Siemens 5SU9356-7CR50 RCBO, 6 kA, 1P+N, 30 mA Type A, C-50 A

The Siemens 5SU9356-7CR50 is a combined residual current circuit breaker with overcurrent protection (RCBO) in a 1P+N form factor. It integrates a Type A residual current device rated at 30 mA with a C-characteristic miniature circuit breaker rated at 50 A, all in a single 1-module-wide unit for 230 V AC circuits. The 6 kA breaking capacity (Icn) means this device can safely interrupt fault currents up to 6 kA without welding its contacts or failing catastrophically — sufficient for most domestic and light commercial final circuits where the prospective short-circuit current at the board doesn't exceed that level. The Type A residual detection catches pulsating DC fault currents (typical from rectified loads like washing machines, LED drivers, or small VFDs) that a plain AC-type RCD would miss. The C-characteristic (C-Char) trips between 5 and 10 times rated current (250–500 A for this 50 A unit), which suits motor-starting or capacitive loads that draw high inrush without nuisance tripping. At 30 mA residual sensitivity it provides additional protection against lethal shock in wet or outdoor circuits.