The 16 A rated current (In) at 30 °C is the continuous load it carries in a 30 °C ambient; the C-curve magnetic trip operates at 5–10 × In (80–160 A), so it handles motor inrush and transformer energisation without nuisance tripping on circuits that don't need a B or D curve. The 30 mA sensitivity catches line-to-ground faults that could be lethal through a person, and the Type A-SI (Super Immunised) designation means the electronic trip is hardened against pulsed DC and high-frequency leakage — common on variable-speed drives, LED drivers, and UPS-fed circuits where a standard Type A or AC RCD would nuisance-trip.
Mounts on a 35 mm DIN rail, 36 mm wide (4 × 9 mm pitches), 77.5 mm deep, 81 mm tall. Tunnel terminals top and bottom accept 1–16 mm² rigid or 1–10 mm² flexible with ferrule; strip length 15 mm, tighten to 2 N·m. Neutral is on the left. IP20 on the body, IP40 inside a modular enclosure. Pollution degree 3, overvoltage category IV — rated for the harsh end of a distribution board.