The Siemens 5SU9356-7CR63 is a single-pole-plus-neutral residual current circuit breaker with overcurrent protection (RCBO) rated at 63 A, 230 V AC. It combines a C-characteristic miniature circuit breaker and a Type A residual current device (30 mA) in one DIN-rail module, saving panel space compared to a separate MCB + RCCD pair. The 6 kA rated short-circuit capacity (Icn) covers most residential and light commercial final circuits.
The 1P+N form factor occupies a single modular width on a DIN rail, with the neutral pole switched internally. Type A RCD sensitivity (30 mA) detects sinusoidal AC and pulsating DC fault currents, covering standard socket-outlet and lighting circuits where electronic loads (SMPS, dimmers) are present. The C-characteristic curve trips at 5–10× In, suited for circuits with moderate inrush, such as motorized appliances or capacitor banks.