m-Series Automatic Charging Relay - 12/24V DC 65A - m-Series Automatic Charging Relay - 12/24V DC 65A

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Blue Sea Systems

7601-BSS

Automatic charge relay series m - 12/24 V DC 65 A

Designed for automatic management of two battery banks, the Blue Sea m-Series 7601 charge relay handles 12/24V systems with 65A continuous current.

Its start-up isolation function protects onboard electronics from voltage drops. This model is part of Blue Sea’s m-Series, known for its reliability.

Includes: an insulating cover and a quick-connect ground terminal.

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£71.04 GBP

£71.04 GBP ~~£76.82 GBP~~

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In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

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Support service

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Technical specifications

Nominal voltage	12/24 V
IP rating	IP67
Battery Banks	2.0
Combine Voltage	12V DC: 13.6V DC (30 sec) or 13.0V DC (2 min); 24V DC: 27.2V DC (30 sec) or 26.0V DC (2 min)
Courant continu (A)	65.0
Protection anti-déflagrante	Oui
Ignition Protection Standards List	ISO 8846, SAE J1171
Intermittent Current 5min	115
Mounting Cutout Diameter Front Mm	67
Mounting Cutout Diameter Rear Mm	59
Mounting type	Surface, stern or panel
Open Voltage	12V DC: 12.35V DC (10 sec) or 12.75V DC (30 sec); 24V DC: 24.7V DC (10 sec) or 25.5V DC (30 sec)
Over Voltage Lockout Threshold 12v	16.0V DC
Product Application Scenario	marine, recreational vehicles, off-grid power systems
Type de relais	Automatic charge relay (ACR)
Start Isolation	Oui
Undervoltage Lockout Threshold 12v	9.5V DC
Undervoltage Lockout Threshold 24v	19.0V DC
Undervoltage Reset Threshold 12v	10.0V DC
Undervoltage Reset Threshold 24v	20.0V DC

Detailed description

Designed for automatic management of dual-battery bank systems, the Blue Sea m-Series 7601 Automatic Charging Relay (ACR) ensures efficient power distribution for 12V DC or 24V DC installations. This model is ideal for motorboats, recreational vehicles, and off-grid power systems requiring a continuous charge capacity of up to 65 amperes and 115 amperes intermittent (5 minutes).

Features and technical performance

The m-Series 7601 automatically combines batteries during charging and isolates them during discharge or shutdown, optimizing power availability and protecting the starter battery. With dual-sensing capability, it detects a load on either battery bank. It includes a Start Isolation (SI) function that safeguards sensitive electronic equipment from voltage drops and spikes during engine start-up. Compared to traditional diode-based battery isolators, ACRs like the 7601 offer superior efficiency, generating less heat and consuming minimal charge energy.

Safety and installation

This relay is flame-resistant, compliant with external ignition protection requirements per ISO 8846 and SAE J1171, making it safe for installation on gasoline-powered boats. Its IP67 rating ensures protection against temporary immersion up to 1 meter for 30 minutes. Voltage thresholds for combining are 13.6V DC (30 sec) or 13.0V DC (2 min) for 12V systems, and 27.2V DC (30 sec) or 26.0V DC (2 min) for 24V systems. Isolation occurs at 12.75V DC (30 sec) or 12.35V DC (10 sec) for 12V systems. It features 1/4"-20 (M6) stud terminals and accepts cables up to 1/0 AWG, with a recommended size of 6 AWG (16 mm²) to meet nominal current ratings. An integrated LED indicator provides visual status updates on ACR modes, including charging, isolation, undervoltage, and fault conditions. A removable insulating cover and a 1/4" x .032" quick-connect ground terminal are included to simplify installation and protect terminals.

Documentation

Type	Nom
	EN - Diagnostic Flowchart - m-Series Automatic Charging Relay - 12-24V DC 65A
	EN - Dimension Drawing - m-Series Automatic Charging Relay - 12-24V DC 65A
	EN - Instructions - m-Series Automatic Charging Relay - 12-24V DC 65A
	EN - Choose The Right ACR - m-Series Automatic Charging Relay - 12-24V DC 65A
	EN - Certificate - m-Series Automatic Charging Relay - 12-24V DC 65A

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis: Blue Sea m-Series 7601 automatic charging relay »

The Blue Sea m-Series 7601 automatic charging relay (ACR) is a key component for optimizing energy management on vessels equipped with two battery banks, typically a starter battery and a house battery. Its ability to operate on 12V or 24V DC systems with a continuous current of 65A makes it a reliable solution for medium-sized alternators, commonly found on outboard motors or small inboard engines. This model is particularly relevant for recreational boaters seeking fully automated charging without manual intervention.

One of the major advantages of the 7601 is its Start Isolation (SI) function. This feature effectively protects sensitive onboard electronics by temporarily isolating the house circuit from the starter circuit, preventing harmful voltage fluctuations. Installation is relatively straightforward for a marine electrician, requiring positive connections with appropriate fuses, grounding, and the optional SI line connection. It is crucial to adhere to the recommended cable sizes (minimum 6 AWG) and ensure installation in a protected location, although its IP67 certification provides good resistance to marine environments.

Compared to higher-capacity models in the same series (such as the 7610/7611 at 120A or the 7620/7622 at 500A), the 7601 is specifically suited for applications where alternator output does not exceed 65A, offering a balance between performance, compactness, and cost. It does not replace a battery switch for emergency starting but optimizes daily charging. It is therefore ideal for cruising sailboats or small powerboats where simplicity and reliability in charge management are priorities, without the constraints of a more complex or oversized system. It is important to note that this model is not designed to handle engine starting currents.

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Automatic charge relay series m - 12/24 V DC 65 A

£71.04 GBP

£71.04 GBP ~~£76.82 GBP~~

Frequently Asked Questions

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What is an automatic charge relay (ACR) and how does the Blue Sea m-Series 7601 work?

The Blue Sea m-Series 7601 automatic charge relay (ACR) is designed to automatically manage dual-battery bank systems. It combines batteries during charging for efficient power distribution and isolates them during discharge or shutdown, protecting the starter battery and optimizing energy availability.

What are the continuous and intermittent current ratings of this charge relay?

This automatic charge relay has a continuous current rating of 65 amperes. Its intermittent current rating is 115 amperes, maintained for 5 minutes.

Is the Blue Sea m-Series 7601 relay suitable for 12V and 24V systems?

Yes, the Blue Sea m-Series 7601 automatic charge relay is designed to operate with 12V DC or 24V DC electrical systems.

What are the main functions of the m-Series 7601 charge relay?

Main functions include automatic battery combining during charging, battery isolation during discharge, dual charge detection on either battery bank, and a start isolation (SI) function to protect sensitive electronic equipment.

How does the m-Series 7601 charge relay ensure the safety of electronic equipment during engine start?

The relay includes a Start Isolation (SI) function that protects sensitive electronic equipment from voltage drops and spikes that can occur during engine start.

What is the efficiency of the m-Series 7601 charge relay compared to traditional battery isolators?

Compared to traditional diode-based battery isolators, the m-Series 7601 charge relay offers superior efficiency. It generates less heat and consumes minimal charge energy.

Is this relay spark-protected for use on gasoline-powered boats?

Yes, this relay is flame-resistant and meets the external ignition protection requirements of ISO 8846 and SAE J1171, making it safe for installation on gasoline-powered boats.

What is the water and dust protection rating of this charge relay?

The Blue Sea m-Series 7601 automatic charge relay is rated IP67, providing protection against temporary immersion up to 1 meter for 30 minutes.

Where is the best place to install the m-Series 7601 charge relay?

To prevent corrosion of wires and connection terminals, it is recommended to install the relay in a dry and protected location if possible. Avoid mounting it directly above battery banks.

What is the recommended torque for the stud terminals?

The recommended torque for stud terminals is 60 in-lbs (6.8 Nm).

What type of cable and fuse should I use to connect the charge relay?

For a continuous charge capacity of 65 amperes, use a cable with a minimum size of 6 AWG (16mm²) and a 90A–100A fuse. The maximum supported cable size is 1/0 AWG (50mm²).

How to connect the start-isolation line (SI)?

The start-isolation line (SI) must be connected to the terminal or wire running from the ignition switch to the starter solenoid. This connection must be live only during starting and must be made via an inline fuse of one to ten amperes.

Can the m-Series 7601 charge relay be used for engine starting currents?

No, the m-Series 7601 charge relay is not designed to handle starting currents. If batteries need to be combined for emergency starting, a battery switching system with combine/parallel function must be used.

How to connect the positive terminals of battery banks to the relay?

Connect the positive terminal of one battery bank to one of the 1/4"-20 studs, and the positive terminal of the other battery bank to the other 1/4"-20 stud. Both positive connections must be made through appropriately sized circuit protection (fuse).

How to connect the ground (GND) terminal of the relay?

The quick-connect terminal marked GND (ground) must be connected to the DC system ground via a 1 A inline fuse. This prevents fault currents in this wire.

What is the maximum alternator capacity supported by this charge relay?

This automatic charge relay can support alternators up to 65 amperes.

What are the voltage thresholds for the battery combiner relay to combine batteries in a 12V system?

In a 12V system, the relay will combine the batteries if the voltage at either terminal is above 13.6V DC for 30 seconds or above 13.0V DC for 2 minutes.

At what voltage are the batteries isolated in a 24V system?

In a 24V system, batteries are isolated when the voltage at either terminal drops below 25.5V DC for 30 seconds or below 24.7V DC for 10 seconds.

Does the relay have undervoltage or overvoltage protection?

Yes, the relay includes undervoltage protection (lockout at 9.5V DC for 12V systems and 19V DC for 24V systems) and overvoltage protection (lockout at 16.0V DC for 12V systems).