It carries a DC breaking capacity of 15 kA per IEC 60947-2, which is the figure to use when specifying for DC circuits — the EN rating is the lower bound for AC applications. The C-curve (5-10x In) means it's the standard choice for protecting general-purpose loads like lighting, control transformers, and small motor circuits where moderate inrush is expected.
At 18 mm width (1 modular unit), it fits standard distribution boards and sub-panels. The combined terminal at top and bottom accepts both busbar and conductor connections, and the sealable design allows the panel builder to lock the setting against unauthorised changes.