In a panel, that C-curve means it holds through inrush up to 5–10× rated current — typical for motor starters, small transformers, or lighting banks — and trips fast on hard shorts. Tunnel terminals top and bottom accept the same wire gauge, so feed-through wiring is straightforward.
Installation depth is 70 mm — shallow enough for most distribution boards and sub-panels without crowding the wiring channel. Tunnel terminals top and bottom accept copper conductors up to the rated cross-section; no special busbar adapter needed for single-phase feed-through.