What it is and what it does
The Siemens 5SU9356-2CN63 is a 1+N-pole residual current circuit breaker with overcurrent protection (RCBO) from the Construction line, rated 63 A with a D tripping characteristic and a 6 kA breaking capacity. The type AC designation means it detects sinusoidal AC residual currents only — suited for circuits without rectified or pulsed DC fault currents. The D characteristic provides a higher magnetic trip threshold (10–20× In), sized for loads with high inrush, such as small motors, transformers, or discharge lighting.
Where it goes and how it fits
Snap-on DIN rail mount for standard 18 mm modular enclosure spacing. The 1+N form factor occupies a single module width, leaving adjacent slots free for other DIN-rail devices. Rated for 50/60 Hz networks — common across European-style distribution panels. Terminal capacity accepts up to 25 mm² conductor, typical for final subcircuits at this current level.