Siemens 5SV1616-7KK04 RCBO 1P+N 6kA Type A 300mA C4

The Type A residual-current characteristic detects pulsating DC fault currents as well as sinusoidal AC, which matters for circuits feeding electronics, variable-speed drives, or appliances with half-wave rectification that can blind a standard Type AC device. The 300 mA sensitivity is a fire-protection level, not a personnel-protection level (which typically requires 30 mA or lower); it is specified for circuits where the leakage is expected to be higher — older wiring, long cable runs, or equipment with inherent leakage — and the goal is arc-fault and insulation degradation detection rather than shock prevention.