Micro 2 fuse set: 2 x 5A 2 x 10A 2 x 15A 2 x 20A 2 x 25A Car fuses are used to protect electrical system circuits against overloads. After the fuse has tripped, the cause of the installation overload should be diagnosed and removed, and then the fuse should be replaced with a new one with the same tripping current.