Is this wiring that was done by the electrician in the field? The inline fuseholders I've used have had pigtails on them, which I don't see here. I'd be willing to bet that the label on the cover says to disconnect the unit from the power supply before opening the unit. A guy would have an excellent chance of a shock if he tried to change that fuse without shutting off the supply to it anyway. Even inspectors should read the warning labels.
