The Siemens 5SL6115-7CC is a SENTRON miniature circuit breaker — one pole, C-curve, rated 1.6 A with a 6 kA breaking capacity per EN 60898.
Breaking capacity of 6 kA at 400 V AC per EN 60898 means this breaker can safely interrupt a fault current up to 6,000 A — typical for a residential or light-commercial panel where the prospective short-circuit current stays under that threshold. If your site's available fault current exceeds 6 kA, you need a higher-rated breaker (like the 10 kA 5SL4363-7) or a current-limiting upstream device. Single-pole design (1P) with a rated voltage of 250 V AC single-phase or 400/440 V AC multi-phase. That covers most 230/400 V distribution networks. The 1.6 A rating is on the low end — sized for small loads like control transformers, indicator lamps, or fractional-horsepower motors. Power loss is 1.3 W per pole in hot operating state at rated current — negligible for thermal management in a crowded enclosure, but worth noting if you're packing many breakers side by side at full load.
Sealable — you can lock the toggle in the OFF position with a padlock hasp, which is useful for lockout/tagout on a dedicated circuit.