The Schneider Electric GS1LLBR4 is a TeSys GS fuse switch disconnector body — a 4-pole, BS-type fuse carrier rated for 160 A at 400 V AC-23B. It's the switching and isolating element for motor or distribution circuits where BS fuses provide the overcurrent protection. The 160 A AC-23B rating means it handles the high inrush of motor starting (switching motors, resistive and mixed loads) without derating, and the 1280 A breaking capacity at 400 V AC-23B tells you it can interrupt fault currents up to that level safely — important for coordination with upstream protection.
Rated operational current: 160 A at 400 V AC-23A and AC-23B, 160 A at 500 V AC-23A/B, and 125 A at 690 V AC-23A/B. If your application is a motor circuit at 400 V, the 160 A rating is the line to match against your full-load current. For DC applications, it's rated 125 A at 440 V with 2 poles in series per phase (DC-23A and DC-23B). Making capacity: 1600 A at 400 V AC-23B — that's the peak current the switch can close onto without welding or damage. Both figures are well above typical motor starting currents, giving headroom for most industrial feeders. Short-circuit withstand: 80 kA, but that's with the associated BS fuses doing the interrupting — the switch itself is rated to hold off the let-through energy until the fuse clears. The rated short-circuit making capacity (Icm) is 160 kA rating of associated fuses, or 1.6 kA at 400 V with protection by BS fuses. Insulation coordination: rated insulation voltage (Ui) 750 V, impulse withstand (Uimp) 8 kV — covers 690 VAC systems with margin, and the 8 kV impulse rating means it's suitable for installations with surge category III/IV environments.
The 4-pole configuration suits three-phase plus neutral, or two-pole DC circuits with series poles for higher DC voltage ratings.
Designed and tested to IEC 60269-1 (low-voltage fuses), IEC 60269-2 (supplementary requirements for fuses for use by authorized persons), and IEC 60947-3 (switches, disconnectors, switch-disconnectors and fuse-combination units). The fire resistance rating is 960 °C for the body and 850 °C for the fuse cover, per IEC 60695-2-1. Protective treatment is TH (tropicalized) for humid environments.
Mechanical and electrical endurance
Mechanical durability: 10,000 cycles. Electrical durability: 1,000 cycles at AC-23A and AC-23B, and 200 cycles at DC-23A and DC-23B. These numbers are for the switch mechanism itself under load — expect lower life if switching near the rated maximum frequently. For infrequent isolation (e.g., once per shift), the mechanical life is generous.
Mounts on a plate or rail. Power circuit connections are via bars or screw terminals accepting 50 to 95 mm² flexible cable. Tightening torque is 12 N·m for both control and power circuit screw terminals. Dimensions: width 254 mm, height 162 mm, depth 157.5 mm — plan for panel space accordingly.