Mounts on a 40-mm busbar system per DIN 43870 Part 2, so it drops into a meter-panel or distribution board without a separate DIN rail. The 89.5 mm depth fits standard enclosure depths; solid and stranded wire from 2.5 to 50 mm² terminates at the spring-loaded outgoing terminal.
The E-curve (tripping characteristic E) is the key selection parameter: it holds 10–20× rated current for a short duration, so it avoids nuisance trips on transformer inrush or motor start while still clearing a bolted fault.