The Siemens 5SL4405-8 is a SENTRON 5SL4 miniature circuit breaker — 4-pole, D tripping characteristic, rated 0.5 A at 400 V AC.
The D-curve (tripping characteristic class D) means this breaker tolerates high inrush currents — typically 10–20× rated current for short durations — making it a natural fit for motor, transformer, or lighting ballast loads that draw a heavy startup surge. At 0.5 A it is sized for small auxiliary circuits, not main feeders.
Panel integration
At 72 mm wide (4 width units) and 76 mm deep, it fits a standard distribution board. Screw terminals accept solid or stranded conductors from 0.75 to 25 mm²; tighten to 2.5–3 N·m.