The 25 A rating holds at 30 °C ambient; at 40 °C it derates to 23.68 A, at 45 °C to 23 A, and at 55 °C to 21.54 A. If your panel runs warm — say, tightly packed with other breakers — the effective continuous current is lower than the label. Breaking capacity of 10 kA per EN 60898 and IEC 60947-2 at 400 V AC means this breaker can safely interrupt a fault up to 10 kA without welding contacts or venting plasma. That covers the prospective short-circuit current of most final sub-circuits in a building installation. The overvoltage category is III (distribution level), pollution degree 2 (normal factory/office environment).
Rated for residential buildings and infrastructure per the manufacturer's suitability listing.