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Blue Sea Systems 7623 ML-ACR Automatic Charging Relay 500A 24V with Manual Control

Manufacturer

Blue Sea Systems

<p>When electrical reliability can mean the difference between a successful voyage and a dangerous situation, marine professionals and enthusiasts turn to Blue Sea Systems. Founded in 1992, this American manufacturer has built a reputation for creating electrical components specifically engineered to withstand the unforgiving marine environment. Every product reflects a commitment to safety standards and real-world performance that has made Blue Sea Systems a leading name in marine and specialty vehicle electrical systems.</p> <h3>Engineering for the Marine Environment</h3> <p>Blue Sea Systems develops and manufactures dependable AC and DC electrical products for marine and specialized vehicle applications, designed in the USA and engineered to excel in challenging environments. The marine environment presents unique challenges—salt spray, constant vibration, temperature extremes, and moisture exposure—that can quickly degrade inferior electrical components. Blue Sea Systems addresses these challenges through careful material selection, rigorous testing protocols, and designs that prioritize both safety and serviceability. Their components are engineered for marine use and align with the intent of ABYC E-11: AC and DC Electrical Systems on Boats and relevant USCG electrical regulations.</p> <h3>Commitment to Safety Standards</h3> <p>Safety standards aren't just guidelines for Blue Sea Systems—they're fundamental to every product design. All Blue Sea Systems marine battery disconnect switches comply with the ABYC C-7 certification, demonstrating their commitment to meeting and exceeding industry safety requirements. The company maintains ABYC-certified employees across multiple departments, from engineering to technical support, ensuring deep expertise in marine electrical system design and installation standards.</p> <h3>Comprehensive Product Range</h3> <p>Blue Sea Systems offers an extensive catalog designed to address every aspect of marine electrical systems. Their <a href="/7262-blue-sea-systems-circuit-breakers-200260">circuit breakers</a> provide resettable overcurrent protection with trip-free designs and clear trip indication for quick diagnostics. For power management, their <a href="/7262-blue-sea-systems-battery-switches-manual-200149">battery switches</a> offer reliable methods for controlling battery banks and disconnecting loads during storage or emergencies, with ABYC C-7 compliance guaranteed.</p> <p>Monitoring system health is critical aboard any vessel, which is why their <a href="/7262-blue-sea-systems-battery-monitors-volt-meters-200146">battery monitors and volt meters</a> provide accurate real-time data to help operators make informed decisions about power usage and charging. The company's <a href="/7262-blue-sea-systems-terminal-blocks-bus-bars-201059">terminal blocks and bus bars</a> create organized, serviceable connection points that simplify installation and future modifications. For keeping batteries properly charged, Blue Sea Systems offers <a href="/7262-blue-sea-systems-battery-chargers-200141">battery chargers</a> engineered with features like automatic charging relay compatibility and proper charge profile management.</p> <h3>Built by Boaters, for Boaters</h3> <p>Blue Sea Systems was founded based on a commitment to create innovative high quality marine electrical products to improve the safety, simplicity, and reliability of boating, with employees who are active boaters applying their passion to designing, developing, and building products. This firsthand experience translates into practical features like modular layouts, standardized footprints, and installer-centric designs that streamline panel work and serviceability. The result is a product line that addresses real challenges faced on the water, backed by comprehensive technical documentation and support resources that help both professionals and DIY enthusiasts complete installations with confidence.</p>

Part Number

7623
06/01/2036 12:55 PM
Sale Price

$226.76

In Stock (10+)

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Usually delivered within 2 days

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Live-in-stock inventory

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Fitment guaranteed

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Product Details

The Blue Sea Systems 7623 ML-ACR (Magnetic Latch-Automatic Charging Relay) is a 500-amp heavy-duty battery management solution designed for 24V marine electrical systems. This intelligent relay automatically combines battery banks during charging to share alternator output, then isolates them during discharge to prevent accidental drain and protect sensitive electronics.

Advanced Battery Management:

The ML-ACR uses magnetic latching (bi-stable) technology that draws minimal current—less than 40mA when monitoring voltage in either the ON or OFF state. It only draws moderate current briefly when changing states, making it highly efficient for continuous operation. The dual-sensing design monitors voltage in each battery bank independently to ensure optimal charging performance.

Flexible Control Options:

The included Contura-style remote switch offers three operating modes: ON for emergency battery combining, AUTO for automatic charge management, and OFF for complete isolation. Users can configure the system for either Start Isolation (protecting house bank electronics) or Engine Isolation (protecting engine control systems) depending on their specific needs. The remote switch requires only 20 AWG wire, eliminating expensive heavy-gauge cable runs. A manual override lever on the relay provides backup control if remote switch power is lost.

Key Features:

  • Magnetic latching technology for ultra-low power consumption
  • Dual voltage sensing monitors both battery banks independently
  • 500A continuous rating, 700A intermittent rating
  • 300A live current switching capability at 12V DC
  • Ignition protected for installation in gasoline engine compartments
  • Remote switch with LED indicators shows current operating mode
  • Emergency combine function for starting with low batteries
  • Compatible with ML-RBS Remote Battery Switch and 9160 Paralleling Link Bus
  • Requires dual 4/0 AWG cable for full rated capacity
  • 3/8-inch terminal studs for secure connections

Technical Specifications:

  • Nominal voltage: 24V DC
  • Operating current: 13mA (less than 7A when changing state)
  • Continuous rating: 500 amps
  • Intermittent rating: 700 amps
  • Live current switching: 300A @ 12V DC
  • Weight: 1 lb
  • IP66 rated for dust and water resistance
  • Meets ISO 8846 and SAE J1171 ignition protection standards
  • CE marked

The Blue Sea Systems ML-ACR is designed for professional marine installations requiring reliable battery management in large dual-bank systems. Its compact design mounts close to batteries to minimize cable runs, while the remote switch can be installed at the helm for convenient operation. Backed by Blue Sea Systems' lifetime warranty.

Products specifications

Amperage

1450 Amps DC Cranking700 Amps Intermittent500 Amps Continuous

Type

Relay

Voltage

24 Volts DC

Best Use

Continuous DutyIntermittent

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