Exterior Components› Body Panels and Components
BLUE SEA
FUSE A3T (CLASS T) 400 AMP
SKU: B03C 5121-BSS
Easy — 1–2 hours
Description
This fuse is rated for 400 amps and a maximum voltage of 125V DC. It has a stud size of 3/8" and is DC tested to UL standard 198L, meeting UL standard 248-15.
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | BLUE SEA |
| Part Number | B03C 5121-BSS |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
View Full Return Policy