Blue Sea Systems
Upgrade your power system with Blue Sea Systems—a leading name in AC and DC electrical components for marine, campervan, and motorhome applications. Designed for durability and performance, these high-quality products keep your power running efficiently, no matter where your adventures take you. Plus, with industry-leading warranties, you can buy with confidence.
41 Products Found
£16.43
Blue Sea 5189 Fuse Terminal 250A
Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151?do not mount the fuse directly to the battery terminal. Interrupt rating satisfies ABYC requirements for DC Main circuit protection on large battery banks. Ignition protected?safe for installation aboard gasoline powered boats. Clear window?visual indication of blown condition. Color coded for each amperage
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£16.43
Blue Sea 5185 Fuse Terminal 150A
Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151?do not mount the fuse directly to the battery terminal. Interrupt rating satisfies ABYC requirements for DC Main circuit protection on large battery banks. Ignition protected?safe for installation aboard gasoline powered boats. Clear window?visual indication of blown condition. Color coded for each amperage
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£45.99
Blue Sea 5025 BS5025 Fuse Block ST Blade 6 Circuits
ST Blade Fuse Block - 6 Circuits with Negative Bus and Cover BS5025 Blue Sea 5025
These units are not supplied with labels
Consolidates branch circuits and in-line fuses
Positive distribution bus with #10-32 stud
Can be used for 24-hour circuits
Models available with or without a cover
Cover satisfies ABYC/USCG requirements for insulation, incorporates an easy to open push button latch providing easy access to fuses, storage for two spare fuses, and label recesses that accept Blue Sea Systems" Small Format Labels for circuit identification
Tin-plated copper buses and fuse clips
Accepts ring or snap fork type terminals
Accepts ATO® and ATC® fast acting blade fuses
Fuses sold separately
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£37.39
Blue Sea 2127 BS2127 MaxiBus 4x5/16 Stud Common
MaxiBus 250A BusBar - Four 5/16"-18 Studs BS2127 Blue Sea 2127
Busbars are used to consolidate multiple wires or feed multiple circuits
Insert molded stainless steel studs eliminate need for securing nut and allow high torquing for excellent electrical contact
Raised bus provides easy access to multiple wires on a single stud
UL 94-V0 rated base material resists high heat
Recessed mounting holes eliminate accidental shorts to aluminum and steel mounting surfaces
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£16.43
Blue Sea 5183 Fuse Terminal 100A
Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151?do not mount the fuse directly to the battery terminal. Interrupt rating satisfies ABYC requirements for DC Main circuit protection on large battery banks. Ignition protected?safe for installation aboard gasoline powered boats. Clear window?visual indication of blown condition. Color coded for each amperage
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£14.49
Blue Sea 5187 BS5187 Fuse Terminal 200A
MRBF Terminal Fuse - 200A BS5187 Blue Sea 5187
Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151—do not mount the fuse directly to the battery terminal
Interrupt rating satisfies ABYC requirements for DC Main circuit protection on large battery banks
Ignition protected—safe for installation aboard gasoline powered boats
Clear window—visual indication of blown condition
Color coded for each amperage
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£35.49
Blue Sea 6006 BS6006 Switch Battery m-Series ON/OFF With Knob
m-Series Mini On-Off Battery Switch with Knob - Red BS6006 Blue Sea 6006
Switches a single battery to a single load group
Ignition protected—safe for installation aboard gasoline powered boats
Case design allows surface, front panel, or rear panel mounting
Isolating cover with snap-on sections protects rear contacts
View all Blue Sea M-Series Battery Switches
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£13.99
Blue Sea 1011 Systems BS1011 12V DC Dash Socket
Blue Sea Systems 12VDC Dash Socket Blue Sea 1011 BS1011
Features watertight cap, easy installation, and twist locks securely with plug
Designed to withstand the rigors of wet environments and constant vibration
Large contact surfaces for good electrical connection
Twist lock system—plug locks securely into socket
Internal strain relief and cord seal
Nickel plated copper alloy used for all current carrying components
Front panel, rear panel, or surface mount
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£11.81
Blue Sea Systems 1010 12V DC Cigar Plug BS1010
Blue Sea Systems 1010 12V DC Plug BS1010
12VDC Plug Blue Sea BS1010
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£15.55
Blue Sea 5184 Fuse Terminal 125A
Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151?do not mount the fuse directly to the battery terminal. Interrupt rating satisfies ABYC requirements for DC Main circuit protection on large battery banks. Ignition protected?safe for installation aboard gasoline powered boats. Clear window?visual indication of blown condition. Color coded for each amperage
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£52.43
Blue Sea 6010 BS6010 Switch Battery m-Series Dual Circuit
m-Series Mini Dual Circuit Battery Switch - Red BS6010 Blue Sea 6010
Simultaneously switches two isolated battery banks
View all Blue Sea M-Series Battery Switches
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£15.55
Blue Sea 5178 Fuse Terminal 60A
Blue Sea 5178 Fuse Terminal 60A
Requires the use of Terminal Fuse Blocks PN 5191 or PN 2151?do not mount the fuse directly to the battery terminal. Interrupt rating satisfies ABYC requirements for DC Main circuit protection on large battery banks. Ignition protected?safe for installation aboard gasoline powered boats. Clear window?visual indication of blown condition. Color coded for each amperage
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£30.05
Blue Sea 2719 BS2719 Cover MaxiBus for 2127/2128
MaxiBus Insulating Cover for Blue Sea Busbars 2127 and 2128
Blue Sea 2719 BS2719
Insulating cover with breakouts for superior electrical insulation
Insulating cover meets ABYC insulations requirements
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£37.58
Blue Sea 5118 Fuse A3T/Class T 250A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£9.44
Blue Sea 5065 BS5065 Fuse Holder ATO/ATC Waterproof
Waterproof In-Line ATO/ATC Fuse holder BS5065 Blue Sea 5065
For use with ATO or ATC fuses
Supplied with 12 AWG pigtails
30A Maximum fuse amperage
Fuse sold separately
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£39.65
Blue Sea 5121 Fuse A3T/Class T 400A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£14.99
Blue Sea 2304 BS2304 MiniBus 5x 8-32 Stud Common Bus
Blue Sea 2304 Common 100A Mini BusBar - 5 Gang BS2304
Great for limited space applications
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£6.99
Blue Sea 5251 Fuse MIDI 40A
Fast-acting type fuses ideal for electronic devices. Standard circuit protection device for automobiles and trucks. Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Sold in packages of 2
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£92.27
Blue Sea 3000 BS3000 Switch Battery HD Series ON/OFF
HD-Series Heavy Duty On-Off Battery Switch BS3000 Blue Sea 3000
Switches a single battery to a single load group
Ignition protected—safe for installation aboard gasoline powered boats
Case design allows surface or rear panel mounting
Accepts two 4/0 AWG (95mm²) battery cables
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£35.99
Blue Sea 2151 Fuse Block TERMINAL 30-300A Dual
Compact, high-amp fuse?appropriate for DC Main, inverter, windlass, and bow thruster circuit protection. Provides high current protection in tight space constraints. Ignition protected when used with Blue Sea Systems' MRBF Terminal Fuse. Isolated stud design uses standard M8 hardware and permits stacking of terminals. Insulating cap prevents accidental shorts. Accepts 5?16" ring terminals. Mounts on 3/8? terminal studs. Fuse sold separately
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£37.58
Blue Sea 5117 Fuse A3T/Class T 225A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£3.84
Blue Sea 2404 BS2404 Terminal Block/Independent 4 Circuits 20A
Terminal Block 20A - 4 Circuit BS2404 Blue Sea 2404
Closed back design completely insulates power from the mounting surface
Each screw pair is one isolated circuit
Jumpers allow creation of common circuits
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£10.14
Blue Sea 5103 BS5103 Fuse MEGA 150A/32V
MEGA® / AMG® Fuse - 150 Amp BS5103 Blue Sea 5103
Most economical fuse for 100-300 Ampere circuit protection
For use with Blue Sea Systems' MEGA®/AMG® Fuse Block
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£37.58
Blue Sea 5114 Fuse A3T/Class T 150A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£37.58
Blue Sea 5116 Fuse A3T/Class T 200A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£58.14
Blue Sea 2126 BS2126 MaxiBus 6x5/16 Stud Common
Blue Sea Systems MaxiBus 250A BusBar - Six 5/16"-18 Studs BS2126 Blue Sea 2126
Busbars are used to consolidate multiple wires or feed multiple circuits
Insert molded stainless steel studs eliminate need for securing nut and allow high torquing for excellent electrical contact
Raised bus provides easy access to multiple wires on a single stud
UL 94-V0 rated base material resists high heat
Recessed mounting holes eliminate accidental shorts to aluminum and steel mounting surfaces
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£26.16
Blue Sea 5133 BS5133 Fuse ANL 300A
ANL Fuse - 300 Amp BS5133 Blue Sea 5133
Ignition protected (conforming to SAE J1171)- safe for installation aboard gasoline powered boats (35-500 Amp only)
Silver-plated connector blades for corrosion resistance
Visible indication of blown condition
6,000 Ampere Interrupt Capacity (AIC) satisfies ABYC requirements for main DC circuit protection on large battery banks
For use with Blue Sea Systems' ANL Fuse Blocks
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£47.99
Blue Sea 5046 BS5046 Fuse Block ST Blade Compact 8 Circuits with Cover
Blue Sea 5046 BS5046 Fuse Block ST Blade Compact 8 Circuits with Cover
Provides surface mount circuit protection for ATO?/ATC? Fuses in a compact footprint. Ignition protected when cover is secure ?meets ISO 8846 and SAE J1171 for use in a gasoline engine compartment Single side design allows wire entry from one side to minimize footprint Insulating cover meets ABYC/USCG insulation requirements Tin-plated copper buses and fuse clips Accepts ring or snap fork type terminals Includes 8 write-on circuit labels Fuses sold separately
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£166.00
Blue Sea 7649 BS7649 Solenoid Mini Add A Battery
Blue Sea 7649 BS7649 Solenoid Mini Add A Battery
The ADD-A-BATTERY is as simple to operate as an ON-OFF switch, yet effectively manages the switching and charging of two batteries from a single charge source
The Add-A-Battery includes a Dual Circuit Plus™ Battery Switch and an Automatic Charging Relay. These components simplify switching and automate charging so that all you have to do is turn the battery switch ON when you arrive and OFF when you leave.
Dual Circuit Plus™ Battery Switch
Simplifies switching
Isolates engine and house circuits
Combines batteries for emergency starting
Tin-plated copper studs for maximum conductivity and corrosion resistance
ACR Automatic Charging Relay
Automatically combines batteries during charging
Isolates batteries during engine cranking and when not charging
Shares the charge between two batteries more efficiently than a battery isolator
Allows efficient dual battery charging without needing regulator adjustment or rewiring
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£102.00
Blue Sea 2104 PowerBar 4x 3/8-16 Stud Terminal BS2104
PowerBar 4x 3/8-16 Stud Terminal Blue Sea 2104 BS2104
Made from ABS (strong nylon) and mounting plate wires / cables made of nickel-plated brass. terminals 4x 3/8 ?, dimensions 117 x 51 mm
Continuous Amperage: 600 Amp. Volt max: 48 V. DC 300 V. AC
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£3.54
Blue Sea 5299 BS5299 Fuse ATC easyID 40A
easyID Fuse 40 Amp BS5299 Blue Sea 5299
ATC® fuses illuminate when blown easyID™ illuminated ATC® blade fuses use Light Emitting Diode (LED) technology to show that a fuse has blown, making them easy to spot in fuse panels tucked up under dark dashboards.
Replaces non illuminating ATO® or ATC® fuses
Fast acting
Two per retail package
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£37.58
Blue Sea 5112 Fuse A3T/Class T 110A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£10.14
Blue Sea 5105 Fuse MEGA 200A/32V
Most economical fuse for 100-300 Ampere circuit protection. For use with Blue Sea Systems' MEGA?/AMG? Fuse Block
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£6.99
Blue Sea 5256 Fuse MIDI 100A
Fast-acting type fuses ideal for electronic devices. Standard circuit protection device for automobiles and trucks. Tin-plated connector blades for corrosion resistance. Visible indication of blown condition. Sold in packages of 2
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£37.58
Blue Sea 5113 Fuse A3T/Class T 125A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£37.58
Blue Sea 5115 Fuse A3T/Class T 175A
Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC)
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£7.18
Blue Sea 2506 Terminal Block/Independent 6 Circuits 30A
Closed back design completely insulates power from the mounting surface. Each screw pair is one isolated circuit. Jumpers allow creation of common circuits
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£4.75
Blue Sea 2406 BS2406 Terminal Block/Ind 6circ 20A
Blue Sea 2406 Terminal Block 20A - 6 Circuit BS2406
Closed back design completely insulates power from the mounting surface
Each screw pair is one isolated circuit
Jumpers allow creation of common circuits
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£12.89
Blue Sea 2510 BS2510 Terminal Block/Independent 10 Circuits 30A
Terminal Block 30A - 10 Circuit BS2510 Blue Sea 2510
Closed back design completely insulates power from the mounting surface
Each screw pair is one isolated circuit
Jumpers allow creation of common circuits
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£3.74
Blue Sea 4012 BS4012 Cable Cap 1x.500 Stud Red
CableCap - Red 0.50 Stud BS4012 Blue Sea 4012
Insulates single stud on alternators, starters, windlasses and high amperage termination points
Insulate stud type connectors on alternators, starters, windlasses and other high amperage devices
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£52.49
Blue Sea 1733 BS1733 Meter Mini OLED DC Voltage
Mini OLED DC Voltmeter - Yellow BS1733 Blue Sea 1733
Monitors DC voltage on a bright, waterproof, daylight readable OLED screen
Reverse polarity protected
Mounts in a common 1-1/8" (29mm) hole
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0 Kits Selected✕
Reliable Power Solutions from Blue Sea Systems
Blue Sea Systems is a trusted name in AC and DC electrical products, built to handle the toughest conditions in marine and specialized vehicle applications. From battery chargers to vessel system monitors, every product is engineered for long-term performance, ensuring reliable power wherever you go.
Industry-Leading Warranties for Peace of Mind
When you invest in Blue Sea Systems products, you’re backed by an unmatched warranty. P12 Battery Chargers and Remote Displays come with five years of coverage, while Digital Meters and Vessel System Monitors are covered for three years. If a product is found to be defective, Blue Sea Systems will replace or credit it—giving you confidence in every purchase.
Expertly Designed & Manufactured for Demanding Applications
Blue Sea Systems products are designed and manufactured in Bellingham, Washington, ensuring the highest quality standards. Their robust electrical components are built for marine environments, campervans, and motorhomes, making them the go-to choice for professionals and DIY installers alike. Whether you're upgrading a campervan or outfitting a boat, Blue Sea Systems delivers the durability and performance you need.
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FAQs
Learn more about our business & products below
Yes! If you're in the Gosport area, we provide expert installation to ensure your system is fitted safely and correctly.
Many Blue Sea Systems components are marine-grade and designed for water resistance, making them ideal for boats, campervans, and motorhomes. Always check the specifications for each product to confirm its rating.
Yes! Blue Sea Systems designs heavy-duty electrical components that can manage high power loads, making them perfect for off-grid living, professional vehicles, and marine applications.
Yes, Blue Sea Systems provides battery isolators, chargers, and monitoring systems to help you efficiently manage and extend the life of your battery setup.
Absolutely! Many of their components work well with solar power systems, helping distribute power safely and effectively in off-grid setups.