The Siemens 5SU9356-1CN06 is a SENTRON RCBO — an RCD-operated circuit breaker combining overcurrent and residual current protection in a single 2-module-width (36 mm) package. It protects a single pole (1P+N) at 6 A with a C tripping characteristic, and the integrated RCD trips at 30 mA for Type AC residual currents. The 6 kA breaking capacity per EN 60898 covers most domestic and light commercial sub-distribution boards. Rated insulation voltage (Ui) is 264 V, overvoltage category III, pollution degree 2 — standard for fixed-installation final circuits. The unit is halogen-free and silicon-free, which matters for panels in clean-room or corrosive environments where outgassing must be minimised.
Thermal derating and mounting
The 6 A rating holds at 30 °C ambient. At 40 °C it derates to 5.3 A, at 45 °C to 5.2 A, at 50 °C to 4.9 A, and at 55 °C to 4.6 A. If the panel runs warm — say, a densely populated enclosure — size the load to the derated figure, not the nameplate 6 A. Mounting position is any, so vertical or horizontal DIN-rail orientation is fine. Installation depth is 70 mm, overall depth 77 mm; the unit occupies 2 modular width units (36 mm) on the rail.