What this RCBO is and where it lands
The Siemens 5SU9354-7KK10 is a SENTRON RCD-operated circuit breaker — an RCBO that combines overcurrent protection and residual-current detection in a single 2-MW-wide module. It protects a single-phase final subcircuit (1P+N, one protected pole) against overload, short-circuit, and earth leakage in one go. Rated 10 A at 30 °C with a C-curve tripping characteristic, it handles the inrush of motorized or capacitive loads without nuisance trips. Breaking capacity is 10 kA per both EN 60898 and IEC 60947-2, so it clears faults up to that level in a 230/240 V AC, 50/60 Hz network. Supply can enter from top or bottom — no orientation fuss during panel build.
Thermal derating — the real current you get
The 10 A rating holds at 30 °C ambient. Inside a warm enclosure at 40 °C it derates to 9.4 A; at 50 °C it drops to 8.7 A; at 55 °C it is 8.1 A. If the panel runs hot — near a drive or transformer — size the circuit for the derated figure, not the nameplate 10 A. The RCBO is halogen-free and silicon-free, which matters for clean-room or corrosive-environment spec.
Panel fit and environmental limits
The module is 36 mm wide (2 MW), 77 mm deep, 90 mm tall, with a 70 mm installation depth — fits standard DIN-rail enclosures. IP20 only when the distribution board is installed and conductors are connected; not rated for wet or dusty environments without an enclosure. Pollution degree 2, overvoltage category III, surge voltage resistance 4 kV. Operating temperature range -40 °C to 75 °C, with max 95% humidity. Mount in any position.