What the ratings mean for fit
The Siemens 5SL4540-8CC is a 1+N-pole miniature circuit breaker rated 40 A with a D tripping characteristic, per the description. The D curve means it tolerates inrush currents 10–20 times the rated current before tripping magnetically — sized for motor or transformer loads where the starting surge would nuisance-trip a B or C curve breaker. The 10 kA interrupting capacity at 230 V is the maximum fault current it can safely clear; verify the prospective short-circuit current at the installation point stays under that figure for coordination.
Compliance documentation
RoHS compliant since 01 June 2013. REACH Article 33 declaration notes lead (CAS 7439-92-1) above 0.1% w/w in the candidate list. Export control classifications: AL N / ECCN N — no license required for most destinations.