Siemens 5SU9356-8CN20 RCBO 1+N 6 kA D char. 20 A

The Siemens 5SU9356-8CN20 is an RCBO (residual current circuit breaker with overcurrent protection) in the Construction line, combining ground-fault and overcurrent protection in a single 1+N module. Rated at 20 A with a D-characteristic trip curve and type A residual current sensing, it breaks fault currents up to 6 kA. The D curve means it tolerates high inrush currents — typically found on motor or transformer loads — without nuisance tripping, while the type A sensing catches pulsating DC residual currents that standard AC types miss.