The GS1SD3 is a TeSys GS fuse switch disconnector body — the main switching unit for a 3-pole, DIN-rail-mounted fusible disconnect. It's the part that carries the current and breaks the circuit; you add the fuse links and handle assembly separately. The operational current depends on duty and voltage: 630 A at 400 V AC-23B (motor switching with occasional inrush), 500 A at 500 V AC-23B, and 315 A at 690 V AC-23B. For DC circuits with poles not juxtaposed, it's rated 630 A at 440 V DC-23B.
Breaking and making — the fault-handling numbers that matter
Making capacity is 6300 A at the same rating, meaning it can close onto a fault without welding contacts. With upstream gG (general-purpose) fuses rated at 630 A, the short-circuit making capacity jumps to 100 kA at 400 V — the fuses do the heavy lifting for high-fault scenarios, and the switch just has to hold together until they clear. Rated insulation voltage is 1000 V AC, and impulse withstand voltage is 12 kV — that covers 690 V systems with margin for transient spikes common in industrial motor circuits.
Build and mounting details
Power connections are via bars or screw terminals, each accepting up to two 300 mm² flexible conductors. Torque to 44 N·m on the power circuit terminals. IP20 with the terminal cover fitted — finger-safe but not washdown. The operating handle is on the right side. Fuse size is T3, DIN type, so standard 3-pole DIN fuse links fit. Fire resistance tested to 850 °C on the fuse cover and 960 °C on the body per IEC 60695-2-1 — that's the glow-wire test for flammability in a fault condition.
It's a fuse switch disconnector body, so you'll also need the matching handle and fuse links to complete the assembly. The GS1S family is well-stocked through distribution; this is a line item you can quote to order without worrying about allocation.