Blue Sea Systems 7622 ML-ACR Automatic Charging Relay 12V 500A

The Blue Sea Systems 7622 ML-ACR (Magnetic Latch-Automatic Charging Relay) is a 500-amp heavy-duty battery management solution designed for marine applications with large battery banks. This bi-stable relay automatically combines batteries during charging and isolates them when discharging or starting the engine, ensuring optimal battery performance and longevity.

Advanced Battery Management:

When paired with the ML-RBS Remote Battery Switch (sold separately), the ML-ACR provides complete push-button battery management. The system automatically shares charge from an engine's alternator between start and auxiliary batteries while offering emergency combine functionality to assist with starting when the engine battery is low. The included Contura-style remote switch offers three modes: ON (manual combine), AUTO (automatic charging management), and OFF (isolation).

Key Features:

• Dual sensing technology monitors charge status in each battery bank independently
• Selectable Start Isolation or Engine Isolation modes protect sensitive electronics during current spikes
• Ignition protected design (ISO 8846, SAE J1171) allows installation in gasoline engine compartments
• Ultra-low current draw (less than 40mA) for monitoring with minimal battery drain
• Remote switch operation eliminates costly heavy-gauge cable runs throughout the vessel
• Manual override lever provides emergency control if remote power is compromised
• LED indicators clearly display current operating mode
• Compatible with Blue Sea Systems 9160 Paralleling Link Bus for multiple switch configurations
• IP66 rated for water and dust resistance

Technical Specifications:

• Continuous rating: 500 amps
• Intermittent rating: 700 amps
• Live current switching: 300A at 12V DC
• Recommended cable size: 4/0 AWG
• Terminal stud size: 3/8 inch
• Operating current: 13mA (less than 7A when changing state)
• Weight: 4 lbs
• CE marked, lifetime warranty

This professional-grade ACR eliminates the need for external voltage regulators or isolators, providing efficient single-source charging for dual battery banks while maintaining proper isolation to prevent accidental discharge and protect sensitive marine electronics.