When replacing a Blue Sea fuse holder, identify the fuse format before comparing its overall shape. A four-, six- or twelve-circuit ST Blade block is not the same as an in-line glass-fuse holder or an MRBF battery-terminal block. The part number also determines whether an insulating cover or negative bus is present.
Recognize the fuse holder's job
Distribute several fused accessory circuits from a common supply. Available in this selection with or without negative buses.
A single glass-fuse holder that is installed along a suitable protected conductor, not a multi-circuit panel.
Mounts a marine-rated high-current fuse near an appropriate battery or distribution connection.
Blue Sea 5024–5030 identification table
Check the connection location, number of circuits, integrated negative bus and cover before replacing the unit.
| Blue Sea model | Design | Circuits | Fuse style | Negative bus | Cover |
|---|---|---|---|---|---|
| 5024 | Battery-terminal ST Blade kit | 4 | ATO/ATC blade | Negative bus included | Yes |
| 5025 | ST Blade with negative bus | 6 | ATO/ATC blade | Yes | Yes |
| 5026 | ST Blade with negative bus | 12 | ATO/ATC blade | Yes | Yes |
| 5028 | ST Blade, positive distribution | 6 | ATO/ATC blade | No | Yes |
| 5029 | ST Blade, positive distribution | 12 | ATO/ATC blade | No | Yes |
| 5030 | ST Blade with negative bus | 6 | ATO/ATC blade | Yes | No |
5024 is a special battery-stud-mounted four-circuit kit, not the same mounting format as a screw-mounted fuse block. The base manufacturer part numbers appear with a -BSS suffix in these store listings.
Identify single-fuse holders
| Blue Sea model | Design | Fuses held | Fuse type | Return bus | Protection |
|---|---|---|---|---|---|
| 5062 | Waterproof in-line fuse holder | 1 | AGC / MDL glass | N/A | Enclosed holder |
| 5191 | Battery-terminal MRBF holder | 1 | MRBF terminal fuse | N/A | Insulating cap |
5062 supports AGC/MDL glass fuses and 12–16 AWG connections, while 5191 requires a compatible MRBF terminal fuse. Neither is a multi-circuit ATO/ATC panel.
Check the original fuse system
Read the original manufacturer's part number and inspect the circuit wiring before replacing a fuse holder. Match fuse format, conductor gauge, mounting and required current/voltage ratings. Do not replace a fuse with a higher amperage simply because the holder permits it.
Choose the actual ATO/ATC, AGC/MDL or MRBF fuse separately to match the equipment and conductor-protection requirements. The 5191 holder's 300 A rating does not mean a 300 A fuse is suitable for every installation.
Compare the matching Blue Sea listings
Select the MPN to review its listing, condition and current availability.
Blue Sea 5024
Identify by fuse format and mounting style. Mounts at a compatible 3/8-inch battery stud; terminal-mount kit, not a conventional remote fuse panel.
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Blue Sea 5025
Identify by fuse format and mounting style. Six fused branch circuits with an integrated negative return bus and insulating cover.
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Blue Sea 5026
Identify by fuse format and mounting style. Twelve fused positions with a negative bus and protective cover.
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Blue Sea 5028
Identify by fuse format and mounting style. Covered six-circuit blade fuse block without an integrated negative bus.
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Blue Sea 5029
Identify by fuse format and mounting style. Covered twelve-circuit ATO/ATC block; no built-in negative return bus.
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Blue Sea 5030
Identify by fuse format and mounting style. Six fused circuits and a negative bus, supplied without the cover found on 5025.
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Blue Sea 5062
Identify by fuse format and mounting style. In-line AGC/MDL fuse holder for 12–16 AWG wire, with a maximum fuse rating of 20 A.
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Blue Sea 5191
Identify by fuse format and mounting style. Holder for a separately purchased marine-rated battery fuse; 58 V DC maximum and up to 300 A holder rating.
Review item details and availabilityRelated marine electrical references
Identify marine battery switches and covers · Identify Ancor ring terminal hardware
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