The Siemens 5SU1356-1DA10 is a combined residual-current and miniature circuit breaker (RCBO) — an FI/LS protector — in a 1+N-pole form factor. It packs Type AC earth-leakage detection at 30 mA with a C-curve thermal-magnetic overcurrent trip set at 10 A, all rated for a 6 kA breaking capacity. The pig-tail connection (D=70 mm) makes it a direct swap into older or retrofit panels where the neutral is brought out as a flying lead rather than a busbar stab.
What the ratings mean for fit
Type AC detection means this unit responds to sinusoidal AC residual currents only — standard for general-purpose socket-outlet circuits, lighting, and small appliances where no pulsed DC or variable-frequency drive leakage is present. The 30 mA trip threshold is the standard for personal shock protection (IEC 60364-4-41). The C-curve (10 A) handles moderate inrush from motorized loads like pumps or compressors without nuisance tripping. The 6 kA breaking capacity covers most domestic and light commercial distribution boards; if your fault level exceeds that, you need an upstream backup fuse or MCB.