What this MCB does and where it fits
The Siemens 5SL4140-8CC is a 1-pole miniature circuit breaker with a D tripping characteristic, rated 40 A with a 10 kA breaking capacity at 230/400 V. The D curve means it tolerates the high inrush currents common with motor loads, transformers, and welding equipment — so it's the right choice for circuits where the start-up surge would nuisance-trip a B or C curve breaker. Snaps onto standard DIN rail inside a distribution board or industrial control panel.
Compliance and documentation
RoHS compliant since 01 June 2013. Contains lead (CAS 7439-92-1) above 0.1% w/w per the REACH candidate list, which is standard for electrical contacts — no special handling required for normal installation.