The Siemens 5SY4113-8CV is a 1-pole miniature circuit breaker with a D tripping characteristic and a 13 A rated current. Its interrupting capacity is rated at 15 kA at both 230 V and 400 V, covering the standard panel supply voltages across most commercial and industrial installations.
The D-curve (D13) means the magnetic trip threshold is 10–20× In, so it handles high inrush currents from motor loads, transformers, or discharge lighting without nuisance tripping. The 15 kA Icu at 400 V tells you this breaker safely interrupts fault currents up to that level on a 400 V three-phase supply — important for coordination studies where the prospective short-circuit current at the panel exceeds 10 kA.