What this combination unit does
The Siemens 5SU1153-0KV13 is a combined residual-current device and miniature circuit breaker (RCD/MCB) in one module — a single-pole+N unit with a Type AC residual-current trip set at 10 mA and a B-curve overcurrent release rated 13 A.
The 70 mm module width (4.5 DIN-rail pitch) slots into a standard distribution board alongside other Siemens 5SU-series devices. The 1+N-pole topology switches the line conductor only and provides a switched neutral — common in TN-S and TT earthing schemes. The 10 mA sensitivity is tighter than the standard 30 mA for socket-outlet circuits; it is typically specified for circuits supplying wet locations (bathrooms, showers) or medical IT rooms where a lower residual threshold is required by local wiring regulations.