What this 4-pole MCB delivers for the panel
The Siemens 5SN6410-8CP is a 4-pole miniature circuit breaker from the SENTRON 5SN family, rated for 400 V AC at 50 Hz. Its C-curve trip characteristic handles moderate inrush loads — motor starters, contactor coils, banks of LED drivers — without nuisance trips, while still clearing faults fast enough to protect downstream wiring. That dual rating means one part number covers both the branch panel and the machine disconnect — no need to swap for a higher-interrupting variant when the SCCR study comes back. Accepts solid conductors up to 35 mm², so it handles the feed from a 40 A busbar tap without a ferrule or reducer. Rated for -40 °C to 75 °C ambient. Mechanical endurance is 10,000 operating cycles.