The Siemens 5SY6201-8 is a 2-pole miniature circuit breaker from the SENTRON 5SY6 series, with a D tripping characteristic rated at 1 A and 400 V AC. It's built for mechanical engineering and industrial environments where high inrush currents from motor loads or transformers are common — the D curve means it holds through those start-up spikes without nuisance tripping, then clears faults fast. Rated breaking capacity hits 6 kA per EN 60898 for general distribution, and 30 kA per IEC 60947-2 for industrial panel duty — that 30 kA figure tells you it's rated for high-fault-capacity installations where a standard MCB would weld its contacts shut. DC side is rated at 15 kA per IEC 60947-2 up to 72 V, and it carries a UL 1077 / CSA C22.2 No. 235 listing at 5 kA for North American acceptance.
Sealable design allows locking the handle position to prevent unauthorized toggling.