Siemens 5SY8406-8 — SENTRON 4-pole D-curve MCB, 6 A, 50 kA
Breaking capacity is 50 kA per IEC 60947-2.
For DC circuits, rated breaking capacity is 15 kA at up to 72 V DC per IEC 60947-2. The D-curve's 10–20× In magnetic trip threshold means this breaker will hold through motor starting currents that would trip a C-curve (5–10× In). For a 6 A rating, the magnetic trip point sits between 60 A and 120 A — enough headroom for a small motor or transformer inrush without sacrificing short-circuit protection.
Environmental and installation notes
Halogen-free and silicon-free construction suits environments sensitive to outgassing, such as clean rooms or food-processing panels. The sealable design allows the panel builder to lock the breaker in the ON or OFF position with a padlock, meeting lockout/tagout requirements without an external accessory.