The Siemens 5SL4450-8CC is a 4-pole miniature circuit breaker (MCB) rated for 400 V with a 10 kA breaking capacity, D-curve trip characteristic, and 50 A rated current. The D-curve means it tolerates inrush currents 10–20 times the nominal rating before tripping magnetically, making it the right choice for motor, transformer, or power-supply branch circuits where the startup surge would nuisance-trip a B or C curve breaker. It snaps onto a standard DIN rail in the panel, occupying four modular-width positions.
Compliance and documentation
RoHS compliant since 01-06-13. REACH Article 33 disclosure: contains lead (CAS-No. 7439-92-1) above 0.1% w/w in the current candidate list. Export control is AL:N / ECCN:N, so no special license is needed for cross-border shipment. The product class is B — return restricted, meaning Siemens requires direct partner contact for returns or warranty claims, not a standard distributor RMA process.