The Siemens 5SU1354-0KV32 is a combined residual-current device and miniature circuit breaker (RCBO) — an FI/LS protector — in a single 1+N-pole module. It delivers Type AC residual current detection at 30 mA, combined with a B-curve overcurrent trip at 32 A, all rated for a 10 kA breaking capacity. The 30 mA trip threshold means it protects against direct-contact faults in circuits supplying socket outlets or general-purpose loads, not just fire-prevention earth leakage.
The 1+N-pole form factor occupies a single module width, so it fits retrofit into existing consumer units or sub-distribution panels without re-spacing. The Type AC detection handles sinusoidal AC residual currents — the most common domestic fault waveform — but does not cover pulsating DC or smooth DC faults. For circuits with variable-speed drives, LED lighting, or EV chargers, a Type A or Type F device would be needed instead.