The Siemens 5SL4550-8CC is a 1+N-pole miniature circuit breaker rated 230 V with a 10 kA breaking capacity, D tripping characteristic, and 50 A current rating. It belongs to the SENTRON 5SL4 series of Basic Devices, designed for final-distribution panels and sub-distribution boards where high inrush currents — typical of motor or transformer loads — require the D curve's wider magnetic trip threshold.
This part carries product class B, which restricts return to the manufacturer — standard for Siemens MCBs sold through distribution.