It accepts DIN fuse links in size 3, making it a load-break disconnect for motor or distribution circuits where fuse protection is integral to the switch. Rated operational current spans 315 A at 690 V AC-23A up to 630 A at 400 V AC-23B, so the same unit covers both 400 V and 690 V networks by derating the fuse size or duty class. Breaking capacity at 400 V AC-23B is 5040 A; making capacity reaches 6300 A at the same condition.
Sourcing Reality: Obsolete Status
Schneider Electric lists the GS2SG4 as obsolete. No direct successor order code is published in the lifecycle record.
The AC-23B duty rating (630 A at 400 V) governs motor switching with occasional overloads; AC-23A (315 A at 690 V) covers higher-voltage but lighter-duty applications. Short-circuit withstand is 70 kA, meaning the switch holds together under a fault until the upstream fuse clears. Mechanical durability is 8000 cycles; electrical durability is 1000 cycles at AC-23A or AC-23B. That is a moderate life — fine for a main disconnect switched a few times per shift, not for a high-cycle process interlock.
Plate-mounted with an external left-side operating handle. Power circuit terminals accept bars up to 63 mm² or ring lugs for two cables up to 300 mm² each. Tightening torque is 44 N·m on the power connections — a torque wrench is expected.