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BEP Marine

710-140A

VSR digital 12/24 V 140 A

The BEP VSR DIG 12/24V MC20 is a digital voltage sensing relay (DVSR) that automatically manages the charging of two battery banks. It automatically selects 12V or 24V DC, with a continuous capacity of 125A. This digital model replaces the older 710-125A and 710-125A-DS units, offering improved accuracy and a zero-consumption storage mode. The product is supplied with its cable harness and an installation guide.

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88,50€

88,50€ ~~111,30€~~

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Free pickup point from €150 in France
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Technical specifications

Product use	Digital voltage sensing relay for automatic dual-battery management
Switch type	Digital voltage sensing relay
Continuous current (A)	125
Intermittent current (A)	140
Cranking current (A)	140 A
Maximum DC voltage	32
Number of poles	1
Positions	Auto, Combined, Separate, Storage
Wiring connection type	3-wire connection (studs and wire)
Control type	Automatic (digital voltage detection)
IP rating	Water-resistant
Operating voltage range	12V DC / 24V DC
Coil voltage	12V DC or 24V DC (auto-detect)
Coil current (mA)	1.8
Alternator Sizing Example Alternator Max A	77
Alternator Sizing Example Alternator Min A	44
Alternator Sizing Example Bank Ah	220
Alternator sizing guide	20% to 35% of the battery bank capacity in Ah
Alternator Sizing Percentage Max	35
Alternator Sizing Percentage Min	20
Automatic voltage detection	Yes
Product barcode	50843687004740
Certifications	UL 1107, CE
Certifications Standard Ul	UL 1107
CE certification	Yes
Continuous current rating	125
Digital Technology Type	Digital
Disengagement voltage (12V)	12.8
Disengagement voltage (24V)	25.6
Dual battery bank sensing	Yes
Dvsr Status Disengaging Indication	Flash every 5 seconds
Dvsr Status Engaged Indication	On
Dvsr Status Error Indication	Fast Flash
Emergency parallel function	Yes
Engagement voltage (12V)	13.4
Engagement voltage (24V)	26.8
Intermittent current rating	140
Discontinued item	No
Manufacturer email	enquiries@bepmarine.com
Manufacturer Fax	+64 9 415 9327
Manufacturer phone	+64 9 415 7261
Manufacturer Reference	710-140A
Manufacturer website	www.bepmarine.com
Maximum system voltage	32
Optional Switching Circuit Support	Yes
Product category level 1	Battery Management
Product category level 2	Charge Relays
Product category level 3	Charge Relays
Long product description	The BEP VSR DIG 12/24V MC20 is a digital voltage sensing relay (DVSR) designed for automatic and reliable management of dual battery systems on board. Unlike older analog relays such as the BEP 710-125A it replaces, this model...
Short product description	BEP Digital Voltage Sensing Relay (DVSR) 12/24V
Model name	[BEP] VSR digital 12/24V 140A
Product range	710
Product type	Voltage Sensing Relay
Product weight	0.3
Recommended Cable Size 1m 125a Awg	10
Recommended Cable Size 1m 125a Mm2	6
Recommended Cable Size 2m 125a Awg	7
Recommended Cable Size 2m 125a Mm2	10
Recommended Cable Size 7m 125a Awg	3
Recommended Cable Size 7m 125a Mm2	25
Relay Max Power Dc	4480
Remote LED output	Yes
Replaces Models	BEP 710-125A
Standby Current 24v Ma	1.6
Standby current (mA)	1.8
Start Battery Protection	Yes
Stock Level	Limited
Storage mode power consumption	0
UL certification	Yes
Voltage Drop 1m 125a Percent	3
Voltage Drop 2m 125a Percent	3.5
Voltage Drop 7m 125a Percent	4.6
Water resistance type	Water-resistant (not submersible)

Detailed description

The BEP VSR DIG 12/24V MC20 is a digital voltage sensing relay (DVSR) designed for automatic and reliable management of dual batteries aboard. Unlike older analog relays such as the BEP 710-125A it replaces, this model integrates digital technology that provides increased precision in trigger thresholds and reduced power consumption. It ensures priority charging of the starter battery before automatically combining the service battery, thus protecting the engine against unintended discharge.

Digital technology and voltage versatility

The DVSR stands out for its ability to operate in both 12V and 24V DC with automatic selection, making it ideal for a wide range of vessels, from small sailboats to motorboats. Its digital design guarantees precise switching at programmed voltages: engagement at 13.4V (12V) / 26.8V (24V) and disengagement at 12.8V (12V) / 25.6V (24V). Compared to a simple coupler or diode isolator, it introduces no voltage drop, maximizing alternator charging efficiency.

Performance and current capacity

With a continuous current capacity of 125 A and an intermittent current of 140 A, this relay is suitable for most onboard charging systems. Its robust design, certified to UL 1107 and CE standards, ensures long-term reliability in demanding marine environments.

Low standby consumption and storage mode

A key advantage of this digital model is its extremely low standby consumption of just 1.8 mA (1.6 mA at 24V). Additionally, thanks to an optional switching circuit, it can be placed in storage mode at 0 W, which is essential for preserving the battery during winter storage or long periods of inactivity—a feature absent in older models.

Installation and system integration

The VSR DIG 12/24V MC20 connects simply with three wires, leaving the alternator wiring intact. It comes with an optional output for a remote status LED indicator, enabling easy monitoring of battery combination status. It can also be paired with an ignition switch to activate storage mode, offering maximum integration flexibility.

Documentation

Type	Nom
	EN - Instructions d'installation - VSR DIG 12/24V MC20
	EN - Guide d'installation et d'utilisation - VSR DIG 12/24V MC20

Expert opinion

Pol CONIN

Digital Manager

« A reliable and versatile digital VSR for hassle-free battery management »

The BEP VSR DIG 12/24V MC20 is a significant digital evolution compared to the older relays in the 710 series. As an installer, I find its ability to auto-select voltage (12V or 24V) greatly simplifies stock management and prevents mounting errors. The technical highlight is its zero-consumption storage mode, activated via an optional switching circuit; this is essential for boats left at the dock for long periods. The trigger thresholds are precise and reliable, and the fact that it is UL 1107 certified is a quality assurance for a worry-free installation. It advantageously replaces the 710-125A and 710-125A-DS models.

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VSR digital 12/24 V 140 A

88,50€

88,50€ ~~111,30€~~

Frequently Asked Questions

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What is the BEP VSR DIG 12/24V MC20 digital voltage sensing relay (DVSR)?

The BEP VSR DIG 12/24V MC20 digital voltage sense relay (DVSR) is a bidirectional device essential for autonomous battery bank management on board vessels. It uses advanced digital technology to intelligently combine and isolate battery banks, ensuring optimal charging and protecting the starter battery from discharge.

What is the primary function of the VSR DIG 12/24V MC20?

The primary function of the VSR DIG 12/24V MC20 is to manage battery charging by detecting voltage. It automatically connects battery banks when the charging voltage reaches a set threshold (engagement) and disconnects them when the voltage drops below another threshold (disengagement), thus protecting the starter battery while allowing auxiliary batteries to charge.

Which operating voltages are supported by this relay?

This relay is multi-voltage and automatically selects between 12V DC and 24V DC systems. The maximum supply voltage it can handle is 32V DC.

What is the maximum continuous DC current that the VSR DIG 12/24V MC20 can handle?

The VSR DIG 12/24V MC20 can handle a continuous current of 125 Amperes and an intermittent current of 140 Amperes.

What is the power consumption of this relay in standby mode and in storage mode?

In standby mode, power consumption is 1.8 mA (or 1.6 mA for a 24V DC system). In storage mode, power consumption is 0 mA.

What are the engagement and disengagement voltages for a 24V DC system?

For a 24V DC system, the relay engages when the voltage reaches 26.8V DC. It disengages when the voltage drops to 25.6V DC.

Can this relay be used with any type of battery?

The relay is designed to operate with 12V DC or 24V DC battery systems. It is compatible with most types of marine batteries, but it is always recommended to consult the installation manual for detailed specifications and specific configurations.

How to choose the alternator size relative to the battery bank?

The alternator's current output should be between 20% and 35% of the battery bank size in Ampere-hours (Ah). For example, for a 220 Ah battery bank, the alternator should have an output between 44 and 77 Amps.

Is the VSR DIG 12/24V MC20 compatible with 32V DC systems?

The relay is designed to operate with 12V DC or 24V DC systems and automatically detects the voltage. The maximum supply voltage it can handle is 32V DC, meaning it can tolerate voltage spikes up to this value, but its nominal operation is for 12V or 24V.

How to check if the relay is engaged and batteries are combined?

When the relay is engaged and the battery banks are combined, the LED status light remains continuously lit.

What does rapid flashing of the LED indicator mean?

A rapid flashing of the LED indicator means the system voltage is either too high or too low. Check the electrical system to identify the cause.

What does a brief LED flash every 5 seconds indicate?

A brief LED flash every 5 seconds indicates that the relay is disengaging, i.e., the battery banks are about to be isolated.

Is it possible to control the relay remotely or set it to storage mode?

Yes, the relay has an optional switching circuit that allows activating the DVSR or switching it to a zero-power storage mode, which protects the starter batteries from discharge.

Is there an output for a remote LED status indicator?

Yes, the relay has an output for an optional remote-mounted LED status indicator, allowing you to view the relay's state from another location.

Is the provided wiring diagram sufficient for a complete installation?

The provided wiring diagram is a guide showing DVSR connections. It is not intended to be a complete electrical system wiring diagram. It is recommended to consult a professional or a full installation manual for the entire system.

Where should the relay be mounted for optimal performance?

The relay is water-resistant but not designed to be submerged. It must be installed in a dry, protected location, shielded from direct splashes and extreme temperatures, while remaining accessible for inspection and maintenance. Ensure adequate ventilation around the device.