The Schneider Electric A9GSB792 is an Acti9 SBI fuse-disconnector, 3P+N, rated 125 A at 690 V AC. It takes 22 x 58 mm fuses with a GG or AM curve. That 690 V AC rating means it handles line-to-line voltage in 400 V three-phase systems with headroom — no derating worry on a standard 400 V panel. The 125 A continuous rating covers most feeder circuits up to that size; if your load draws less, the fuse rating you install sets the protection level, not the switch body.
Screw-clamp terminals accept 1.5 to 50 mm² rigid cable, or 2.5 to 35 mm² flexible (with or without ferrule). Strip length is 12 mm; tightening torque is 4 N.m. That's a generous wire range — covers everything from control-circuit tails to main feeder conductors. Terminal position is top or bottom, so you can feed either direction.