is an ETU330 electronic trip unit (adjustable LSI curves). The breaker also integrates an undervoltage release with leading NO contacts, part number 3VA9908-0BC24, and a ground-fault monitoring function using summation current on L+N.
Front protection is IP40; the enclosure should be rated for the environment. Maximum power loss is 1 W.