The Siemens 5SL4305-8CC is a 3-pole miniature circuit breaker (MCB) from the Basic Devices family, rated at 0.5 A with a D tripping characteristic and a 10 kA breaking capacity at 400 V. This is a DIN-rail mounted device for panel integration in distribution boards and sub-distribution enclosures. At 0.5 A, this breaker is sized for control-circuit protection or small transformer primaries, not general-purpose final subcircuits.
Product class B indicates return restrictions — contact your Siemens partner for RMA or warranty handling. The part is RoHS compliant since June 2013 and carries a REACH Article 33 disclosure for lead (CAS 7439-92-1) above 0.1% w/w.