FI/LS-protector, Type AC, 30 mA, 6 kA, C 10 A
The Siemens 5SU1356-1DV10 is an FI/LS-protector — a combined RCD and MCB in one 1+N-pole unit — Type AC (WS) with a residual operating current IΔn of 30 mA, rated short-circuit capacity 6 kA, and a C‑curve overcurrent trip at 10 A. The pig-tail connection simplifies wiring in distribution boards where space is tight.
What the ratings mean for fit
Type AC means it detects sinusoidal AC residual currents only — fine for general socket-outlet and lighting circuits where no rectified or pulsed DC fault currents are expected. The 30 mA IΔn is the standard for personal protection against direct contact (30 mA trip threshold per IEC 60364). The 6 kA breaking capacity (Icn) matches typical domestic or light commercial distribution boards; if the prospective short-circuit current at the installation point exceeds 6 kA, a backup fuse or higher-rated upstream device is needed. C‑curve (10 A) handles moderate inrush from small motor or capacitive loads without nuisance tripping.