What it is and what it does
The Siemens 5SL6450-6CC is a 4-pole miniature circuit breaker (MCB) from the 5SL6 Basic Devices family, rated 50 A with a B tripping characteristic at 400 V AC and a 6 kA breaking capacity. The B-curve means it trips between 3 and 5 times rated current—designed for resistive and general-purpose loads where inrush is modest, not motor-heavy circuits that would need a C or D curve.
Panel integration and DIN-rail fit
Standard 4-pole modular width—snaps onto a 35 mm DIN rail in the distribution board. The 6 kA breaking capacity at 400 V is adequate for most residential and light commercial sub-distribution panels, but verify the prospective short-circuit current at the point of installation.
Lifecycle and sourcing reality
RoHS compliant since June 2013 and REACH candidate-list notified. Export control is AL:N / ECCN:N—no special license required for cross-border shipment.