The 6 kA interrupting rating at 230/400 V is enough for most final subcircuits in a distribution board; it will clear a hard fault without the arc re-striking.
Single-pole format takes up one module width (roughly 18 mm), so it fits tightly in a crowded distribution board. The C-curve avoids nuisance tripping on moderate motor inrush or capacitive loads, but if you're feeding a high-inrush transformer or a long cable run, check the let-through energy coordination with the upstream breaker.