What the ratings mean for fit
The GS1GBR4 is a 4-pole fuse switch disconnector body from the TeSys GS range, rated 63 A at 400 V AC-23B (switching motor loads) and 500 A breaking capacity in that duty class — the AC-23B rating is the one that governs real motor-switching use, not the thermal current. It accepts BS-type fuses in size A2/A3, and the making capacity at 400 V AC-23B is 630 A — meaning it can close onto a faulted motor circuit up to that level without welding contacts. The short-circuit withstand is 80 kA, and with BS fuses rated 63 A the rated short-circuit making capacity reaches 100 kA at 400 V — this lets the disconnector sit upstream of smaller branch fuses and still clear a high-energy fault.
Lifecycle reality — obsolete, but sourced
Schneider lists the GS1GBR4 as obsolete — no longer in active factory production. For a BOM line that needs this exact part, the supply path is through independent distribution surplus channels. Availability and pricing are confirmed at RFQ against the specific quantity; no stock-holding claim is made here.
Mounting and integration constraints
Mounts on plate or rail — the body is 6.3 in (161 mm) wide, 4.7 in (120.5 mm) high, and 3.6 in (92.5 mm) deep, so it fits a standard 200 mm deep enclosure with room for cable bending behind the panel. Power circuit terminals accept 10…25 mm² flexible wire with screw clamping at 3.2 N·m; the operating handle is on the right side, which matters when ganging multiple disconnectors in a row. IP20 with the terminal cover fitted (IEC 60529) — finger-safe but not washdown; the body passes the glow-wire test at 960 °C (IEC 60695-2-1), so it meets the fire-resistance requirements for panel interiors.
Durability and environmental range
Mechanical durability is 10,000 cycles; electrical durability is 1,500 cycles in AC-23A and AC-23B, and 300 cycles in DC-23A and DC-23B — the DC rating is significantly lower, so if the circuit is DC, plan for more frequent replacement. Operates from -20 °C to +70 °C ambient, with protective treatment TH (tropicalized) against humidity and corrosion — suitable for non-condensing environments like pump houses or light industrial floors.