The 100 A rating at 40 °C means it protects distribution feeders and branch circuits up to that continuous current without nuisance tripping in a warm panel.
Mounts on a backplate in any orientation — horizontal, vertical, or flat on the back. The 108 mm width (12 x 9 mm pitches) and 137 mm height fit standard panel cutouts. Front-facing connections top and bottom; neutral is on the left. The Everlink lug terminals accept 2.5 to 95 mm² rigid aluminium or copper, or 2.5 to 70 mm² flexible copper — one lug per pole. Connection pitch is 35 mm with spreaders, 27 mm without. The flag indicator (green) shows presence of auxiliary contacts.