Interpreting the Secrets of Automotive Fuses

Although fuses are inconspicuous in daily use, a vehicle without a fuse will become a pile of soulless scrap metal, because vehicle electrical equipment such as lights, horns, starters, and air conditioning all require fuse protection. Otherwise, if the current in the circuit is too high, it is likely to cause the electrical appliances to burn out. Now that we know the important role of fuses, if one day the vehicle components break down, don’t rush to replace them. We can first see if there is a problem with the fuses.

What is a car fuse?

A fuse is just our usual name, its true name is “fuse”. Its main function is to fuse when the circuit current is abnormal or exceeds its rated current by more than twice, playing a role in circuit protection.

car fuse

A fuse has two important parameters, one is the rated current; The other is the rated voltage. When using, choose the corresponding specification of fuse based on its current and voltage.

Car fuses are divided into high current fuses and medium low current fuses. The most common type of fuse in general vehicles is the medium and low current fuse, which is further divided into plug-in fuse, cross bolt fuse, screw on fuse, and tube fuse. The ones we most often come into contact with are medium and small fast melting plug-in fuses. Today we will mainly talk about plug-in fuses.


The specifications of automotive plug-in fuses are generally 2A to 40A, and the ampere value will be indicated at the top of the fuse. In addition to judging the ampere value by looking at the markings on the top of the fuse, we can also judge it by the color of the fuse. Different colors represent different ampere values. The international standards are: 2A gray, 3A purple, 5A orange yellow, 7.5A coffee color, 10A red, 15A blue, 20A yellow, 25A colorless transparent, 30A green, 35A light purple, 40A deep orange.



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