The Siemens 5SU1356-1DA16 is an FI/LS combination unit — an RCD and MCB in one 1+N-pole module, rated Type AC, 30 mA residual current, 6 kA breaking capacity, C-curve 16 A overcurrent protection, with a pigtail neutral connection. The 70 mm depth fits standard DIN-rail enclosures; the pigtail means the neutral conductor is factory-attached, saving a wiring step at panel build.
What the ratings mean for fit
Type AC detection means it trips on sinusoidal AC residual currents only — fine for resistive and inductive loads like heaters, contactors, and lighting, but not for pulsating DC or mixed-frequency faults from VFDs or switched-mode supplies. The 30 mA sensitivity is standard for personnel protection (shock risk) per IEC 60364. The 6 kA breaking capacity at the rated voltage is the maximum prospective fault current it can safely interrupt; verify the available fault current at the installation point does not exceed this. The C-curve (16 A) means the magnetic trip activates at 5–10× rated current, suited for loads with moderate inrush like small motors, pumps, and compressors.