Blue Sea Systems 7611 Automatic Charging Relay, 120A Continuous, 12/24V DC Auto-Ranging

The Blue Sea Systems 7611 is an Automatic Charging Relay (ACR) that combines a starting battery and a house battery bank whenever a charge source is present, then automatically isolates them once charging stops or a load exceeds the charge input. This lets a single alternator, shore charger, or solar controller keep multiple battery banks topped up without manual switching, while protecting the engine-start battery from being drained by house loads. The 7611 is rated for a 12/24V DC auto-ranging voltage input, so the same relay works correctly on either a 12 volt or a 24 volt system without configuration. It uses an electromechanical, quick-connect contact design with silver contacts for reliable, low-resistance switching, and operation is fully automatic based on sensed voltage at each battery bank. An integrated LED indicates the ACR status at a glance, and the housing includes side and bottom knockouts for cable connections, simplifying installation in tight helm, engine bay, or battery compartment spaces. Built for continuous marine duty, the relay carries a 120 amp continuous current rating with a 210 amp intermittent rating, giving it headroom for charging surges and simultaneous loads. The 7611 is finished in black and yellow for easy identification among other electrical components onboard. It is designed as a drop-in battery combiner for boats running dual-battery or house/start battery configurations that need automatic, hands-off combining logic.

Specifications

• Brand: Blue Sea Systems
• Manufacturer Part Number: 7611
• Continuous Current Rating: 120 Amps
• Intermittent Current Rating: 210 Amps
• Voltage Input: 12/24 Volt DC, auto-ranging
• Wattage: 1440 watts
• Connector Type: Quick Connect
• Contact Material: Silver
• Contact Type: Electromechanical
• Mounting Type: Surface mount or panel mount
• Operation Mode: Automatic
• Coil Voltage: 24 Volts
• Coil Resistance: 100 Milliohms
• Minimum Switching Voltage: 12 Volts (DC)
• Number of Terminals: 2
• Color: Black, Yellow
• UPC: 632085076115
• Weight: 1.25 pounds

Frequently Asked Questions

What does the Blue Sea Systems 7611 ACR do? It automatically combines a starting battery and a house battery bank whenever a charge source is present and connected loads do not exceed the charge input, then isolates the banks again once charging stops, so the 7611 keeps both banks charged without a manual battery switch.

Will the 7611 work on a 24 volt boat as well as a 12 volt boat? Yes. The Blue Sea Systems 7611 has a 12/24V DC auto-ranging voltage input, so it senses and operates correctly on either a 12 volt or a 24 volt system without any manual configuration.

What is the continuous current rating of the 7611? 120 amps continuous, with a 210 amp intermittent rating, which is the current-handling capacity of the Blue Sea Systems 7611 Automatic Charging Relay.

How much does the 7611 weigh? The Blue Sea Systems 7611 weighs 1.25 pounds.

Is the 7611 a manual switch or does it operate automatically? The 7611 operates automatically. Its operation mode senses battery voltage and charge presence and closes or opens the relay contacts without any manual input from the operator.

What type of contacts does the 7611 use? The Blue Sea Systems 7611 uses electromechanical contacts made of silver, connected through a quick-connect terminal design with 2 terminals.

How do I know if the 7611 is actively combining the batteries? The 7611 has an integrated LED that indicates ACR status, giving a visual signal of when the relay is combining the battery banks.

How are cables connected to the 7611, and where does it mount? The Blue Sea Systems 7611 has side and bottom knockouts for cable connections and can be installed as a surface mount or panel mount unit.

What color is the 7611 housing? The 7611 is finished in black and yellow.

What is the wattage rating of the 7611? 1440 watts, which corresponds to the Blue Sea Systems 7611's 120 amp continuous current rating.

What is the minimum switching voltage for the 7611? 12 Volts DC is the minimum switching voltage for the Blue Sea Systems 7611 Automatic Charging Relay.