The MGN15714 is a Schneider Electric Acti9 SBI fuse-disconnector — a 1N-pole (single-phase plus neutral) switch-disconnect rated to break and isolate circuits protected by 22 x 58 mm fuse links. Its screw-clamp terminals accept 2.5 to 25 mm² rigid or flexible cable, tightened to 3.5 N·m.
If you are freezing a new design, the closest functional match within the Acti9 range would be a current-production fuse-disconnector with the same 1N pole count, 125 A rating, and 22 x 58 mm fuse accommodation — verify the physical footprint and terminal layout against your panel cutout before substituting.
The 125 A maximum rating (with a 32–125 A fuse range) and 690 V AC operational voltage define the disconnect's interrupting capacity under IEC EN 60947-3. That standard covers switch-disconnectors for industrial use — the part is designed to make, carry, and break currents under normal service conditions, including infrequent motor switching, and to provide visible isolation for safe maintenance. The GG/AM fuse curve compatibility covers both general-purpose (GG) and motor-protection (AM) fuse links — so the same disconnect body works for distribution feeders or motor branch circuits, depending on the fuse element installed.