The Siemens 5SU9356-7KK06 is a SENTRON RCBO — an RCD-operated circuit breaker combining overcurrent and residual-current protection in a single 2-module-wide (36 mm) package. It's a 1P+N unit, meaning it switches the line and monitors the neutral, with a C-curve trip characteristic rated at 6 A at 30 °C. That C-curve means it's built for moderate inrush loads like small motors, pumps, or lighting banks — the magnetic trip kicks in between 5 and 10 times the rated current, so it won't nuisance-trip on a compressor start but clears a hard fault fast.
Breaking capacity and selectivity
This RCBO carries a 6 kA breaking capacity per EN 60898 and a 10 kA rating per IEC 60947-2. That dual rating is the key spec for panel builders: the 10 kA figure under 60947-2 gives you SCCR headroom for industrial panels where fault currents can run higher than a residential 6 kA installation. The 4 000 V surge voltage resistance and overvoltage category III mean it's rated for fixed-installation distribution boards, not just final circuits.
Thermal derating and mounting
The 6 A rating is at 30 °C ambient. At 40 °C it derates to 5.64 A, at 50 °C to 5.22 A, and at 55 °C to 4.86 A. If your panel runs hot — say a packed enclosure near a furnace line — size the load accordingly. Mounting position is any, so vertical or horizontal DIN-rail orientation works. Depth is 77 mm, installation depth 70 mm, and it's IP20 once installed in a distribution board with conductors connected. That's standard for enclosed panel gear; no washdown rating here.
Compliance and documentation
Halogen-free and silicon-free construction — matters for clean-room or high-reliability installs where outgassing can't contaminate contacts or optics. The part is designed to EN 60898 and IEC 60947-2, so it carries the CE mark for European markets. Degree of pollution 2 and overvoltage category III round out the installation class. No UL or CSA listing is stated in the spec record, so verify with your local code authority if you're specifying for a North American panel.