The GS1NG4 is a TeSys GS fuse switch disconnector body — the main switching unit without the handle or fuses. It is a 4-pole, DIN-rail-mount device rated for 250 A at 400 V AC-23B, meaning it can make and break motor circuits under load at that current. This is a fuse switch disconnector body — it requires a separate operating handle (external left side) and the appropriate DIN fuses (size T1) to form a complete disconnecting switch.
Sourcing Reality — Obsolete, Sourced to Order
If your application allows a parametric substitute, a current-production TeSys GS fuse switch disconnector with the same pole count and current rating would be the practical replacement — but verify the mounting footprint and handle compatibility before committing the BOM.
The 250 A rating at 400 V AC-23B is the motor-switching duty class — it governs the real load this disconnector can handle when switching motors on and off under load. For DC applications, the rated operational current drops to 200 A at 440 V with two poles in series per phase. The short-circuit making capacity (Icm) is 100 kA at 400 V when protected by gG fuses, with a maximum associated fuse rating of 250 kA. This means the disconnector can close onto a fault up to 100 kA without damage, provided the upstream fuses are correctly sized. The IP20 protection (with terminal cover) means it is touch-safe in an enclosed panel but not suitable for washdown or outdoor exposure. Mechanical durability is rated at 10,000 cycles, and electrical durability at 1000 cycles for AC-23A and AC-23B duty. This is a robust industrial disconnect, not a daily-use switch — it is designed for infrequent operation as a maintenance or safety disconnecting means.
The GS1NG4 complies with IEC 60269-2 (fuse requirements), IEC 60947-3 (switch-disconnectors), and IEC 60269-1 (general fuse rules). The fuse cover is rated for 850 °C glow-wire test, and the body for 960 °C, per IEC 60695-2-1. Protective treatment is TH (tropicalized) for humid environments.