The Siemens 5SY4250-8CV is a 2-pole miniature circuit breaker (MCB) with a D tripping characteristic and a 50 A rated current. Its key specification is the 15 kA ultimate breaking capacity (Icu) at 400 V AC, which means it can safely interrupt fault currents up to that level without welding its contacts or failing catastrophically — critical for installations where the prospective short-circuit current at the panel exceeds the standard 6 kA or 10 kA class.
Rated for 400 V AC and built in a 2-pole format, the 5SY4250-8CV snaps onto a standard 35 mm DIN rail inside a distribution board or control panel.