The Siemens 5SU1654-6KV06 is a Sentron FI/LS-Protector combining a Type A residual-current device (RCD) and a miniature circuit breaker (MCB) in a single 1+N-pole unit. Rated B 6A for the MCB side and 300 mA sensitivity for the RCD side, with a 10 kA breaking capacity. D=70 mm width fits standard DIN-rail enclosures.
The Type A designation means it detects pulsating DC fault currents in addition to AC — important for modern loads like variable-speed drives, LED lighting, and medical equipment that generate residual currents a standard Type AC device would miss.