The Schneider Electric GS1AV54 is a fuse cover interlock kit from the TeSys range, designed for 4-pole fuse holders accepting DIN/NFC size 1 fuses up to 250 A. It is a locking accessory that prevents access to the fuse compartment while the circuit is live — a safety interlock for panel builders and maintenance teams working on motor control centers or distribution boards.
Rated at 250 A, the interlock kit matches the current capacity of the fuse holder it secures — sized for the same branch circuit. The 4-pole configuration covers three-phase plus neutral applications common in European-style distribution. The DIN/NFC fuse size 1 interface means it accepts standard 22 × 58 mm fuse links, so verify your existing fuse-holder footprint before specifying.