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Anatomy

This slide is meant to coalesce around similar terminology for such products – some terms and objects are unique to different styles of fuse holders, but common terms can be used to describe similar components of different fuse holders. Left to right, there are labeled characteristics that will help assess and describe a fuse holder. First is the mounting related to the fuse itself. Describing how a fuse is inserted into a holder uses terms like ‘bolt-down’ or ‘press-fit’ or ‘insert.’ These are generalities that correspond to bolt-down or terminal fuses, respectively. This term is dictated by the actual fuse in the holder. As an example, the phrase ‘bolt-down ATO’ would not be used because it is a bladed fuse. Ultimately this descriptor is synonymous with the fuse itself. Secondly is the housing. The housing is the case or container in which the fuse resides. This is often described by the material it is made up itself, saying such phrases as “overmolded housing” or “diecast housing” are appropriate, and are easily told by observing the outside composite of the holder. Loosely, this is related to fuse current. The higher amperage protection required usually means the type of material will become more robust. This is not definitive, but generally speaking, expect that higher current fuses will see housings that are made of a higher composite plastic or stamped metal housings. Lastly is the mounting and termination of the holder itself. This describes the manner in which the holder is integrated into the circuit it is protecting. Using adjectives like ‘inline’, ‘bracket’, or ‘battery-mount’ help to understand what type of setting the holder is being placed in. This is largely related to environment and application. Fuse types are fairly agnostic of mounting, as location and application of the holder will dictate the type of mounting available.

PTM Published on: 2022-04-13