What this 1.6 A C-curve MCB is and where it fits
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. The 18 mm width (1 modular unit) and 76 mm depth let it snap onto a standard DIN rail in any mounting position, with a quick-assembly fastening system that speeds panel build. The C-curve means the magnetic trip threshold is 5 to 10 times rated current — suited for moderate inrush loads like small transformers, contactor coils, or LED drivers. 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).
What the ratings mean for fit
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. Energy limitation class 3 indicates it limits let-through energy to a level that protects downstream equipment in most residential and light commercial panels. IP20 with connected conductors means the breaker is touch-safe only when wired — suitable for enclosed distribution boards, not for wet or dusty environments. The combined terminal top and bottom accept both busbar and cable connections, and the sealable design allows lockout-tagout compliance.