Blue Sea Systems Products: Precision and Reliability in Marine Electrical Components
Whether it's a surface-mounted power distribution panel or a common busbar, their products are designed with precision and reliability in mind. The A-series toggle switches, ANL and ATC fuses, ML-ACR and M-Series Mini relays, and specialty M2 OLED digital displays are just a few examples of their diverse product range catering to various marine needs.With features like ignition protection, high amperage capacity, and fast-charging capabilities, Blue Sea Systems ensures that their products meet the stringent requirements of specialty vehicle industries and marine applications. Their commitment to product quality and reliability makes them a trusted choice for power distribution panels and other electrical components in the boating industry.
Fast deliveries of yacht equipment, calculation, selection of analogues and spare parts. Send us your request and we will contact you ASAP with a solution. We deliver in Cyprus, throughout Europe and worldwide. More than 10 years of experience.
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1-2 weeks delivery time The Blue Sea 5001 is a MEGA® / AMG® fuse block for 32V DC systems, designed to accept 100–300A fuses (sold separately). It uses 5/16" (M8) stainless steel studs and includes an insulating cover that meets ABYC and USCG requirements, with multi-directional wire access and high-torque terminals for secure electrical connections. |
$ 42.12
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1-2 weeks delivery time The Blue Sea 5006100 MAXI Fuse Block is rated up to 80A and 32V DC and supports 14–4 AWG wiring with screw terminals torqued to 25 in-lb (2.82 Nm). It features a snap-on insulating cover, ignition protection, side or bottom wire entry breakouts, and terminal screws that compress fuse blades for low-resistance connections. Mounting uses #10 screws. Weight: 0.25 lb (0.11 kg). |
$ 49.84
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1-2 weeks delivery time The Blue Sea 5015 is a 6-circuit ST glass fuse block for 12–32V DC systems with an integrated negative bus and insulating cover. It supports AGC and MDL (3AG) glass fuses with a rating of 30A per circuit and 100A per block. The clear cover insulates all conductive parts to meet ABYC and USCG requirements and provides label recesses and spare fuse storage. |
$ 89.70
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1-2 weeks delivery time The Blue Sea 5021 is a water resistant panel-mount fuse holder designed for AGC and MDL fuses, rated up to 20A (depending on fuse and wire sizing). It is easy to open and built to withstand typical above-deck water exposure including salt spray, rain, hose washdowns, and momentary immersions. The holder installs in a 0.50in (12.7 mm) mounting hole and has a compact weight of 0.02 lb (0.01 kg), making it a practical replacement for fuse holders used in Contura Waterproof Fuse Panels. |
$ 7.63
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1-2 weeks delivery time The Blue Sea 5023 ST Blade Battery Terminal Mount Fuse Block is a 4-circuit ATO®/ATC® fuse block designed to mount directly on a battery terminal stud (clearance for 3/8" [M10]). Rated for up to 32V DC, it supports 100A per block and 30A per circuit (depending on fuse and wire sizing). It includes an insulating cover, four nylon insulated ring terminals, and one 15A ATO/ATC fuse (PN 5242). |
$ 44.39
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1-2 weeks delivery time The Blue Sea 5024 ST Blade Battery Terminal Mount Fuse Block Kit adds 4 fused ATO®/ATC® circuits directly at a battery terminal using a 3/8" (M10) stud mount. Rated up to 32V DC, it supports 100A per block and 30A per circuit (depending on fuse and wire sizing) and includes an insulating cover, 4-circuit negative busbar, write-on labels, and nylon insulated ring terminals (four 16–14 AWG and four 12–10 AWG). It is Ignition Protected and meets ISO 8846 and SAE J1171. |
$ 63.34
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1-2 weeks delivery time The Blue Sea 5025 ST Blade Fuse Block provides 6 ATO®/ATC® fused circuits with a built-in negative bus and insulating cover for organized branch circuit protection up to 32V DC. It supports 100A per block and 30A per circuit (depending on fuse and wire sizing) and uses #10-32 studs for both positive and negative distribution. The cover meets ABYC/USCG insulation requirements, includes an easy-open latch, storage for two spare fuses, and label recesses for Small Format Labels (with 20 write-on circuit labels included). |
$ 82.68
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1-2 weeks delivery time The Blue Sea 5028 ST Blade Fuse Block provides 6 ATO®/ATC® fused circuits with an insulating ABYC/USCG-compliant cover for clean branch circuit protection up to 32V DC. It supports 100A per block and 30A per circuit (depending on fuse and wire sizing) and uses a #10-32 positive bus stud with #8 screw (M4) mounting. The cover includes a push-button latch, storage for two spare fuses, and label recesses for Small Format Labels, with 20 write-on circuit labels included. |
$ 72.47
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Blue Sea 5029 - ST Blade Fuse Block, 12 Circuits with Cover, 32V DC, 100A per Block, 30A per Circuit
1-2 weeks delivery time The Blue Sea 5029 ST Blade Fuse Block provides 12 ATO®/ATC® fused circuits with an insulating ABYC/USCG-compliant cover for organized DC branch circuit protection up to 32V DC. It supports 100A per block and 30A per circuit (depending on fuse and wire sizing) and uses a #10-32 positive bus stud with #8 screw (M4) mounting. The cover features a push-button latch, storage for two spare fuses, and label recesses for Small Format Labels, with 20 write-on circuit labels included. |
$ 93.14
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1-2 weeks delivery time The Blue Sea 5032 ST Blade Split Bus Fuse Block provides 12 ATO®/ATC® fuse circuits in two isolated 6-circuit groups, designed for systems needing a mix of switched and 24-hour circuits or two isolated batteries. Rated up to 32V DC, it supports 30A per circuit with 100A total (not to exceed 80A per load group). It includes a negative bus with #10-32 stud, a clear ABYC/USCG-compliant insulating cover with fuse storage and label recesses, and #8-32 screw terminals (fuses sold separately). |
$ 150.39
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1-2 weeks delivery time The Blue Sea 5037 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, reduced heat, and improved electrical efficiency, and mounts with #8 screws (M4). The block accepts ring or snap fork terminals and includes two terminal block jumpers (fuses sold separately). |
$ 66.59
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1-2 weeks delivery time The Blue Sea 5045 ST Blade Compact Fuse Block provides 4 ATO®/ATC® fused circuits in a compact surface-mount design with single-side wire entry to minimize footprint. Rated up to 32V DC, it supports 100A per block and 30A per circuit (depending on fuse and wire sizing), includes an ABYC/USCG-compliant insulating cover, and is Ignition Protected when the cover is secured (ISO 8846 / SAE J1171). Built with tin-plated copper buses and fuse clips, it accepts ring or snap fork terminals and includes 4 write-on circuit labels (fuses sold separately). |
$ 60.21
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1-2 weeks delivery time The Blue Sea 5046 ST Blade Compact Fuse Block provides 8 ATO®/ATC® fused circuits in a compact surface-mount design with single-side wire entry to reduce installation footprint. Rated up to 32V DC, it supports 100A per block and 30A per circuit (depending on fuse and wire sizing), includes an ABYC/USCG-compliant insulating cover, and is Ignition Protected when the cover is secured (ISO 8846 / SAE J1171). It uses tin-plated copper buses and fuse clips, accepts ring or snap fork terminals, and includes 8 write-on circuit labels (fuses sold separately). |
$ 96.02
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1-2 weeks delivery time The Blue Sea 5052 ST CLB Circuit Breaker Block provides 6 resettable CLB circuit breaker positions with integrated positive and negative bus using #10-32 studs, rated up to 32V DC. It supports 100A per block and 32A per circuit (depending on wire sizing) and uses snap-in quick connect clips for easy breaker installation. The block mounts using #8 screw (M4) or #8 nut, has 5.63in (143 mm) mounting centers, a height of 6.69in (169.93 mm), and operates from -10°C to 60°C. |
$ 105.61
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1-2 weeks delivery time The Blue Sea 5056 ST-Blade Water-Resistant Fuse Block provides compact water-resistant circuit protection for ATO/ATC fuses and ATO/ATC-style low profile circuit breakers, rated up to 32V DC with 80A per block and 25A per circuit. It uses tin-plated copper C11000 bus material, supports (1) 8–4 AWG input and (4) 16–10 AWG load wiring, and mounts with clearance for 1/4" (6 mm) screws. The cover includes spare fuse/fastener storage and comes with four write-on circuit labels and 3 wire plugs to maintain the water-resistant rating when fewer than 4 loads are used (fuses and breakers sold separately). |
$ 68.10
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1-2 weeks delivery time The Blue Sea 5060 Crimpable In-Line AGC/MDL Fuse Holder is designed for 12–18 AWG wire and supports a maximum 30A fuse (fuse sold separately). It provides a compact inline fuse holder solution for AGC or MDL fuses and weighs 0.03 lb (0.01 kg). |
$ 5.42
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1-2 weeks delivery time The Blue Sea 5061 Waterproof In-Line AGC/MDL Fuse Holder is designed for 12–16 AWG wire and supports a maximum 30A fuse (fuse sold separately). This inline fuse holder accepts AGC and MDL fuses and is listed with a weight of 0.1 lb (0.05 kg) and 0.03 lb (0.01 kg). |
$ 10.68
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1-2 weeks delivery time The Blue Sea 5064 In-Line ATO/ATC Fuse Holder is designed for use with ATO or ATC blade fuses and is supplied with 12 AWG pigtails for straightforward installation. It supports a maximum 30A fuse amperage (fuse sold separately) and has a weight of 0.03 lb (0.01 kg). |
$ 6.84
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What are the primary components of marine electrical systems, and how do they contribute to the functionality of a boat?
Marine electrical systems consist of several key components that are essential for the functionality of a boat. These components include fuse blocks, circuit breaker panels, toggle switches, terminal blocks, and busbars, among others. Fuse blocks and heavy duty circuit breaker panels provide crucial circuit protection, ensuring that electrical circuits are safeguarded against overloads and short circuits. Toggle switches and terminal blocks facilitate the operation and connection of various electrical devices and systems onboard, while busbars enable efficient power distribution throughout the vessel. Innovative electrical systems, such as those offered by Blue Sea Systems, are engineered to withstand marine conditions, providing water resistance and durability. These components collectively contribute to reliable power distribution, efficient circuit protection, and overall electrical system performance, ensuring the safety and functionality of the boat.
In addition to these essential components, marine electrical systems may also include specialized equipment like switch panels and battery chargers. A 12-circuit switch panel allows for convenient control over multiple electrical circuits, while heavy-duty battery chargers ensure efficient charging of onboard batteries. Remote battery switches provide convenient control over battery banks, enhancing operational flexibility. Surface-mounted powerbars serve as centralized distribution points for electrical connections, simplifying wiring and maintenance tasks. As a trusted supplier in the marine industry, Blue Sea Systems offers fast-charging solutions and ignition-protected components like the SI-ACR, ensuring safe and reliable operation. Single-pole components like the L-series, AMG, and MIDI fuses provide essential circuit protection, while wire gauges (AWG) are carefully selected to meet the reliability standards of boating applications For centralized safety and protection, consider integrating a Blue Sea Fuse Block into your setup.
Whether you're upgrading an existing setup or outfitting a new vessel, the inclusion of a Blue Sea Battery Switch ensures dependable power control and long-lasting performance in demanding marine environments.
How do fuse blocks, battery switches and circuit breaker panels enhance the safety and reliability of marine electrical systems?
Fuse blocks, battery switches, and circuit breaker panels significantly enhance the safety and reliability of marine electrical systems by offering structured, protected, and efficient power distribution. Built to endure harsh marine conditions, components from Blue Sea Systems Electrical—such as water-resistant fuse blocks and ignition-protected battery switches—ensure dependable performance over time.
Circuit protection devices like the ST blade fuse and 285-series circuit breaker safeguard against electrical overloads and short circuits, reducing the risk of onboard fires or equipment failure. Products like the 5026 and 6006 circuit breakers are engineered to withstand high loads and corrosive marine environments, while surface-mount fuse blocks and powerbars provide neat, space-saving solutions for circuit management.
These components are often key parts of the Blue Sea Add a Battery system, enabling optimized battery usage and protection. High-amperage ratings (e.g., 150 amps) and advanced features like the 7610 relay and 2104 switch—both ignition-protected—further elevate the safety standards of your vessel's electrical setup, offering peace of mind and operational reliability in any marine scenario.
What are the advantages of using specialty components like solenoid switches, busbar, terminal blocks, chargers and inverter systems in marine applications?
Specialty components like solenoid switches, busbars, terminal blocks, chargers, and inverter systems offer numerous advantages in marine applications, particularly when integrated into a well-designed Marine Wiring system. Solenoid switches enable reliable remote control of high-current circuits, making it easier to manage systems like lighting, pumps, and winches with minimal energy loss.
Heavy-duty solenoid switches are designed to withstand the rigorous demands of marine environments, offering robust performance and longevity. Surface-mount powerbars provide a convenient and organized solution for connecting multiple electrical devices, ensuring efficient power distribution throughout the vessel. With capabilities for fast charge and ignition-protected features, these components deliver reliable power management and safety, enhancing the overall functionality and performance of marine electrical systems.
For additional reliability and organization in your vessel's electrical setup, consider integrating a Blue Sea Terminal Block, ensuring secure and efficient connections in challenging marine environments.