The Schneider Electric GS1AV53 is a fuse cover interlock kit from the TeSys GS range, designed for 3-pole fuse holders rated at 250 A. It's a locking accessory that prevents access to the fuse compartment while the circuit is live — a standard safety interlock for panel builders who need to meet isolation requirements.
Rated for 250 A continuous, this kit matches fuse holders sized for that current class. The 3-pole configuration covers three-phase circuits. It accepts NFC DIN fuses in size 1 — that's the standard French/European cartridge fuse form factor common in industrial distribution panels. If your existing fuse holder is a TeSys GS1 or similar 3-pole 250 A base, this interlock cover bolts on directly.
Mounts directly onto the TeSys GS1 fuse switch disconnector base. The interlock mechanism engages when the cover is closed, preventing the fuse carrier from being withdrawn while the switch is on. No extra wiring — it's a mechanical interlock, not an electrical one. Verify the fuse holder model matches the 250 A 3P footprint before ordering.