someone recently reported a similar issue on our discord, and said they were able to get the fuse box to work as intended by finishing 'a short fuse'! where are you stuck?
you need to combine the broken cable with an electrical tape!
for the latter, first you must place a random consumable (e.g. lollipops from the vending machine, laundry detergents from your lunch box) on the utmost left student desk in the english classroom, then wait a day and check it again.