Automotive blade fuses follow a universal color code by amperage, so you can identify a rating at a glance. This applies to standard (ATO/ATC), mini, and low-profile blade fuses alike.
| Amperage | Color |
|---|---|
| 2 A | Gray |
| 3 A | Violet |
| 5 A | Tan |
| 7.5 A | Brown |
| 10 A | Red |
| 15 A | Blue |
| 20 A | Yellow |
| 25 A | Clear / natural |
| 30 A | Green |
| 40 A | Amber / orange |
Never upsize a fuse. A fuse protects the wiring, not the device. Replacing a 15 A with a 20 A lets the wire overheat before the fuse blows — a fire risk. Match the rating exactly.
Size a circuit with the Fuse Size calculator in the automotive calculators.