The Siemens 5SL6410-6CC is a 4-pole miniature circuit breaker (MCB) with a B-curve trip characteristic, rated at 10 A and 400 V, with a 6 kA breaking capacity. It's a current-production Basic Device from the 5SL family, commonly used in distribution panels for protecting branch circuits against overloads and short circuits.
The 6 kA breaking capacity at 400 V covers most commercial and light-industrial panel fault levels; for higher SCCR requirements you'd step up to the 5SL6 series with 10 kA or the 5SY with 25 kA.