What the ratings mean for fit
The 5SU9356-2CN06: The 6 A rated current and D characteristic suit loads with high inrush, such as small motor drives or transformers, where the D curve provides a higher magnetic trip threshold (10–20× In) to avoid nuisance tripping. The 6 kA breaking capacity covers standard domestic and light commercial fault levels. Type AC residual detection handles sinusoidal AC leakage only — not pulsed DC or smooth DC, so it is not suitable for circuits with variable-speed drives, UPS, or EV chargers without additional protection. The 1+N form factor (switched phase, solid neutral) fits standard Siemens DIN-rail distribution boards alongside other 1+N RCBOs.