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 7050 Push Button Reset Only Circuit Breaker is a 3A panel-mount thermal breaker for DC systems up to 32V, designed for branch and 24-hour circuit protection. It features manual push-button reset, trip-free operation, and 1/4" male quick connect terminals, with 3/8-27 UNS panel mounting. Interrupt capacity is 3000A @ 14.7V and 2500A @ 28V, operating temperature -10°C to +60°C, and the unit is ignition protected.
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$ 10.89
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1-2 weeks delivery time The Blue Sea 7713 ML-RBS is a 12V DC auto-releasing magnetic latching remote battery switch rated 500A continuous for high-current circuits. Supports remote and manual control with LOCKED OFF override, SPST/SPDT control, and LED state output. Ratings: 500A continuous, 700A 5 min, 1000A 30 sec. Control voltage 10.1–16.5V DC. Studs 3/8"-16, length 22.23 mm, cable size up to 2×(4/0). Operating −10°C to +60°C. Weight 2.07 lb (0.94 kg). ABYC C-7, CE, IP66, ISO 8846, SAE J1171.
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$ 447.57
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1-2 weeks delivery time The Blue Sea 7900 is a red spare key for M-Series battery switches, designed as a replacement key for keyed M-Series switch models. Weight 0.10 lb (0.05 kg). Compatible with model 6005 m-Series Mini On-Off Battery Switch with Key.
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$ 6.10
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1-2 weeks delivery time The Blue Sea 5108 MEGA® / AMG® Fuse (300A) is an economical solution for 100–300A circuit protection applications and is designed for use with Blue Sea Systems AMG® fuse blocks. It is rated 300A, 70V DC, and is Ignition Protected (Yes), with an interrupt capacity of 2000A @ 32V DC. The fuse weighs 0.06 lb (0.03 kg) and works with all AMG fuse blocks, including the 7721 AMG® Safety Fuse Block.
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$ 18.49
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1-2 weeks delivery time The Blue Sea 7049 187-Series Circuit Breaker is a 200A panel-mount, Type III trip-free breaker for DC systems up to 48V, combining switching and circuit protection in a single device. It uses a thermally responsive bi-metal blade, features IP66 waterproof and ignition-protected construction, and includes 5/16"-18 (M8) terminal studs with 75 in-lb (8.47 Nm) torque. Interrupt capacity is 5000A @ 14VDC, 3000A @ 28VDC, and 1500A @ 48VDC, with an operating temperature range of -40°C to +85°C.
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$ 228.98
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1-2 weeks delivery time The Blue Sea 5510e e-Series Dual Circuit Battery Switch simultaneously switches two isolated battery banks and is rated 350A continuous, 525A intermittent (5 min), and 700A cranking per circuit (30 sec) for systems up to 32V DC. It features 3/8"-16 (M10) tinned copper studs with 140 in-lb torque rating, supports 4/0 AWG cables, and provides ignition protection with IP66 rating. Weight: 1.16 lb (0.53 kg).
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$ 123.94
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1-2 weeks delivery time The Blue Sea 8143 is a European AC breaker panel with one double pole main breaker and 3 branch positions for 230V AC systems, supplied with an integrated AC micro voltmeter (0–250V). It is fully pre-wired with hot, neutral, and safety ground buses and includes backlit circuit label positions and ON indicator LEDs in all circuits, plus a red reverse polarity LED. Panel dimensions are 7.50 × 5.25 in (190.5 × 133.35 mm). Weight is 2.00 lb (0.91 kg).
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$ 449.52
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1-2 weeks delivery time The Blue Sea 7700 ML-RBS Remote Battery Switch is a 12V DC magnetic latching switch rated for 500A continuous current, designed for high-amperage battery switching under load from remote or manual control. It features a manual override knob with LOCKED OFF service position, bi-stable coil, silver alloy contacts, and 3/8"-16 tin-plated copper studs with 7/8" (22 mm) length for multiple cable terminals. Ratings include 500A continuous, 700A for 5 minutes, and 1000A cranking (30 sec). Operating range −10°C to +60°C. Mechanical endurance: 100,000 cycles. Weight: 2.05 lb (0.93 kg). CE marked, IP66, ignition protected, ISO 8846, SAE J1171.
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$ 386.72
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1-2 weeks delivery time The Blue Sea 1810 is a non-contact ultrasonic tank sender for diesel, water, and waste tanks up to 32 inches deep. Designed for use with the Blue Sea VSM 422 and M2 monitors, it features digital filtering to reduce slosh errors and precise calibration per tank, delivering reliable level measurement without mechanical moving parts.
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$ 235.09
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1-2 weeks delivery time The Blue Sea 11003 is a heavy-duty HD-Series 3-position battery selector switch rated 400A continuous and 32V DC for switching isolated battery banks to all loads. Includes Alternator Field Disconnect (AFD), accepts two 4/0 AWG cables per terminal, and features 1/2″ (M12) studs. Cable clearance: 27.94 mm. Weight: 0.57–0.59 kg.
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$ 200.62
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1-2 weeks delivery time The Blue Sea 2155 is an SPDT remote control Contura switch with momentary ON-ON action, featuring a red actuator, engineered to resist vibration, shock, thermoshock, moisture, and salt spray, with a weight of 0.30 lb (0.14 kg).
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$ 45.29
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1-2 weeks delivery time The Blue Sea 8505 is a 230V AC (European) distribution panel with AC main breaker, 3 branch circuit positions, and an AC digital multi-function meter with alarm. It is fully pre-wired with hot, neutral, and safety ground buses, and includes reverse polarity indication, backlit labels, and ON-status LEDs in all positions. Dimensions: 7.50 × 5.25 in. Weight: 2.94 lb.
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$ 963.26
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1-2 weeks delivery time The Blue Sea 2145 is an SPDT remote control Contura switch with momentary (ON)-OFF-(ON) action, featuring a red actuator, designed for operation in environments resistant to vibration, shock, thermoshock, moisture, and salt spray, with a weight of 0.09 lb (0.04 kg).
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$ 44.30
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1-2 weeks delivery time The Blue Sea 4306 WeatherDeck® Fuse Panel is a 12V DC waterproof fuse panel with 6 circuits for flybridge and open cockpit installations. The panel front is IP67 rated when properly mounted and is protected against immersion up to 1 meter for 30 minutes. It features integrated ATO/ATC fuse-based circuit protection, bicolored LED circuit status indication, and an independent label backlighting circuit for remote switching and dimming. Electrical rating is 15A per circuit at 12V DC, with a cumulative panel rating of 90A.
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$ 228.54
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1-2 weeks delivery time The Blue Sea 5026 ST Blade Fuse Block provides 12 ATO®/ATC® fused circuits with an integrated negative bus and insulating 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 #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).
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$ 103.35
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1-2 weeks delivery time The Blue Sea 4160 is a 10A push button LED ring switch with OFF-ON operation for 12V DC systems. It supports SPST or SPDT wiring, normally open or normally closed configurations, independent LED power contacts, and IP67-rated sealing for marine applications.
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$ 38.25
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1-2 weeks delivery time The Blue Sea 4352 is a 6-position BelowDeck circuit breaker panel for 12V DC systems. It uses six illuminated 15A circuit breakers with red ON indication and integrated overcurrent protection, with a cumulative panel rating of 45A. The low-profile panel features quick-connect bus architecture for simplified wiring in protected installations.
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$ 84.01
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1-2 weeks delivery time The Blue Sea 5113 A3T / Class T Fuse (125A) is a fast-acting fuse with extremely fast short-circuit response and a 20,000A interrupt capacity (AIC). It is rated 125A up to 125V DC, with an interrupt capacity of 20,000A @ 125V DC, a stud torque specification of 3/8" in-lb (0.34 Nm), and a weight of 0.30 lb (0.14 kg). This fuse works with the 5007100 Class T Fuse Block with Insulating Cover (110 to 200A).
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$ 69.94
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1-2 weeks delivery time The Blue Sea 5007100 Class T Fuse Block supports Class T fuses rated 110–200A with maximum system voltage 160V DC and cable capacity up to 4/0 AWG. It features tin-plated copper fuse blocks, stainless steel 1/4"-20 (M6) studs, 72 in-lb (8.13 Nm) torque rating, insulating cover with multi-direction breakouts, UL94-V0 heat-resistant base, and ignition protection. Mounting uses 1/4" or M6 hardware. Weight: 1.10 lb (0.5 kg).
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$ 82.14
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1-2 weeks delivery time The Blue Sea 7748 SafetyHub 150 Fuse Block is an ignition-protected 10-circuit fuse block with screw termination and integrated negative bus, designed for gasoline and diesel boats. It accepts 4 AMI®/MIDI® fuses up to 200A and 6 ATO®/ATC® fuses up to 30A. Operating voltage 12/24/32V. Combined current up to 600A with 2×4/0 cable (50°C ambient). M8 studs, IP66 sealed cover. Weight 3.50 lb (1.59 kg).
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$ 232.13
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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.