The 6 kA breaking capacity per EN 60898 (and IEC 60947-2) tells you it can safely interrupt a fault up to that level at 400 V AC; if your available fault current on the secondary side of the transformer is higher, you need to coordinate upstream or step up to a 10 kA rated unit. At 25 A and 400 V AC, each pole dissipates about 2.7 W in hot operating state — that's the heat you need to account for when filling a DIN-rail enclosure. Two poles means 5.4 W total inside the panel. The 2-module width (36 mm) is standard for a 2-pole MCB in this family, so it slots right into a pre-configured SENTRON distribution board without extra spacing.
The part carries IP20 protection with connected conductors — typical for a panel-mounted breaker where the enclosure provides the real ingress barrier. It's sealable (you can lock the toggle with a padlock for lockout/tagout) and halogen-free / silicon-free, which matters for installations with sensitive contacts or where outgassing during a fault could cause corrosion.
The 2-pole design switches both phase conductors simultaneously, which is what you need for a 2-wire single-phase or split-phase feed.