The Siemens 5SU9356-7KM10 is a SENTRON RCBO — an RCD-operated circuit breaker combining overcurrent and residual current protection in a single 2-module (36 mm wide) package.
Above that, derate: 9.4 A at 40 °C, 9.1 A at 45 °C, 8.7 A at 50 °C, and 8.1 A at 55 °C. Type A residual current detection covers both sinusoidal AC faults and pulsating DC — common with single-phase rectified loads like switched-mode power supplies or LED drivers. The 1P+N configuration protects one phase conductor; the neutral is switched but not protected against overload. Conductor cross-section range is 0.75 to 35 mm² for both solid and stranded, covering everything from small control wiring to heavy feeder tails.
Snaps onto standard DIN rail. Mounting position is any orientation. IP20 with connected conductors and installed in a distribution board, so it's for enclosed use only, not washdown areas. Touch protection is built in on the line side.