It protects final circuits against both overload/short-circuit (MCB function) and series/parallel arcing faults that can cause electrical fires. The C-curve means magnetic trip occurs at 5–10× rated current, so it tolerates moderate inrush from motors or capacitive loads without nuisance tripping.
Arc-fault detection range and selectivity
The AFDD function detects series arcs (e.g., loose connections or damaged conductors) from 2 A to 40 A, and parallel arcs (line-to-neutral or line-to-ground) from 50 A to 500 A. This wide detection envelope covers both low-energy tracking arcs and high-current fault arcs. The unit is short-time-delayed (no intentional delay) so it clears fast, but it coordinates with upstream overcurrent devices — the 6 kA rating ensures it interrupts faults within its own capacity without relying on a backup fuse or breaker.
Snaps onto DIN rail and occupies one modular width (18 mm). Depth is 68.5 mm, installation depth 70 mm.
Environmental and service life
Halogen-free and silicon-free construction — important for clean-room or corrosive-environment installations where outgassing must be minimized. Overvoltage category III (fixed installation), pollution degree 2.