If you're not up on your fuses, here's an overview of where they fit into automotive circuit protection. Uses and Types. According to "Fuseology" by Littelfuse" , the purpose of a fuse is to serve as a sacrificial device. Inside a fuse is a conductive strip of material that will melt if the fuse overloads, also called its "breaking capacity. In automotive electrical applications, the vast majority of fuses are "blade"-type fuses , constructed with two prongs that fit into a small plug.
However the use of bolt-down fuses has increased as more vehicles come equipped with accessories requiring higher current carrying capabilities, and cartridge fuses have grown popular in situations where smaller footprints are required for optimal use of space. Sizes and Amperages. Blade fuses provide protection for amperage ratings up to 80A. Bolt down fuses shown at left provide protection from 30A to A and are ideal for battery and alternator circuit protection.
Cartridge fuses shown at right offer increased time delay and low voltage drop protection and are typically designed in compact sizes to save on space and weight. They provide protection from 15A to 70A. All automotive fuses have their amperage written on the top of the fuse.
If you remove the cover of an automotive fuse box, it will be the first thing you see. Each level of amperage also has a specific color associated with it.
Blade type fuses use a universal color schema across manufacturers. However, for bolt down and cartridge fuses, the color schema can vary by manufacturer. Counterintuitively, amp rating does not necessarily correspond to fuse size. Regular-sized fuses start at. To avoid issues, anybody maintaining vehicles—including drivers who may be forced to make emergency repairs—should take care to match both size and color.
To select the right fuse amperage within a range, start by calculating your maximum and minimum fuse amperages and taking a number near the middle of the range. The fuse link is completely enclosed to help protect against moisture and other corrosive or damaging elements.
Available in amperage ratings up to 80A Transparent housing for easy identification of blown fuse Interrupting rating: A 58 DC. The JCase Low Profile fuse has a lower profile and shorter male blade terminals but performs the same as a standard JCase. They are designed to withstand higher temperatures for longer periods of time and are made for higher amperage circuits, such as alternators and starters. The cartridges can be male or female; the male terminal fuses have either bent or straight contacts that can be bolted down.
FMM Fuses are small female Maxi cartridge fuses that save space in vehicle fuse boxes. They offer protection for high current circuits. Blo-N-Glo Fuses Another option is the Blo-N-Glo fuse , which features a built-in light that glows when the fuse is blown, saving you the time of removing and checking every fuse to find the problem. To ensure your shop always has the fuses you need,.
Have a Question For Us? Byron Moderator. I've been searching for a fuse holder for the bike. I want to stay with the ATM size fuses. When I was installing my cruise control it had an inline fuse holder for a 3 amp ATC fuse. I wanted to see if the ATM size fuse would fit, it did. That brings me to my question. Patiently awaiting. Tim MOTM. I am waiting for the one that will be coming out soon from Powerlet.
Tim, Is there a link available for the info? No link yet, but I will post one here when it is available. I haven't tried it, but I did look at the drawings in Bussmann's catalog.
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