The Siemens 5SU9156-7KK32 is a 2-pole RCBO — a combined residual-current device (RCD) and miniature circuit breaker (MCB) in one 36 mm wide module. Rated 32 A at 30 °C with a 10 mA residual-current trip threshold and Type A sensitivity, it catches sinusoidal AC faults and pulsating DC faults up to 10 mA.
Rated short-circuit capacity is 6 kA per EN 60898 and 10 kA per IEC 60947-2. The 10 kA figure under 60947-2 is the one that matters for industrial panel coordination — it tells you this RCBO can safely interrupt a fault up to 10 kA at the rated voltage without welding its contacts or cascading the arc upstream. The 6 kA EN 60898 rating is the residential/commercial standard; the higher IEC rating gives you headroom in a plant-floor distribution sub-panel.
Thermal derating and environment
At 40 °C it derates to 30.08 A; at 50 °C to 27.84 A; at 55 °C to 25.92 A.