The fuse is used as a sacrificial device. A conductive strip of material inside a fuse melts if it is overloaded, which is also known as its "breaking capacity." The fuse "opens" the circuit to protect the larger system if a system overloads or shorts.

The great majority of fuses used in automotive electrical applications are "blade" fuses, which have two prongs that fit into a tiny plug. However, as more vehicles are equipped with equipment that require higher current carrying capacities, the use of bolt-down fuses has increased, while cartridge fuses have grown in popularity in instances where smaller footprints are necessary for best space use.

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Sizes and Amperages:
Blade fuses are available in six sizes, from smallest to largest: Micro2, Micro3, Low Profile MINI, ATO/ATC (sometimes known as "standard"), and MAXI or MAX. Blade fuses protect against amperage values of up to 80A.

Bolt down fuses offer protection ranging from 30A to 600A and are perfect for protecting battery and alternator circuits. They are referred to as "bolt down" because they must be fastened to a fuse holder by a screw, nut, or bolt.

Cartridge fuses provide increased time delay and low voltage drop protection while being constructed in compact sizes to reduce space and weight. They offer 15A to 70A of protection.

The amperage of all automobile fuses is marked on the fuse's top. It will be the first thing you see if you remove the cover of an automotive fuse box. Each amperage level is likewise connected with a specific colour. Manufacturers of blade type fuses employ a common colour scheme. The colour schema for bolt down and cartridge fuses, on the other hand, can vary by manufacturer. A clear-colored MINI fuse, for example, represents 25A, whereas clear in a MAXI fuse represents 80A.

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Contrary to popular belief, amp rating does not always match to fuse size. Regular-sized fuses start at 0.5A and continue up to 40A, whereas Micro2 fuses range from 5A to 30A. To avoid problems, anybody who maintains vehicles, including drivers who may be required to make emergency repairs, should match both size and colour.
Operating Temperature:
To reduce nuisance blowing, the current rating of a fuse is normally derated by 25% during operation at 25°C (77°F). Remember that as your working temperature rises beyond 25°C (77°F), fuses will react faster, and as temperatures fall, fuses will react slower.
Installing and Replacing Fuses:
Once a fuse element has broken, it cannot be reused. A fuse can blow for a variety of causes, including an electrical system short, frayed wiring, a conductor exposed to the elements, or an electrical equipment failing and overloading the circuit. If a fuse blows repeatedly, it's a warning that you should look for a short or an overload.

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The most important thing to remember while inserting an automobile fuse is to turn off the vehicle; otherwise, arcing may occur. Remember that fuses exist in a variety of materials and amperages.