Siemens 5SL4415-8CC Miniature Circuit Breaker 400V 10kA 4P D

The Siemens 5SL4415-8CC is a 4-pole miniature circuit breaker from the 5SL4 Basic Devices family, rated 400 V with a 10 kA breaking capacity and a D-characteristic trip curve at 1.6 A. The D-curve (10–20× In) means this MCB is sized for loads with high inrush currents — motor starters, small transformers, or capacitor banks — where a B or C curve would nuisance trip on startup. The 10 kA interrupting rating at 400 V is the standard for residential and light commercial distribution boards; it safely clears a bolted fault up to that level without upstream damage. Snap-on DIN rail mounting for 4-pole width. The 1.6 A rating governs the connected load: at 400 V three-phase, that's roughly 1.1 kW resistive or about 0.75 kW for a motor load (accounting for the D-curve headroom).