The Siemens SENTRON 5SN4106-6CN is a 1-pole miniature circuit breaker with B tripping characteristic, rated 6 A and a breaking capacity of 10 kA per EN 60898 at 230/400 V AC.
At 6 A it protects a branch circuit up to that continuous current; the 10 kA breaking capacity per EN 60898 means it can safely interrupt a fault current up to 10,000 A at the rated voltage, which covers the majority of domestic and light commercial installations where the prospective short-circuit current stays under that level. Single-phase operation is rated at 250 V AC; multi-phase (line-to-line) at 440 V AC. The 50/60 Hz frequency range covers both common mains frequencies without derating. Power dissipation is 1.1 W per pole in hot operating state at rated current — negligible for thermal coordination in a crowded enclosure, but worth summing when 20+ breakers share a panel.