The GS1LLB3 is a TeSys GS fuse switch disconnector body — a 3-pole, 160 A rated device that uses BS-type fuses (size A4) to provide overcurrent and short-circuit protection in a distribution or motor circuit. It's the body only; you add the operating handle (external right-side or frontal) and the fuses to complete the assembly. Rated operational current hits 160 A at 400 V in AC-23A and AC-23B duty — that's the heavy motor-switching category, so it's sized for starting and stopping induction motors under load. At 690 V with the terminal cover fitted, it still carries 125 A in the same AC-23 categories. The short-circuit withstand rating of 80 kA tells you the fuse assembly can survive a high-energy fault without rupturing, provided the upstream protection is coordinated.
Power connections are via bars or screw terminals accepting 50 to 95 mm² flexible cable. Control circuit and power circuit both torque to 12 N·m on the screw terminals, so one torque setting covers the whole job. The protective treatment is TH (tropicalized), so it handles humidity and mild corrosive atmospheres inside a sealed enclosure.
The GS1LLB3 is listed as obsolete. That means Schneider Electric no longer manufactures it as a standard catalog item. Because it's a body-only part in a modular family, the closest functional replacement would be a current-production TeSys GS body with the same pole count, BS fuse size, and 160 A rating. The mounting footprint and connection pattern are consistent across the GS1 generation, so panel rework is usually minimal — but verify the handle compatibility and terminal cover fit before committing the swap.
Designed and tested to IEC 60269-1, IEC 60269-2 (fuse standards), and IEC 60947-3 (switch-disconnector standard). The body and fuse cover pass the glow-wire test at 960 °C and 850 °C respectively per IEC 60695-2-1, so it's suitable for installations where fire resistance is a requirement.
Environmental range and durability
Mechanical durability is rated at 10,000 cycles; electrical durability varies by duty class — 1,000 cycles in AC-23A or AC-23B, dropping to 200 cycles in DC-23A or DC-23B. That's typical for a fuse switch body; the fuses themselves are single-use, so the electrical endurance figure applies to the switch mechanism under load.