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. It's rated 16 A with a C tripping curve and Type A fault-current sensitivity, meaning it handles both sinusoidal AC and pulsating DC residual currents common in electronics-heavy loads. Breaking capacity is 6 kA per EN 60898 for branch-circuit duty and 10 kA per IEC 60947-2 for industrial panel applications — the higher figure gives headroom for coordination with upstream devices in a distribution board. 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.
Panel fit and wiring
Snaps onto DIN rail, 2 width units (36 mm wide), 77 mm deep with 70 mm installation depth. 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. Touch protection is built in (IP20 with conductors connected, as installed in a distribution board).
Thermal derating and environment
Rated 16 A at 30 °C ambient. 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. Operating ambient range is -25 to +45 °C; storage range is -40 to +75 °C. Overvoltage category III, energy limiting class 3 — standard for distribution-board installation.