Siemens 5SU1154-6KV10 FI/LS-Protector Type A, 10A B-curve, 1

The 5SU1154-6KV10: The 10mA IΔn is a sensitive Type A residual current rating — it detects pulsating DC fault currents (e.g., from rectifiers, VFDs, or LED drivers) as well as sinusoidal AC. That 10mA threshold is below the standard 30mA for socket-outlet circuits; it's specified where lower leakage trip levels are required, such as medical IT rooms or wet-area final circuits per IEC 60364. The B-curve (3-5 In) trips on moderate overloads, suited for resistive and general-purpose loads, not high-inrush motor or transformer circuits.