The Siemens 5SL6405-8CC is a 4-pole miniature circuit breaker from the SENTRON 5SL6 series, rated for 400 V with a 6 kA breaking capacity and a D-curve trip characteristic at 0.5 A. The D-curve means it tolerates the high inrush currents typical of motor and transformer loads — the magnetic trip threshold is 10–20× rated current, so it won't nuisance-trip on a motor start but clears a hard short fast. Snaps onto standard DIN rail in the panel; the 4-pole format handles three-phase plus neutral in a single housing, saving rail space over ganging individual single-pole breakers.
Lifecycle & Sourcing
RoHS compliant since June 2013; REACH Article 33 disclosure notes lead (CAS 7439-92-1) above 0.1% w/w in the current candidate list.
Export control classification is AL:N / ECCN:N, meaning no special license required for most destinations.