The Siemens 5SU1356-1GV16 is a SENTRON RCBO (residual current circuit breaker with overcurrent protection) combining a 16 A rated current with a 30 mA residual-current trip in a single 2-module-wide (36 mm) package. The Type AC detection handles sinusoidal AC fault currents — the standard choice for general-purpose circuits in residential and light commercial distribution boards where no electronic loads generate pulsed DC fault current. Rated breaking capacity is 6 kA per EN 60898 and 15 kA per IEC 60947-2, so it clears line-to-neutral faults up to those levels without upstream cascading. The C characteristic (tripping between 5× and 10× In) suits moderate inrush loads like small motors, lighting banks, and transformer-coupled gear.
Thermal derating and mounting
Full 16 A rating holds at 30 °C ambient; at 40 °C it derates to 15.2 A, at 50 °C to 14.4 A, and at 70 °C to 12.32 A. Mounting position is unrestricted, and the supply can enter from either top or bottom — no forced orientation in the panel. The 36 mm width (2 modular units) snaps onto standard DIN rail. Installation depth is 70 mm; overall depth with the housing is 77 mm. IP20 applies once the distribution board is installed and conductors are connected — the front face is touch-protected.