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 1045 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. It mounts in a standard 1-1/8" panel cutout, features internal filtering to reduce electronic interference, and is fully potted for reliable operation in harsh marine environments. IP45 protection is provided when the protective dust cap is closed.
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$ 76.84
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1-2 weeks delivery time The Blue Sea 7052 Push Button Reset Only Circuit Breaker is a 5A thermal branch breaker for DC systems up to 32V, designed for panel mounting with 3/8-27 UNS thread and 1/4" male quick connect terminals. It features manual push-button reset, trip-free protection, and compact construction for high-density layouts. Interrupt capacity is 3000A @ 14.7V and 2500A @ 28V, operating temperature -10°C to +60°C, and the unit is ignition protected for gasoline engine compartments.
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$ 10.66
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1-2 weeks delivery time The Blue Sea 7703 ML Solenoid is a 24V DC bi-stable magnetic latching solenoid rated 500A continuous for engine, inverter, house loads, and emergency battery combine circuits. It provides switching under load without manual control, draws 0A in ON/OFF state, and only consumes current during switching. Features 3/8"-16 tin-plated copper studs with 22.23 mm length, supports 2x (4/0) cables, and is rated 500A continuous, 700A for 5 minutes, 1000A for 30 seconds. Operating range −10°C to +60°C. Weight 2.07 lb (0.94 kg). Includes SPDT Contura switch 2145. ABYC C-7, CE, IP66, ISO 8846, SAE J1171.
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$ 380.57
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1-2 weeks delivery time The Blue Sea 8127 AC Panel (European version) provides one double pole AC main breaker and 6 branch circuit positions for 230V AC systems. 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. The panel features a red reverse polarity LED. Panel dimensions are 7.50 × 5.25 in (190.5 × 133.35 mm). Weight is 1.87 lb (0.85 kg). Supplied with a 16A double pole main breaker, three 8A single pole branch breakers, AC label set, and 230V indicator LEDs.
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$ 463.62
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1-2 weeks delivery time The Blue Sea 7040 187-Series Circuit Breaker is a 60A panel-mount, Type III trip-free breaker that combines switching and circuit protection for DC systems up to 48V. It uses a thermally responsive bi-metal blade, features IP66 waterproof and ignition-protected construction, and is equipped with 5/16"-18 (M8) terminals 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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$ 152.60
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1-2 weeks delivery time The Blue Sea 1821 is a universal high-temperature sensor designed for monitoring raw water exhaust temperatures without drilling holes. It straps directly to the outside of the exhaust pipe, supports multiple mounting options, and is compatible with all Blue Sea Systems products that require a temperature sensor.
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$ 32.52
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Blue Sea 7225 – A-Series Red Toggle Circuit Breaker, Single Pole, 40A, Magnetic Hydraulic, Trip Free
1-2 weeks delivery time The Blue Sea 7225 A-Series circuit breaker is a single-pole, 40A magnetic hydraulic toggle breaker for AC and DC electrical panels. It combines switching and circuit protection in one device and features a trip-free design that cannot be held ON during a fault condition. Rated for 240V AC and 65V DC, with red toggle actuator, stainless steel mounting and terminal screws, 10,000 switching cycles, and operating temperature range from −40°C to +85°C. Meets ABYC standards and is certified CE, CSA, TUV, and UL 1077.
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$ 35.96
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1-2 weeks delivery time The Blue Sea 5191 MRBF Terminal Fuse Block is a compact high-amp fuse block designed for tight installations requiring DC main, inverter, windlass, and bow thruster circuit protection using MRBF fuses from 30A to 300A (fuse sold separately). It supports up to 300A and 58V DC, uses an isolated stud design with standard M8 (5/16") hardware to allow terminal stacking, includes an insulating cap to help prevent accidental shorts, accepts 5/16" ring terminals, and mounts on 3/8" terminal studs. Maximum torque is 75 in-lb (8.47 Nm) and weight is 0.16 lb (0.07 kg).
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$ 51.64
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1-2 weeks delivery time The Blue Sea 4302 WeatherDeck® Fuse Panel is a 12V DC waterproof fuse panel with 2 circuits for flybridge and open cockpit installations. The panel front is IP67 rated when properly mounted and supports immersion up to 1 meter for 30 minutes. It uses integrated ATO/ATC fuses with 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 total panel rating of 30A.
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$ 116.07
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1-2 weeks delivery time The Blue Sea Dual PowerPost 2016 is a dual-stud termination post featuring two 5/16"-18 stainless steel studs, rated for 48 V DC, with a recommended stud torque of 120 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 7622 ML-ACR is a 12V DC magnetic latching Automatic Charging Relay rated 500A continuous, 700A (5 min), and 1450A cranking, designed to automatically combine and isolate two battery banks during charge, discharge, and engine start. It features dual sensing, start isolation, engine isolation, start assist, and integrated manual control with LOCK OFF capability. Built with 3/8"-16 (M10) tinned copper studs (1.50" length), supports 4/0 AWG x2 cable, switching cycles 100,000, operating range −10°C to +60°C, and includes Remote Control Contura Switch PN 2146.
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$ 470.97
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1-2 weeks delivery time The Blue Sea 8359 AC Rotary Switch Panel is a 2-pole selector panel rated at 30A for 230V AC systems, designed to switch between two AC sources with an OFF position. It provides a compact transfer solution where circuit protection is installed elsewhere. The panel includes a 9009 heavy duty industrial rated rotary switch and AC rotary panel labels, features reverse polarity and power available LED indicators, and is built from heavy 1/8" aluminum 5052 alloy with a two-part polyurethane slate gray finish. Dimensions are 3.75 × 5.25 × 1.91 in and weight is 0.65 lb (0.29 kg).
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$ 451.16
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1-2 weeks delivery time The Blue Sea 5005 is an ANL fuse block for 12–32V DC systems, designed to accept ANL fuses rated from 35A to 300A (fuse sold separately). It features a swing-out design for fuse replacement without removing fasteners, 5/16" (M8) stainless steel studs, and an insulating cover that meets ABYC and USCG requirements with multi-directional wire access.
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$ 46.72
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1-2 weeks delivery time The Blue Sea 5119 Class T Fuse (300A) is built for extremely fast short-circuit response and high fault protection with a 20,000A interrupt capacity (AIC). It is rated 300A up to 125V DC, uses a 3/8" stud (Stud Size 190), and provides 20,000A @ 125V DC interrupt capacity. The fuse weighs 0.30 lb (0.14 kg) and works with the 5502 and 5502100 Class T Fuse Block with Insulating Cover (225 to 400A). It is UL listed to standard 248-15.
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$ 86.10
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1-2 weeks delivery time The Blue Sea 7044 187-Series Circuit Breaker is a 100A panel-mount, Type III trip-free breaker for DC systems up to 48V, combining manual 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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$ 152.60
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1-2 weeks delivery time The Blue Sea 7187 285-Series Circuit Breaker is a 100A surface-mount Type III breaker for DC systems up to 48V, combining manual switching and circuit protection in one device. It is a drop-in replacement for 185-Series breakers and uses a thermally responsive bi-metal blade with a visible reset lever to show trip status. The unit features trip-free operation, M6 terminal studs for 1/4" ring terminals, and is ignition protected and IP67 weather resistant. Operating range: -40°C to +85°C. Weight: 0.50 lb (0.23 kg).
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$ 94.93
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1-2 weeks delivery time The Blue Sea 9003e e-Series Battery Switch is a 350A continuous single-circuit ON-OFF switch for systems up to 48V DC. It supports 600A intermittent and 1200A starting loads, accepts 4/0 AWG cables, and uses 3/8"-16 (M10) studs. Cable clearance: 1.10" (27.94 mm). Weight: 0.95 lb (0.43 kg).
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$ 86.04
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1-2 weeks delivery time The Blue Sea 7061 Push Button Reset Only Circuit Breaker is a 40A thermal branch breaker for DC systems up to 32V, designed for panel mount 3/8-27 UNS with 1/4" male quick connect terminals. It features manual push-button reset, trip-free protection, and a compact body for high-density circuit layouts. Rated at 3000A @ 14.7V and 2500A @ 28V interrupt capacity, with operating range -10°C to +60°C, and ignition protected for gasoline engine compartments.
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$ 12.29
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1-2 weeks delivery time Blue Sea ML Series 12 V bistable remote solenoid with sealed construction and silver alloy contacts, consuming power only during switching and capable of handling up to 500 A continuous load with high surge capacity and explosion-proof design.
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$ 353.03
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1-2 weeks delivery time The Blue Sea 7701 ML Solenoid is a 12V DC magnetic latching solenoid rated for 500A continuous current, designed for engine, inverter, house loads, and emergency battery combine circuits. It draws no current in ON or OFF state and only consumes power when switching. The unit features silver alloy contacts, 3/8"-16 tin-plated copper studs with 7/8" (22 mm) length, and supports cable size up to 2x (4/0). Ratings include 500A continuous, 700A for 5 minutes, and 1000A starting (30 sec). Includes SPDT Remote Control Contura Switch 2145. Weight: 2.03 lb (0.92 kg). ABYC C-7, CE, IP66, ISO 8846, SAE J1171.
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$ 364.26
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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.