Siemens 5SU9336-7CN63 RCBO, 6 kA, 1P+N, Type A, 30 mA, C-63

The Siemens 5SU9336-7CN63 is a residual current operated circuit breaker with integral overcurrent protection — an RCBO in a 1P+N package. It combines a Type A residual current device (30 mA trip threshold) with a C-characteristic thermal-magnetic breaker rated 63 A, all in a single modular unit that snaps onto a DIN rail in a distribution board. Rated breaking capacity is 6 kA at 230 V AC, which covers the fault-current duty of most residential and light-commercial final subcircuits. The Type A RCD element catches both sinusoidal AC and pulsating DC residual currents — the kind you get from electronics, rectifiers, and variable-speed drives on the same line.