The Siemens 5SU9104-1KK16 is a SENTRON RCBO — an RCD-operated circuit breaker that combines overcurrent protection and residual current detection in a single 18 mm-wide module. It's a 1P+N design (switched phase, switched neutral) with a C-curve trip characteristic rated 16 A at 30 °C, and a 10 kA breaking capacity certified to both EN 60898 and IEC 60947-2.
Panel fit and derating
The 77 mm overall depth includes the front projection. Derating is significant above 30 °C: 15.04 A at 40 °C, 14.56 A at 45 °C, 13.92 A at 50 °C, and 12.96 A at 55 °C.
Compliance and environment
IP20 with the distribution board installed and conductors connected. Surge current resistance at 8/20 μs is 1 kA. Energy limitation class 3.