Fuses are the last line of defense in an electrical circuit that draws too much current. When the current reaches the rated level, the fuse opens and the current flow stops. A fuse can be described by its physical characteristics, voltage rating and current threshold. Axial and radial are terms that help describe the physical characteristics of a fuse.
Radial Fuses
Merriam Webster defines radial as "arranged or having parts arranged like rays." This also describes the radial fuse. The two leads of the fuse come out almost parallel from the fuse element. The leads appear to be radiating from the center of the fuse.
Axial Fuses
Merriam Webster defines axial as "of, relating to, or having the characteristics of an axis." This also defines the visual characteristics of an axial fuse, where the leads come straight out each end. The axial fuse leads come out on the fuse on the same axis.
Radial and Axial Applications
Applications for radial fuses tend to be associated with printed circuit boards. They can be installed by machine and occupy a small amount of real estate. Axial fuses tend to be used in applications where replacing the fuse is anticipated, and access is important.
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