The MGN15712 is a Schneider Electric Acti9 SBI fuse-disconnector — 3 poles plus neutral, rated 50 A at 690 V AC, built for 14 x 51 mm fuses with an AM GG curve.
The 690 V AC rated operational voltage covers standard industrial supplies. The 50 A maximum rating is the fuse-limited current; the disconnect itself carries the full 50 A through screw-clamp terminals accepting 2.5 to 25 mm² cable, tightened to 3.5 N·m.
