Blue Sea Systems
Marine circuit protection, fuse holders, battery switches, busbars, and electrical distribution components designed for dependable boat systems.
Blue Sea Systems develops dependable AC and DC electrical products for marine and specialized vehicle applications. The brand is known for practical solutions across circuit protection, power distribution, switching, and system monitoring. The Common Ground Marine selection currently focuses on Blue Sea Systems marine fuses and fuse holders, including ANL, MEGA, MAXI, Class T, and MRBF formats. Compare voltage, amperage, fuse style, and holder compatibility to protect the complete electrical circuit.
Products from Blue Sea Systems
206 products
Blue Sea SystemsBlue Sea Systems M2 DC Voltmeter
M2 DC voltmeter, monitors up to 4 battery banks, 8-70V range, IP66 rated. Auto-dimming OLED display with adjustable high/low voltage alarms.
SKU BLUE-1833
$226.80MSRP $272.16
Blue Sea SystemsBlue Sea Systems MAXI Fuse - 40 Amp
MAXI Fuse - 40 Amp. Economical. Tin-plated connector blades for corrosion resistance.
SKU BLUE-5139
$5.60MSRP $6.72
Blue Sea SystemsBlue Sea Systems MAXI Fuse 50A 32V DC
Blue Sea Systems 50A MAXI Fuse for 32V DC branch circuit protection, with tin-plated blades and a visible blown indicator. One fuse per package.
SKU BLUE-5140
$5.60MSRP $6.72
Blue Sea SystemsBlue Sea Systems MAXI Fuse 60A 32V DC
Blue Sea Systems 60A MAXI Fuse for 32V DC branch circuit protection, with tin-plated blades and a visible blown indicator. One fuse per package.
SKU BLUE-5141
$5.60MSRP $6.72
Blue Sea SystemsBlue Sea Systems MAXI Fuse 70A 32V DC
Blue Sea Systems 70A MAXI Fuse for 32V DC branch circuit protection, with tin-plated blades and a visible blown indicator. One fuse per package.
SKU BLUE-5142
$5.60MSRP $6.72
Blue Sea SystemsBlue Sea Systems MAXI Fuse 80A 32V DC
Blue Sea Systems 80A MAXI Fuse for 32V DC branch circuit protection, with tin-plated blades and a visible blown indicator. One fuse per package.
SKU BLUE-5143
$5.60MSRP $6.72
Blue Sea SystemsBlue Sea Systems ML Series Link Bus
ML Series Link Bus, tin-plated copper, 500A continuous rating. Parallels multiple ML-Series RBS, solenoid, and ACR switches together as needed.
SKU BLUE-9160
$16.10MSRP $19.32
Blue Sea SystemsBlue Sea Systems MRBF Terminal Fuse 250A 58V DC
250A ignition-protected battery fuse for main DC circuit protection on large battery banks. Requires a Terminal Fuse Block (PN 5191 or 2151).
SKU BLUE-5189
$16.10MSRP $19.32
Blue Sea SystemsBlue Sea Systems MRBF Terminal Fuse Block 30-300A
Single-position MRBF fuse block, 300A / 58V DC max. Mounts directly on any 3/8in battery post, switch terminal, or bus bar stud. MRBF fuse sold separately.
SKU BLUE-5191
$26.60MSRP $31.92
Blue Sea SystemsBlue Sea Systems MaxiBus 250A BusBar Two 5/16in-18 Studs and Twelve Screws
MaxiBus 250A busbar, two 5/16in stud terminals plus twelve #10-24 screw terminals. Rated 300V AC / 48V DC max. Raised bus for easy wire access.
SKU BLUE-2105
$69.30MSRP $83.16
Blue Sea SystemsBlue Sea Systems Mini OLED Ammeter, Blue
Mini OLED ammeter, Blue, monitors -100A to 100A DC range. Includes a 100A shunt. Mounts in a 1-1/8in hole, positive or negative side wiring.
SKU BLUE-1732200
$72.10MSRP $86.52
Blue Sea SystemsBlue Sea Systems Mini PowerPost 1/4in-20 Stud without Cap
Mini PowerPost, 1/4in-20 stud, 48V DC max, sold without an insulator cap included. Compact single-stud connector for space-limited installations.
SKU BLUE-2014B
$5.88MSRP $7.06
Blue Sea SystemsBlue Sea Systems PowerBar 600A BusBar Eight 3/8in-16 Studs
PowerBar 600A busbar, eight 3/8in stud terminals, 545A AC / 600A DC continuous rating. For large-scale high-amp consolidation on bigger boats.
SKU BLUE-2107
$152.60MSRP $183.12
Blue Sea SystemsBlue Sea Systems Solenoid L-Series - 250A 12/24V
Solenoid L-Series - 250A 12/24V. Continous duty, SPST - Normally Open. Hermetically sealed contacts / vaporproof.
SKU BLUE-9012
$233.80MSRP $280.56
Choose the right Blue Sea Systems fuse
Start with system voltage, expected continuous current, conductor size, and the manufacturer's specified overcurrent protection. Then select the fuse family, amp rating, and a compatible holder or terminal block. Match the fuse to the holder and confirm the available interrupt rating and installation clearances.
Browse circuit protectionMarine circuit protection starts with the whole DC system
Blue Sea Systems offers several fuse formats for different installation and service requirements. Compare the electrical specification, physical format, and mating holder before ordering a replacement or building a new system.
- ANL, MEGA, MAXI, Class T, and MRBF fuse formats
- Fuse holders and terminal solutions for organized power distribution
- Guidance on voltage, amperage, conductor sizing, and compatibility
Frequently asked questions
What does Blue Sea Systems make?
Blue Sea Systems designs AC and DC electrical products for marine and specialized vehicle applications. The current selection includes marine fuses and a fuse holder for circuit protection and power distribution.
How do I choose a Blue Sea Systems marine fuse?
Confirm the system voltage, required amperage, conductor size, fuse type, holder compatibility, and the protection requirements specified by the equipment manufacturer. The fuse must be appropriate for the complete circuit, not just the load.
What is the difference between ANL, MEGA, MAXI, Class T, and MRBF fuses?
These are different fuse formats with different physical sizes, holders, ratings, and installation requirements. Use the product documentation and your system design to select the correct format and verify that the fuse and holder are a compatible pair.
Need a quote on Blue Sea Systems gear?
Tell us what you're building. Our team will spec the right kit for your install and send a written quote.
Why buy from us
We carry this brand because it earns its place on the boat.
Stocked for marine builds
We focus on parts that meet the conditions boats see — not just whatever ships fastest.
Engineering review on request
Send a parts list or a layout and we'll check it against your boat before you order.
Direct from our team
Pricing, availability, and product questions all go through the same people who build custom harnesses and panels.