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.
