The 100 kA SCCR at 400 V (and also at 240 V and 500 V) tells you this breaker can safely interrupt a fault current up to 100 kA at those voltages, which covers most industrial distribution panels without needing upstream fuses to reduce the available fault current. At 690 V the SCCR drops to 4 kA, so if your line voltage is 690 V, verify the panel's available fault current is below that. Ground fault detection is not included, so if you need GF protection, add an external module or a separate GF breaker.
DIN rail footprint and clearances
Width is 45 mm, depth 97 mm, height 106 mm. For heat dissipation and access, allow 50 mm upwards, 50 mm downwards, 30 mm at the side. Zero clearance needed forwards or backwards. The 97 mm depth means it protrudes about 10 mm more than a typical miniature breaker; check gland-plate depth if the panel is shallow.