The Siemens 5SU9356-7KN16 is a SENTRON RCBO — an RCD-operated circuit breaker that combines overcurrent and residual-current protection in a single 1P+N unit. At 16 A and C-curve, this is a standard fast-mover for general-purpose final circuits in commercial and light-industrial panels: lighting, socket outlets, small motor loads. The Type A characteristic catches the rectified fault currents that a plain AC-sensitive RCD would miss.
Mounting position is unrestricted — installs any orientation in the enclosure. Terminals accept solid or stranded conductors from 0.75 mm² up to 35 mm², which covers everything from 1.5 mm² lighting tails to 10 mm² submain feeds. Halogen-free and silicon-free construction suits environments where outgassing matters. Supply can land on either top or bottom terminals — no mandatory orientation.
Thermal derating and environment
Derates to 15.04 A at 40 °C, 14.56 A at 45 °C, 13.92 A at 50 °C, and 12.96 A at 55 °C. If the panel runs warm, size the upstream protection accordingly. Overvoltage category III, energy limiting class 3 — standard for distribution-board installation.