Can an axial leaded glass-body fuse be mounted vertically?

Thread Starter

Younes Thabet

Joined Jan 9, 2019
Hello all,

I am designing a PCB containing a power supply with a very limited space so I can't use a 5x20mm cartridge fuse or even 5x15mm ones. The only available solution is to use axial leaded fuse mounted vertically!! so is it okey to mount a fuse vertically!? and does it affect PSU efficiency!?
Also I tried using fusible resistors and I have been told that it would cause compliance issues with my product?



Joined Jul 10, 2017
Is the fuse to be mounted vertically on a horizontal board or a vertical one?
I see no reason why the orientation of the fuse would affect the efficiency of a power supply.
If it is mounted on one end with the other lead bent back parallel to the body. The only concerns would be physical stability and a need to insulate the exposed lead to prevent it from shorting out the fuse.


Joined Sep 24, 2015
Yes, you can mount them vertically and no, it doesn't affect the PS. However, I don't understand why fusible resistors (I've not heard of them before) would cause a "compliance" issue.