Blue Sea Systems offers a comprehensive range of high-quality marine electrical products. Their products include fuse panels, terminal fuses, distribution blocks, battery management systems, switches, circuit protection, and more. These products are designed to enhance the safety, reliability, and efficiency of electrical systems on boats and yachts. Blue Sea Systems' fuse panels and distribution blocks help organize and protect wiring, while their battery management solutions ensure proper power distribution and control. Their switches, voltmeters, and other components provide easy monitoring and control of onboard electrical systems. Overall, Blue Sea Systems' products contribute to the smooth operation and safety of marine electrical systems.
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1-2 weeks delivery time The Blue Sea 1733 is a compact Mini OLED DC voltmeter with a bright, daylight-readable display for accurate voltage monitoring in 12V and 24V systems. It mounts in a standard 1-1/8" hole, features reverse polarity protection, and delivers precise readings with 0.01V resolution in a waterproof, marine-ready design.
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$ 83.77
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1-2 weeks delivery time The Blue Sea Dual PowerPost 2018 is a dual-stud termination post with one 5/16"-18 stud and one 3/8"-16 stud, rated for 48 V DC, featuring a stud torque range of 120–140 in-lb (13.56 Nm). It mounts using #10 (M5) screws and is supplied with one red and one black insulator for polarity identification.
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$ 38.14
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1-2 weeks delivery time The Blue Sea 7650 Add-A-Battery Kit 120A is a dual-battery switching and charging kit rated at 120A for systems with two batteries and a single charge source. It includes an e-Series Dual Circuit Plus™ Battery Switch and an SI-ACR Automatic Charging Relay (12/24V DC, 120A). The system isolates engine and house circuits, provides emergency battery combine capability, and automatically manages charging without regulator adjustment or rewiring. Weight: 2.36 lb (1.07 kg). CE marked, ISO 8846 compliant.
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$ 301.71
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1-2 weeks delivery time The Blue Sea 1039 is a dual USB charger for 12V and 24V DC systems, delivering up to 4.8A total output with intelligent device recognition for fast, device-optimized charging. Designed to mount into an existing Contura switch aperture, it features internal filtering to reduce electronic interference, over-temperature protection, and a protective dust cap. The charger is potted for reliable operation in harsh marine environments and provides IP45 protection with the cover closed.
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$ 75.03
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1-2 weeks delivery time The Blue Sea 5035 ST Blade Fuse Block provides 6 independent ATO®/ATC® fused circuits for DC systems up to 32V DC, rated 30A per circuit and up to 40A per jumped circuit group. It features tin-plated copper fuse clips for corrosion resistance and improved efficiency, a clear insulating cover with label recesses for Small Format Labels, and a built-in spare fuse holder. The block mounts with #8 screws (M4) and accepts ring or snap fork terminals, with two terminal block jumpers included.
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$ 82.45
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1-2 weeks delivery time The Blue Sea 8378 DC Panel is an 18-position distribution panel for 12V DC systems with positive, negative, and grounding buses installed and fully pre-wired. It is rated to 100A maximum and features backlit circuit label positions and ON-indicating LEDs in all circuit positions. Panels with meters include a toggle switch for mounting up to three battery banks, and analog meter panels are owner-upgradable to 24V using meters 8240 or 8243 (18–32V DC). Dimensions are 7.50 × 14.75 × 2.50 in and weight is 7.80 lb (3.54 kg). Includes branch breakers plus analog voltmeter and ammeter with shunt.
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$ 1,582.61
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1-2 weeks delivery time The Blue Sea MaxiBus 2127 is a busbar rated for 250 A continuous current, featuring four 5/16"-18 stainless steel studs and supporting 300 V AC / 48 V DC. It uses a tin-plated copper bus (CDA 110 / UNS 11000), a UL 94-V0 glass-reinforced thermoplastic base, and has a recommended stud torque of 132 in-lb (14.91 N·m).
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$ 68.25
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1-2 weeks delivery time The Blue Sea 1001 CableClam 0.68" is a waterproof cable pass-through designed for antenna cable installations above the waterline. It allows co-axial cables to be routed without removing factory-installed connectors, supporting cable diameters up to 0.31" (7.87 mm) and connector diameters up to 0.68" (17.27 mm). The body is made from acetal with a UV-stabilized thermoplastic ring and a UV-stabilized Buna-N rubber seal for reliable weather protection.
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$ 34.86
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1-2 weeks delivery time The Blue Sea 1001100 CableClam is a waterproof cable pass-through for connectors up to 17.27 mm and cables up to 7.87 mm diameter, designed for above-waterline installations. Features a 316 stainless steel dress cap, UV-stabilized thermoplastic ring, Buna-N rubber seals (4.19 mm / 5.59 mm holes), and accepts #6 × 7/8″ mounting screws. Weight: 0.2 kg.
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$ 48.29
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1-2 weeks delivery time The Blue Sea 1002 CableClam 0.83" is a waterproof cable pass-through designed for antenna and co-axial cable installations above the waterline. It allows cables to be routed without removing factory-installed connectors, supporting cable diameters up to 0.44" (11.18 mm) and connector diameters up to 0.83" (21.08 mm). The acetal body, UV-stabilized thermoplastic ring, and UV-stabilized Buna-N rubber seal provide reliable environmental protection.
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$ 36.03
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1-2 weeks delivery time The Blue Sea 1002100 CableClam is a waterproof cable pass-through for connectors up to 21.08 mm and cables up to 11.18 mm diameter, designed for above-waterline installation. Includes a 316 stainless steel dress cap, UV-stabilized thermoplastic ring, Buna-N rubber seals (5.59 mm / 9.53 mm holes), and accepts #8 × 7/8″ mounting screws. Weight: 0.2 kg.
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$ 56.24
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1-2 weeks delivery time The Blue Sea 1003 CableClam 1.40" is a waterproof cable pass-through designed for antenna and co-axial cable installations above the waterline. It enables cable routing without removing factory-installed connectors and supports cable diameters up to 0.56" (14.22 mm) and connector diameters up to 1.40" (35.56 mm). The acetal body, UV-stabilized thermoplastic ring, and UV-stabilized Buna-N rubber seal provide durable weather resistance.
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$ 39.93
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1-2 weeks delivery time The Blue Sea 1003100 CableClam is a waterproof pass-through for cables up to 14.22 mm and connectors up to 35.56 mm, designed for above-waterline installation. Features a 316 stainless steel dress cap, UV-stabilized thermoplastic ring, Buna-N rubber seal, and accepts #8 × 7/8″ mounting screws. Weight: 0.2 kg.
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$ 59.83
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1-2 weeks delivery time The Blue Sea 1007 Side Entry CableClam is a waterproof side-entry cable pass-through designed for antenna cable installations above the waterline. Its one-piece side-mount design allows installation without removing factory-installed connectors and supports cable diameters up to 0.28" (7.11 mm) with connector diameters up to 1" (25.4 mm). The low-profile, contoured housing reduces the risk of line snagging and includes all required fasteners.
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$ 14.19
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1-2 weeks delivery time The Blue Sea 1007100 Side Entry CableClam is a water-resistant cable pass-through for cables up to 7.11 mm and connectors up to 25.4 mm, designed for above-waterline side mounting. Features a 316 stainless steel dress cap, UV-stabilized thermoplastic ring, Buna-N seal, and includes mounting fasteners. Weight: 0.2 kg.
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$ 29.72
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1-2 weeks delivery time The Blue Sea 1010 12V DC Plug is a moisture-proof power plug designed for wet environments and constant vibration. It features a sealing ring around the shaft, an “ON” LED indicator, internal strain relief, and a built-in 10 amp fuse. Nickel-plated copper alloy contacts and a twist-lock system ensure a secure fit and reliable electrical connection with compatible 12V DC sockets.
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$ 24.12
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1-2 weeks delivery time The Blue Sea 1011 is a 12V DC dash-mounted cigarette lighter socket designed for wet environments and constant vibration. It features a watertight protective cap, twist-lock compatibility with plugs, and large contact surfaces for reliable electrical connection. Rated up to 15A (with appropriate fuse and wiring), it supports panel, rear panel, or surface mounting and provides IP45 protection when the cover is closed.
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$ 20.43
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1-2 weeks delivery time The Blue Sea 1011200 is a white 12V DC dash socket rated up to 15A, designed for front panel, rear panel, or surface mounting with a 1-1/8" (28.58 mm) cutout. It features a watertight cap, twist-lock plug system, nickel-plated copper alloy current-carrying components, internal strain relief, and cord seal for reliable operation in wet and high-vibration environments. Weight: 0.10 lb (0.05 kg).
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$ 21.28
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1-2 weeks delivery time The Blue Sea 1012 is a 12V DC plug with a single extension socket designed for wet environments and constant vibration. The plug features a moisture-proof sealing ring, an “ON” LED indicator, internal strain relief, and a built-in 10 amp fuse, while the socket includes a watertight cap and twist-lock interlock with the plug. Supplied with heavy-duty 18 AWG wire, the cord extends up to 6 ft and supports secure power distribution from compatible 12V DC dash sockets.
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$ 52.57
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1-2 weeks delivery time The Blue Sea 1015 is a 12V DC plug and dash socket kit designed for wet environments and constant vibration. The plug features a moisture-proof sealing ring, an “ON” LED indicator, internal strain relief, and a built-in 10 amp fuse, while the dash socket includes a watertight cap and twist-lock compatibility. The kit supports front panel, rear panel, or surface mounting and provides a secure 12V DC power connection.
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$ 37.59
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What are the key components and features of a Blue Sea Systems add-a-battery dual circuit system, and how does it contribute to effective battery management on boats?
A Blue Sea Systems add-a-battery dual circuit system is a comprehensive solution designed for efficient battery management on boats and yachts. It includes key components such as an Automatic Charging Relay (ACR), distribution blocks, switches, fuses, and terminal blocks. The system allows seamless switching between battery banks, prioritizing charging and isolating them when necessary. This setup optimizes power distribution, prevents battery drain, and ensures reliable starting power. The dual circuit system is a fundamental tool in maintaining electrical integrity and uninterrupted power supply on marine vessels.
By integrating a Blue Sea Battery Switch, users gain a reliable and safe method to manually control power flow between battery banks. This switch is built to marine-grade standards, ensuring long-term durability in harsh environments.
How does a Blue Sea Systems SI-ACR (Automatic Charging Relay) function, and what benefits does it offer for maintaining optimal battery charging and isolation?
The Blue Sea Systems SI-ACR (Automatic Charging Relay) is a key component in advanced Marine Wiring systems, designed to simplify and optimize the management of multiple battery banks on boats and yachts. It functions by automatically connecting battery banks during charging—when voltage exceeds a preset threshold—and isolating them when charging stops or voltage drops.
For a complete power distribution and protection solution, pair the SI-ACR with a robust Blue Sea Fuse Block.
What is the purpose of a Blue Sea Systems MRBF (Terminal Fuse) and how is it utilized in marine electrical systems to ensure safety and protection?
The Blue Sea Systems MRBF (Terminal Fuse) is a crucial component in marine electrical systems designed to provide protection against overcurrent situations. It safeguards electrical circuits and equipment by interrupting the flow of current in the event of a fault or excessive current draw. These fuses are engineered to handle high current loads and are typically installed in close proximity to batteries, making them a critical element in systems that require high reliability and safety.
Often used alongside Blue Sea Add a Battery systems, MRBF fuses ensure consistent protection and help maintain the integrity of the overall electrical setup. Their compact design and high interrupt capacity make them ideal for marine environments, where space is limited and safety is paramount.
To further enhance electrical safety and efficiency, integrating a Blue Sea Terminal Block provides organized and secure connections, optimizing the performance and reliability of marine electrical installations.