Two breaking-capacity ratings let you place this RCBO in different network positions. Per EN 60898 (domestic / light commercial) it is rated 6 kA — fine for a sub-distribution board or final circuit. Per IEC 60947-2 (industrial) it carries 15 kA, which gives headroom for a main distribution panel with a larger upstream transformer. The energy limitation class is 3, so it lets through less let-through energy than a class-1 or class-2 device, making downstream coordination easier.
Thermal derating — the real-world current
The 13 A rating holds only at 30 °C. At 40 °C it derates to 12.48 A; at 50 °C to 11.96 A; at 60 °C to 11.31 A; at 70 °C to 10.01 A. If the panel ambient runs warm — say 50 °C inside a sealed enclosure — the usable current is 11.96 A, not 13 A.