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 5257 AMI / MIDI Fuse 125A is a fast-acting 32V DC fuse designed for dependable circuit protection in electronic devices as well as automotive and truck electrical systems. It features tin-plated copper connector blades for corrosion resistance and a visible indication of a blown condition for quick inspection during servicing. With an interrupt capacity of 5000A @ 16V DC and 2000A @ 32V DC, it supports high fault-current protection and operates in temperatures from -40°C to 125°C. Supplied in a pack of 2.
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$ 11.93
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1-2 weeks delivery time The Blue Sea 5258 AMI / MIDI Fuse 150A is a fast-acting 32V DC fuse designed for reliable circuit protection in electronic devices as well as standard automotive and truck electrical systems. It features tin-plated copper connector blades for corrosion resistance and a visible indication of a blown condition for fast visual inspection during servicing. With an interrupt capacity of 5000A @ 16V DC and 2000A @ 32V DC, it provides high fault-current protection and supports operation in temperatures from -40°C to 125°C. Supplied in a pack of 2.
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$ 12.79
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1-2 weeks delivery time The Blue Sea 5259 AMI / MIDI Fuse 175A is a fast-acting 32V DC fuse designed for reliable circuit protection in electronic devices as well as automotive and truck electrical systems. It features tin-plated copper connector blades for corrosion resistance and a visible indication of a blown condition for quick inspection during servicing. With an interrupt capacity of 5000A @ 16V DC and 2000A @ 32V DC, it supports high fault-current protection and operates across a temperature range of -40°C to 125°C. Supplied in a pack of 2.
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$ 12.79
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1-2 weeks delivery time The Blue Sea 5260 AMI / MIDI Fuse 200A is a fast-acting 32V DC fuse designed for dependable circuit protection in electronic devices as well as automotive and truck electrical systems. It features tin-plated copper connector blades for enhanced corrosion resistance and a visible indication of a blown condition for fast inspection during servicing. With an interrupt capacity of 5000A @ 16V DC and 2000A @ 32V DC, it supports high fault-current protection and operates across a temperature range of -40°C to 125°C. Supplied in a pack of 2.
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$ 12.79
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1-2 weeks delivery time The Blue Sea 5275 AGA Fuse 20A is a compact 32V DC fuse designed for 12/24V DC circuit protection commonly used with electronic equipment. It features a visible indication of a blown condition for quick inspection and servicing. Rated at 20A, this fuse is supplied five per retail package and weighs 0.03 lb (0.01 kg).
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$ 5.47
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1-2 weeks delivery time The Blue Sea 5282 GMA Fuse 3A is a compact fuse designed for circuit protection in electronic applications, commonly used in 12/24V DC systems. Rated at 3A, it supports a maximum voltage of 250V AC / 24V DC and features a visible indication of a blown condition for quick inspection and replacement. Supplied three per retail package, it weighs 0.03 lb (0.01 kg) and is suitable for space-efficient installations.
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$ 3.77
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1-2 weeks delivery time The Blue Sea 5283 GMA Fuse 5A is a compact fuse designed for circuit protection in electronic applications commonly used in 12/24V DC systems. Rated at 5A, it supports a maximum voltage of 125V AC / 24V DC and features a visible indication of a blown condition for fast inspection and replacement. Supplied three per retail package, it weighs 0.03 lb (0.01 kg) and is suitable for space-efficient fuse installations.
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$ 3.77
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1-2 weeks delivery time The Blue Sea 5284 GMA Fuse 7A is a compact fuse designed for circuit protection in electronic applications commonly used in 12/24V DC systems. Rated at 7A, it supports a maximum voltage of 125V AC / 24V DC and includes a visible indication of a blown condition for quick inspection and replacement. Supplied three per retail package, it weighs 0.03 lb (0.01 kg) and is suitable for space-efficient installations.
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$ 3.77
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1-2 weeks delivery time The Blue Sea 5285 GMA Fuse 10A is a compact fuse designed for circuit protection in electronic applications commonly used in 12/24V DC systems. Rated at 10A, it supports a maximum voltage of 125V AC / 24V DC and features a visible indication of a blown condition for fast inspection and replacement. Supplied three per retail package, it weighs 0.03 lb (0.01 kg) and is suitable for space-efficient installations.
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$ 3.77
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1-2 weeks delivery time The Blue Sea 5290 easyID Fuse Kit is a fast-acting ATC blade fuse assortment designed to make blown fuses easy to identify using LED illumination technology. Each easyID ATC fuse illuminates when blown, providing a clear visual indicator in fuse panels installed in low-light areas such as dashboards. This kit replaces standard ATO or ATC non-illuminating fuses and includes 27 fuses total (3 pieces each) in ratings 3A, 5A, 7.5A, 10A, 15A, 20A, 25A, 30A, and 40A. Total kit weight is 0.09 lb (0.04 kg).
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$ 49.81
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1-2 weeks delivery time The Blue Sea 5292 easyID ATC Fuse 5A is a fast-acting illuminated blade fuse designed to simplify blown fuse identification using LED technology. The fuse illuminates when blown, making it easy to spot in fuse panels installed in low-light locations such as under dashboards. Rated at 5A with an interrupt capacity of 1000A @ 32V DC, it features tin-plated blades for reliable electrical connection and is supplied two per retail package, replacing standard non-illuminating ATO or ATC fuses.
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$ 8.68
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1-2 weeks delivery time The Blue Sea 5502 Class T Fuse Block with Insulating Cover is a heavy-duty fuse holder designed for high-speed short-circuit response, recommended by many inverter manufacturers. It supports Class T fuses from 225A to 400A (fuse sold separately) and is rated for systems up to 160V DC with a maximum amperage of 400A. The block uses large tin-plated copper mounting blocks for heat dissipation, features 3/8"-16 (M10) stud terminals for ring terminals and cable up to 4/0 AWG, and includes a clear insulating cover that satisfies ABYC/USCG requirements. Maximum torque is 190 in-lb (21.47 Nm), mounting holes accept 1/4" (M6) screws, and unit weight is 1.10 lb (0.5 kg).
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$ 108.19
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1-2 weeks delivery time The Blue Sea 5502100 Class T Fuse Block supports 225–400A Class T fuses with maximum system voltage 160V DC and cable capacity up to 4/0 AWG. It features tin-plated copper fuse blocks, stainless steel 5/16"-18 (M8) studs, insulating cover with multi-direction breakouts, and UL94-V0 heat-resistant base. Maximum recommended current is 320A (300A continuous inside engine space), with best practice to limit circuit load to 80% of fuse rating. Weight: 1.10 lb (0.5 kg).
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$ 149.76
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1-2 weeks delivery time The Blue Sea 5503 ANL Fuse Block with Insulating Cover is a heavy-duty 32V DC fuse holder for ANL fuses (35–750A), featuring a swing-out design for quick fuse replacement and an ABYC/USCG-compliant insulating cover. It uses stainless steel 5/16" (M8) studs, accepts 4/0 AWG cable with tin-plated copper mounting blocks, and provides reliable high-current connections with a maximum torque of 107 in-lb (12.09 Nm).
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$ 94.93
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1-2 weeks delivery time Blue Sea dual circuit battery switch for controlling two isolated battery banks at the same time, built from reinforced polycarbonate with silver-plated copper terminals and rated up to 350 A continuous, suitable for surface or flush mounting in marine electrical systems.
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$ 112.21
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Blue Sea 5511e – e-Series Dual Circuit Plus™ Battery Switch, 350A Continuous, 32V DC, M10 Studs, Red
1-2 weeks delivery time The Blue Sea 5511e e-Series Dual Circuit Plus™ Battery Switch simultaneously switches two isolated battery banks or combines them to all loads and features a make-before-break design. Rated 350A continuous, 525A intermittent (5 min), and 700A cranking per circuit (30 sec) for systems up to 32V DC, it uses 3/8"-16 (M10) tinned copper studs with 140 in-lb torque and supports cables up to 4/0 AWG. Weight: 1.16 lb (0.53 kg).
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$ 117.47
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1-2 weeks delivery time Blue Sea Dual Circuit Plus battery switch allowing independent or combined control of two battery banks, enabling parallel connection in the BOTH position, with silver-plated copper contacts and high current handling up to 350 A continuous for flexible onboard power management.
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$ 108.71
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1-2 weeks delivery time The Blue Sea 6004 m-Series Battery Switch is a single-circuit ON/OFF switch with a locking key, rated for 48V DC and 300A continuous (500A intermittent / 900A starting). It features tinned copper 3/8" (M10) studs with 7/8" (22 mm) stud length for multiple ring terminals, IP66 ignition-protected construction, and an isolating rear cover with breakout tabs for cable routing in any direction.
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$ 59.67
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1-2 weeks delivery time The Blue Sea 6004200 is a single circuit ON-OFF battery switch rated 300A continuous, 500A intermittent, and 900A cranking (30 sec) for systems up to 48V DC. It features 3/8" (M10) tinned copper studs with 120 in-lb torque rating, 7/8" (22 mm) stud length for multiple terminals, IP66 protection, ignition protection, and a locking key mechanism. Weight: 0.65 lb (0.29 kg).
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$ 59.67
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1-2 weeks delivery time The Blue Sea 6005 m-Series Mini ON/OFF Battery Switch is a single-circuit battery isolator with a locking key, rated for 48V DC and 300A continuous (500A intermittent / 900A starting). It supports 4/0 AWG (120mm²) cable with 3/8"-16 (M10) tinned copper studs, provides 1.12 in (28.45 mm) cable clearance for 4/0 wiring, and allows surface, front panel, or rear panel mounting. The switch is ignition protected and IP66, and includes an isolating rear cover to protect contacts.
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$ 57.49
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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.