RCD-MCB with Type A sensitivity and dual breaking capacity
The Siemens 5SU9356-7KK63 is a 2-pole (1P+N) RCD-operated circuit breaker from the SENTRON 5SU9 series, combining overcurrent protection with residual-current detection in a single 36 mm wide DIN-rail module. The Type A fault-current design detects both sinusoidal AC and pulsating DC residual currents — the standard choice for circuits with single-phase rectifiers, switched-mode power supplies, or variable-speed drives downstream. The higher 10 kA figure gives the headroom needed for commercial or light-industrial distribution boards where fault currents exceed 6 kA.
At 40 °C it derates to 59.22 A, at 45 °C to 57.33 A, at 50 °C to 54.81 A, and at 55 °C to 51.03 A.
Mounting position is any orientation. Supply can enter from either top or bottom, which simplifies busbar routing in multi-row panels. IP20 rated with conductors connected and the distribution board installed.