The Siemens 5SY5115-7KK11 is a 1-pole miniature circuit breaker from the SENTRON family, rated 1.6 A with a C tripping characteristic and a 10 kA breaking capacity per EN 60898. It is designed for universal current operation — AC or DC — making it a fit for both standard lighting and control circuits and DC rail applications where polarity must be observed on the supply cord. At 1.6 A, this breaker protects a branch circuit drawing up to that current continuously at 35 °C; above that ambient, the thermal derating table applies (1.52 A at 40 °C, 1.44 A at 50 °C, 1.36 A at 60 °C).
The 10 kA breaking capacity at 230/400 V AC per EN 60898 and 10 kA at DC per EN 60898-2 means this breaker can safely interrupt a fault current up to that level without welding its contacts or cascading failure upstream.