What this RCBO is and what the ratings mean
The Siemens 5SU9356-1KK32 is a SENTRON RCBO — a combined residual-current device and miniature circuit breaker in one 2-module-wide (36 mm) package. It protects a single-phase final circuit against both overload/short-circuit and earth leakage. The 32 A C-curve trips between 5× and 10× rated current, so it handles motor-starting inrush on pumps or small compressors without nuisance tripping, while still clearing a hard fault fast. The 30 mA Type AC residual-current element catches sinusoidal AC earth faults — the standard choice for general-purpose socket circuits and lighting where no DC fault content is expected.
Panel-fit details
Two modular-width units (36 mm wide) snap onto standard DIN rail. Depth is 77 mm (70 mm installation depth behind the panel face), which fits most domestic and light-industrial enclosures. IP20 when installed in a distribution board with conductors connected — so it is not a standalone outdoor device. Mounting position is any; supply can enter from top or bottom. Halogen-free and silicon-free construction, which matters for clean-room or sensitive-environment specs.