The Siemens 5SU9353-1KK06 is a 2-pole RCD-operated circuit breaker (RCBO) from the SENTRON family, combining overcurrent protection (C-curve, 6 A) with 30 mA residual-current protection in a single 36 mm-wide (2 MW) module.
The 4.5 kA breaking capacity at 230/400 V AC meets the standard domestic and light commercial fault level; if the prospective short-circuit current at the installation point exceeds 4.5 kA, a higher-rated upstream MCB or fuse is needed. The 77 mm depth (70 mm installation depth) fits standard 80 mm-deep distribution boards. The IP20 rating applies only when the distribution board is installed and conductors are connected — the device itself is not sealed for wet environments.
Supply can enter from either the top or bottom. The neutral conductor is switched internally (2-pole switching). Touch protection is built in. Halogen-free and silicon-free construction meets low-smoke, low-toxicity requirements for public-access buildings.