When repairing an RV's battery or inverter fuse connection, match the fuse family as well as the amp rating. Blue Sea's 2151 dual MRBF, 5001 MEGA/AMG and 5005 ANL holders use different physical fuses. They are not interchangeable solely because each protects a positive DC cable. These part-by-part references help identify the correct holder or replacement cartridge before ordering.
Three fuse-holder formats you may find in a battery compartment
2151 — Dual MRBF
For separate correctly sized DC output circuits. MRBF terminal fuses fit the 2151 holder; a separate fuse is required for each protected branch.
5001 — MEGA/AMG
A different fuse body and mounting geometry from MRBF or ANL. Inspect the exact block number, studs, cover and fuse rating.
5005 — ANL
For compatible ANL DC protection. Similar amperage markings do not mean a MEGA, MRBF or Class T fuse will fit.
Blue Sea 2151, 5001 and 5005 at a glance
| Model | Fuse format | Main selection detail | Included fuse? |
|---|---|---|---|
| 2151-BSS | Dual MRBF terminal | 58V DC listing voltage; two separate MRBF positions | No |
| 5001-BSS | MEGA / AMG | 32V DC / 300A listing rating; covered bolt-down holder | No |
| 5005-BSS | ANL | 32V DC / 300A listing rating; covered ANL holder | No |
A replaceable Blue Sea 5184BSS cartridge is a 125A MRBF terminal fuse, intended for the appropriate 2151 or 5191 MRBF holder arrangement. It is not the correct physical format for the 5001 or 5005. The fuse's own voltage rating, interrupt rating and current rating must also suit the battery system.
View matching holder and fuse photographs
Each card links to its exact-number listing on UsedRVParts. Review the product for current availability; qualifying used parts can be viewed or collected by appointment in Kelowna.
Original Blue Sea installation references
Use the manufacturer's 2151 dual MRBF holder information, 5001 MEGA/AMG specifications and 5005 ANL fuse-block reference. These provide the exact construction, connection details and relevant approval limits.