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.
|
1-2 weeks delivery time The Blue Sea 7504 DeckHand Dimmer is a 24V DC digital lighting dimmer rated at 6A, designed for non-regulated LED, incandescent, and halogen lights. It provides continuous output control from 0–100% of input voltage, includes memory for the last setting, and supports an illuminated exit with adjustable time delay. The unit features offset mounting tabs for close installation spacing and is supplied with a momentary (ON)-OFF-(ON) control switch (PN 8216). Operating temperature range is −40°C to +85°C, with 2 mA maximum parasitic current and IP67 / ignition protected ratings.
|
$ 161.62
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7506 DeckHand Dimmer is a 12V DC digital lighting dimmer rated at 6A, designed for non-regulated LED, incandescent, and halogen lights. It provides continuous output control from 0–100% of input voltage, includes last-setting memory, and supports an illuminated exit with adjustable time delay. The unit features offset mounting tabs for close installation spacing and is supplied with a momentary (ON)-OFF-(ON) control switch (PN 8216). Operating range is −40°C to +85°C with 2 mA maximum parasitic current and ignition protected IP67 rating.
|
$ 143.75
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7507 DeckHand Dimmer is a 12V DC digital lighting dimmer rated at 12A for non-regulated LED, incandescent, and halogen lights. It provides continuous output control from 0–100% of input voltage, includes last-setting memory, and supports an illuminated exit with adjustable time delay. The unit features offset mounting tabs for close installation and is supplied with a momentary (ON)-OFF-(ON) control switch (PN 8216). Operating temperature range is −40°C to +85°C with 2 mA maximum parasitic current and ignition protected IP67 rating.
|
$ 161.62
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7508 DeckHand Dimmer is a 12V DC digital lighting dimmer rated at 25A for non-regulated LED, incandescent, and halogen lights. It provides continuous output control from 0–100% of input voltage, includes last-setting memory, and supports an illuminated exit with adjustable time delay. The unit features offset mounting tabs for close installation and is supplied with a momentary (ON)-OFF-(ON) control switch (PN 8216). Operating range is −40°C to +85°C with 2 mA maximum parasitic current and ignition protected IP67 rating.
|
$ 187.85
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7509 DeckHand Dimmer is a 24V DC digital lighting dimmer rated at 12A for non-regulated LED, incandescent, and halogen lights. It provides continuous output control from 0–100% of input voltage, stores the last brightness setting, and supports an illuminated exit with adjustable time delay. The unit includes offset mounting tabs for close installation and is supplied with a momentary (ON)-OFF-(ON) control switch (PN 8216). Operating temperature range is −40°C to +85°C with 2 mA maximum parasitic current and ignition protected IP67 rating.
|
$ 184.08
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7531 P12 Battery Charger is a 12V DC charger rated at 25A total output with three positive outputs and one negative, designed for dry mount installation in harsh environments. It features four-stage charging with PreFloat™, power factor corrected AC input (115–230V AC, 45–65Hz), battery temperature compensation, and Charge Coordination with Blue Sea ACRs. The unit supports AGM, flooded, gel, and TPPL batteries, includes a large multi-language display, M6 studs, ignition protection, and operates from −20°C to +70°C. Dimensions are 13.03 × 8.46 × 3.66 in, weight 12.00 lb.
|
$ 1,188.74
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7532 P12 Battery Charger is a 12V DC charger rated at 40A total output with three positive outputs and one negative, designed for dry mount installation in harsh environments. It features four-stage charging with PreFloat™, power factor corrected AC input (115–230V AC, 45–65Hz), battery temperature compensation, and Charge Coordination with Blue Sea ACRs. Supports AGM, flooded, gel, and TPPL batteries. Dimensions are 13.03 × 8.46 × 3.66 in, stud size M6, operating range −20°C to +70°C, weight 12.00 lb.
|
$ 1,511.66
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7565 C-Series circuit breaker is a triple-pole 50A AC magnetic hydraulic breaker with flat rocker actuator and trip-free design for 120/240V AC systems. It provides 5000A interrupt capacity for ABYC-compliant main protection and trips all poles simultaneously. Features include 1/4-20 tin-plated brass studs, 35 in-lb stud torque, −40°C to +85°C operating range, and 10,000 switching cycles.
|
Our managers will contact you and clarify the terms of the order
| ||
|
1-2 weeks delivery time The Blue Sea 7583 C-Series circuit breaker is a double-pole 80A AC magnetic hydraulic breaker with raised rocker actuator and trip-free design for 120/240V AC systems. It delivers 5000A interrupt capacity at 120V AC for ABYC main protection and trips both poles simultaneously if a fault occurs. Built with 1/4-20 tin-plated brass studs, 35 in-lb stud torque, −40°C to +85°C operating range, and rated for 10,000 switching cycles.
|
Our managers will contact you and clarify the terms of the order
| ||
|
1-2 weeks delivery time The Blue Sea 7601 M-Series Automatic Charging Relay (M-ACR) is a 12/24V DC dual-sensing relay rated 65A continuous, designed to manage alternator charging current up to 65A for two battery banks. It supports start isolation, combines at 13.6V, opens at 12.35–12.75V, includes 1/4"-20 (M6) tinned brass studs, supports cable sizes from 6 AWG to 1/0 AWG, and is IP67 waterproof. Operating current is 90mA (combine) and 15mA (open), with 115A intermittent rating (5 min).
|
$ 135.57
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7607 BatteryLink® Charger is a 12V DC 20A multistage charger with integrated 170A Automatic Charging Relay (ACR), designed to charge two isolated battery banks from 100–240V AC shore power or from the alternator via DC charging. It supports AGM, Flooded, and TPPL batteries, provides 3-stage charging (14.4V absorption / 13.5V float), includes temperature compensation, start isolation, and emergency parallel function. Features include European CEE 7/7 plug, 1 negative and 2 positive outputs, 1/4"-20 and 3/8"-16 studs, and 6.75 lb weight.
|
$ 704.03
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7610 SI-ACR is a 12/24V DC automatic charging relay rated at 120A continuous, designed to automatically combine batteries during charging and isolate them during discharge and engine starting. It features dual sensing, start isolation, IP67 sealing, and ignition protection. Supports alternators up to 120A, uses 3/8"-16 (M10) studs, requires 1/0 AWG cable, and has a 210A (5 min) intermittent rating. Weight: 1.25 lb.
|
$ 196.72
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7611 BatteryLink™ Automatic Charging Relay is a 12/24V DC auto-ranging ACR with 120A continuous and 210A (5 min) intermittent rating, designed to automatically share a single charging source between two battery banks. It features dual sensing, integrated LED status indicator, auxiliary battery priority mode, 3/8"-16 (M10) tinned copper studs with 7/8" length, support for cable sizes up to 1/0 AWG, and IP67 ignition-protected construction. Weight: 1.25 lb.
|
$ 186.89
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7615 ATD Automatic Timer Disconnect is a 12V DC multi-function battery management relay rated 120A continuous and 210A (5 min) intermittent. It can operate as Timer Disconnect, Low Voltage Disconnect, Automatic Charging Relay, or signal-controlled solenoid. It supports selectable disconnect delays from 5 seconds to 4 hours, low-voltage thresholds from 11.0–12.0V, and features 3/8"-16 (M10) tinned copper studs, IP67 ignition-protected housing, and support for cable sizes up to 1/0 AWG. Weight: 1.25 lb.
|
$ 243.67
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7620 ML-ACR Automatic Charging Relay is a 12V DC magnetic latching (bi-stable) relay rated 500A continuous, 700A (5 min) and 1450A cranking (30 sec) for automatic combining and isolation of two large battery banks. It features dual sensing, start isolation, engine isolation, start assist, and low standby draw (13mA, <40mA monitor). The unit uses 3/8"-16 (M10) tinned copper studs with 1.50" length, supports 4/0 AWG x2 cable, and includes SPDT Remote Control Contura Switch PN 2146. Operating range −10°C to +60°C, live current switching up to 300A @ 12V DC, weight 2.04 lb.
|
$ 418.86
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7621 ML-ACR is a 24V DC magnetic latching Automatic Charging Relay rated 500A continuous, 700A (5 min) and 1450A cranking (30 sec) for automatic combining and isolation of two large battery banks. It features dual sensing, start isolation, engine isolation, and start assist functions, with low holding current (13mA nominal) and <7A during state change. Built with 3/8"-16 (M10) tinned copper studs with 1.50" length, supports 4/0 AWG x2 cable, switching cycles 100,000, operating range −10°C to +60°C, and includes SPDT Remote Control Contura Switch PN 2146.
|
Our managers will contact you and clarify the terms of the order
| ||
|
1-2 weeks delivery time The Blue Sea 7623 ML-ACR is a 24V DC magnetic latching Automatic Charging Relay with manual control, rated 500A continuous, 700A (5 min), and 1450A cranking. It automatically combines and isolates two battery banks during charging, discharge, and engine start, and supports start assist, start isolation, and engine isolation modes. 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.
|
$ 447.57
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7635 m-LVD Low Voltage Disconnect is a 12V DC battery protection solenoid rated 65A continuous and 115A (5 min), designed to automatically disconnect non-essential loads when battery voltage drops below a set level. It features adjustable disconnect voltage, override and OFF modes via included remote switch, alarm output, IP67 waterproof housing, and supports cables up to 1/0 AWG on 1/4"-20 (M6) tinned brass studs with 7/16" length. Operating current is 95mA connected and 4mA open.
|
$ 180.34
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7649 Mini Add-A-Battery Kit 65A is a dual-battery management kit designed to control switching and automatic charging of two batteries from a single charge source. Rated at 65A, the kit includes an m-Series Mini Dual Circuit Plus™ Battery Switch and a 12/24V DC Automatic Charging Relay (ACR). It isolates engine and house circuits, supports emergency battery combining, and enables automatic charge sharing without regulator adjustment or rewiring. Weight: 1.00 lb (0.45 kg).
|
$ 222.93
-
+
| ||
|
1-2 weeks delivery time The Blue Sea 7650003 Add-A-Battery Kit is a dual-battery management system rated 120A, designed for boats with alternator output up to 120A. It includes an e-Series Dual Circuit Plus™ Battery Switch and a 12/24V SI-ACR Automatic Charging Relay to isolate start and house batteries while automatically managing charging. Weight: 2.36 lb (1.07 kg).
|
$ 299.74
-
+
| ||
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.