The Siemens SENTRON 5SU9356-1KN16 is a combined RCD and miniature circuit breaker (RCBO) — one device that provides both overcurrent protection and residual current (earth leakage) protection in a single 2-module-width package. The C-curve and 30 mA sensitivity make it a common choice for final circuits supplying socket outlets, lighting, or small appliances where both overcurrent and shock protection are required in one DIN-rail unit.
The IP20 rating applies once installed in a distribution board with conductors connected — handle and store with the board closed.
Thermal derating — what the ratings mean in a panel
At 40 °C the continuous current must be derated to 15.04 A, at 45 °C to 14.56 A, at 50 °C to 13.92 A, and at 55 °C to 12.96 A.
Compliance and approvals
Designed to EN 60898 (breaking capacity 6 kA), pollution degree 2, overvoltage category III, surge voltage resistance 4 000 V. Halogen-free and silicon-free construction. Functional marking per EN 61346-2 and IEC 81346-2: letter F.