Maxi blade fuse (APX)
The maxi blade is the largest of the standard automotive blade fuse family. At 29.2 mm tall, it handles high-current circuits from 20 A to 100 A and is found in under-hood fuse/relay boxes for circuits like the alternator, main power feed, and ABS.
Specifications
| Property | Value |
|---|---|
| Standard designation | APX / Maxi (SAE J1284) |
| Overall height | 29.2 mm |
| Width | 26.0 mm |
| Blade spacing | 9.5 mm |
| Voltage rating | 32 V DC |
| Amperage range | 20 A to 100 A |
Color code
| Color | Amperage |
|---|---|
| Yellow | 20 A |
| Clear / White | 25 A |
| Green | 30 A |
| Red | 50 A |
| Blue | 60 A |
| Tan | 70 A |
| Clear | 80 A |
| Pink | 100 A |
Common applications
- Main battery feed circuits in passenger vehicles
- Alternator output protection
- ABS and stability control system feeds
- High-current accessories: winches, inverters, air compressors
- Under-hood relay and fuse boxes
Replacement considerations
Maxi fuses are typically accessible in an under-hood main fuse box rather than the cabin fuse panel. Always disconnect the negative battery terminal before replacing a maxi fuse to avoid arc flash from high-current circuits. Replace only with the matching amperage and a genuine-specification replacement.
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