Ok now it works well. I had to replace the “Fusible Status” Array with a Fuse references array in the construction script.
Then in event graph, when “Check Code” function is called, for each Fuse reference, the “On?” variable is added to “Fusible Status” Array.
This way the “Fusible Status” array is dynamically updated each time a Fuse is modified in-game (fuses call the “Check Code” function when their status is changed).