The Siemens 5SU9356-1CN06 is a SENTRON RCBO — an RCD-operated circuit breaker combining overcurrent and residual current protection in a single 2-module-width (36 mm) package.
At 40 °C it derates to 5.3 A, at 45 °C to 5.2 A, at 50 °C to 4.9 A, and at 55 °C to 4.6 A. Mounting position is any, so vertical or horizontal DIN-rail orientation is fine.
