The Siemens SENTRON 5SU9346-1CN10 is a 4-pole RCD-operated circuit breaker — an RCBO — combining overcurrent protection and residual current detection in a single modular device. It is rated 10 A with a C tripping characteristic and 30 mA residual current sensitivity, breaking capacity 6 kA per EN 60898 and IEC 60947-2. The C-curve means it trips between 5 and 10 times rated current, suited for inductive loads like small motors or lighting banks where inrush is moderate. The 30 mA AC-type residual current detection covers line-to-ground faults on standard sinusoidal AC circuits.
Thermal derating and panel integration
The 10 A rating holds at 30 °C ambient; it derates to 9.1 A at 40 °C, 8.7 A at 45 °C, 8.3 A at 50 °C, and 7.8 A at 55 °C. In a crowded distribution board with multiple RCBOs ganged, the effective current per pole drops — size the downstream load against the derated figure for the enclosure's internal temperature, not the nameplate 10 A. The device occupies 7 modular width units (126 mm wide) and installs 70 mm deep into the panel. Snap-on DIN rail mounting, any orientation. IP20 applies only when the distribution board is closed and conductors are connected — no exposed terminals during operation. Rated insulation voltage 440 V, overvoltage category III, pollution degree 2.