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 10A Push Button LED Ring Switch OFF-ON Blue
10A Push Button LED Ring Switch OFF-ON Blue. 10A continuous. Single Pole Double Throw or Single Pole Single Throw.
SKU BLUE-4160BLUE
$25.90MSRP $31.08
Blue Sea SystemsBlue Sea Systems 10A Push Button LED Ring Switch OFF-ON Red
10A Push Button LED Ring Switch OFF-ON Red. 10A continuous. Single Pole Double Throw or Single Pole Single Throw.
SKU BLUE-4162RED
$25.90MSRP $31.08
Blue Sea SystemsBlue Sea Systems 12 Volt Plug
12V DC accessory plug, fits any standard cigarette-lighter-style socket. Includes a built-in 10A fuse. Wire leads for connecting to a device or cable.
SKU BLUE-1010
$11.20MSRP $13.44
Blue Sea SystemsBlue Sea Systems 12/24V DC Dual USB Charger 4.8A Socket Mount
Dual USB charger, 4.8A total output, 12/24V DC input, intelligent device recognition for rapid charging. Mounts in a common 1-1/8in socket hole.
SKU BLUE-1045
$46.20MSRP $55.44
Blue Sea SystemsBlue Sea Systems 12/24V DC Dual USB Charger 4.8A Switch Mount
Dual USB charger, 4.8A total output, 12/24V DC input. Mounts directly in a Contura switch panel cutout, 1.45in x 0.83in, no drilling needed.
SKU BLUE-1039B
$44.80MSRP $53.76
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Panel Mount 100A
187-Series Circuit Breaker - Panel Mount 100A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7044
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Panel Mount 135A
187-Series Circuit Breaker - Panel Mount 135A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7047
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Panel Mount 60A
187-Series Circuit Breaker - Panel Mount 60A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7040
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Panel Mount 90A
187-Series Circuit Breaker - Panel Mount 90A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7043
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Surface Mount 150A
187-Series Circuit Breaker - Surface Mount 150A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7148
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Surface Mount 70A
187-Series Circuit Breaker - Surface Mount 70A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7141
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 187-Series Circuit Breaker - Surface Mount 80A
187-Series Circuit Breaker - Surface Mount 80A. Combines switching and circuit protection into a single device*. Clear, single lever operation.
SKU BLUE-7142
$88.20MSRP $105.84
Blue Sea SystemsBlue Sea Systems 285-Series Circuit Breaker - Panel Mount 100A
285-Series Circuit Breaker - Panel Mount 100A. Drop in replacement for 185-Series Circuit Breakers. Visible reset lever shows open condition.
SKU BLUE-7087B
$52.00MSRP $62.40
Blue Sea SystemsBlue Sea Systems 285-Series Circuit Breaker - Surface Mount 50A
285-Series Circuit Breaker - Surface Mount 50A. Drop in replacement for 185-Series Circuit Breakers. Visible reset lever shows open condition.
SKU BLUE-7183
$56.00MSRP $67.20
Low stock · 1 leftBlue Sea SystemsBlue Sea Systems 300A / 50mV Current Shunt
300A current shunt with a 50mV output at rated current.
SKU BLUE-9235
$42.75MSRP $57.00
Blue Sea SystemsBlue Sea Systems A-Series Circuit Breaker Toggle Guard
A-Series Circuit Breaker Toggle Guard. Protects circuit breakers from being accidentally switched ON or OFF. Fits all A-Series single pole circuit breakers.
SKU BLUE-4100
$4.20MSRP $5.04
Blue Sea SystemsBlue Sea Systems AC Analog Ammeter 0-100A with Coil
AC analog ammeter, 0-100A display range, includes an AC current transformer clip-on coil. Simple 2-wire connection, backlit face, 2-3/4in dial.
SKU BLUE-8258
$65.80MSRP $78.96
Blue Sea SystemsBlue Sea Systems AC Current Transformer - 150A AC/50mA AC
AC Current Transformer - 150A AC/50mA AC. For use with AC Ammeters.
SKU BLUE-8256
$25.90MSRP $31.08
Blue Sea SystemsBlue Sea Systems AC Digital Ammeter - 0 to 150A
AC Digital Ammeter - 0 to 150A. Displays amperage from 0 to 150 Amps. 3 levels of display brightness.
SKU BLUE-8238
$265.30MSRP $318.36
Blue Sea SystemsBlue Sea Systems AC Digital Frequency Meter - 40 to 90 Hertz
AC Digital Frequency Meter - 40 to 90 Hertz. Displays frequency from 40 to 90 Hertz. 3 levels of display brightness.
SKU BLUE-8239
$217.70MSRP $261.24
Blue Sea SystemsBlue Sea Systems AC Digital Multi-Function Meter with Alarm
AC digital multi-function meter, displays 0-150A, 80-270V, 0-35kW, 40-90Hz range. High/low voltage alarms, sleep mode for power conservation.
SKU BLUE-8247
$308.70MSRP $370.44
Blue Sea SystemsBlue Sea Systems AC Isolation Cover, 5-1/4in x 7-1/2in x 3in
AC Isolation Cover, 5-1/4in x 7-1/2in x 3in, protects exposed panel backs from accidental contact. Meets ABYC requirements for combined AC/DC circuit breaker panels.
SKU BLUE-4027
$40.60MSRP $48.72
Blue Sea SystemsBlue Sea Systems AC Isolation Cover, 7-1/2in x 10-1/2in x 3in
AC Isolation Cover, 7-1/2in x 10-1/2in x 3in, protects exposed panel backs from accidental contact. Meets ABYC requirements for combined AC/DC circuit breaker panels.
SKU BLUE-4028
$107.80MSRP $129.36
Blue Sea SystemsBlue Sea Systems AMG Fuse 125A 70V DC
125A AMG fuse for economical 100-300A DC circuit protection, 70V DC maximum, ignition protected. Use with a Blue Sea AMG Fuse Block, sold separately.
SKU BLUE-5102
$9.10MSRP $10.92
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.