Blue Sea 7611 DC BatteryLink™ Automatic Charging Relay - 120 Amp w/Auxiliary Battery Charging

The Blue Sea 7611 DC BatteryLink™ Automatic Charging Relay is a 120-amp continuous-rated voltage-sensitive relay designed to manage independent battery banks in dual-battery systems. This intelligent charging relay automatically senses when your primary battery is being charged and routes that charging current to an auxiliary or secondary battery bank, eliminating the need for manual switching or constant monitoring. It's the standard-duty choice for vehicles, marine vessels, and off-grid power systems where reliable automatic battery management is essential.

The 7611 handles both 12V and 24V DC systems with auto-ranging voltage input, making it versatile across different platform configurations. Its 120-amp continuous rating accommodates high-output alternators and fast-charging systems without relay chatter or thermal stress. The relay features side and bottom cable knockouts for flexible installation geometry, 7/8-inch stud length to accept multiple terminal styles, and a clip-on cover to insulate terminal connections in high-vibration environments. An integrated LED indicator provides real-time ACR status feedback, allowing operators to confirm the relay is functioning without additional instrumentation.

This relay is ideal for overlanding rigs, emergency response vehicles, marine auxiliary power systems, and any application requiring hands-free battery management across two independent banks. Field teams and off-road operators rely on automatic charging relays to maintain secondary battery health during extended missions or remote operations where manual intervention isn't practical. The 7611's proven design and marine-grade construction make it suitable for corrosive environments, including saltwater installations.

Blue Sea Systems is recognized in the marine and automotive electrical market for manufacturing voltage-sensitive relays that meet strict reliability standards. The 7611 is a workhorse component in systems where power continuity and automatic load balancing between battery banks are non-negotiable.