The Siemens 5SU1356-7KV10 is a 1+N-pole FI/LS protector (RCBO) combining overcurrent and residual current protection in a single module. It is rated Type A, 30 mA sensitivity, 6 kA breaking capacity, with a C-curve 10 A thermal-magnetic trip. The Type A detection handles pulsating DC fault currents up to 6 mA superimposed on AC — common on modern electronic loads like VFDs, switched-mode supplies, and LED drivers where a pure AC-sensitive device would miss the fault.
The C-curve (10 A) means the magnetic trip activates between 5× and 10× rated current — 50 A to 100 A — so it tolerates the inrush of small motor or capacitive loads without nuisance tripping, while still clearing a hard short.