I have come across several occasions on this website where a circuit is shown with a fuse on the neutral wire rather than the line wire of mains power. For example
from this question.
I can think of good reasons why the fuse should be on the line side. If a fuse on the neutral side blows, and the building does not have ground fault protection devices, then current could still flow from the line to the ground. [Of course, if the fuse were on the line side, and it blows, current could flow between neutral and ground, but the voltages are much smaller] So, it would seem that a line side fuse offers more protection than a neutral side fuse.
On the other hand, I can't see any advantage to fusing the neutral side rather than the line side.
Of course some particular circuit might be fully enclosed in an insulating container. While that, at least somewhat, counters the safety argument for fusing the line side, it doesn't seem to provide any benefits to fusing the neutral side rather than the line side.
So, my question is, am I missing something? Is there any reason to fuse the neutral side rather than the line side? Or are those who designed these circuits just missing an opportunity to make their circuits possibly safer with no compensating benefit?