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BEP Marine

720-MDVSO

Battery coupler 720-MDVSO BEP

The BEP 720-MDVSO voltage-sensitive switch replaces the former 720-MDVS range by adding automatic 12/24V detection and an optical position sensor. Designed to handle 500A continuously and 2500A at startup, it lowers its coupling threshold to 13.3V to suit modern alternators. The unit ships with its 3-wire control cable fitted with a Wago plug for quick integration.

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£182.08 GBP

£182.08 GBP ~~£258.21 GBP~~

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In stock

Free pickup point from €150 in France
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Installers near you

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Technical specifications

Nominal voltage	12/24 V
Amperage	500.0
Nombre de circuits	1.0
Nombre de pôles	2 poles
Parcs de batteries supportés	2.0
Type d'interrupteur de batterie	Voltage-sensing electronics
Méthode de contrôle de l'interrupteur de batterie	Automatic and manual
Méthode de protection des circuits	Ignition protected (UL 1107)
VSR intégré	Oui
Courant continu nominal du DVSR	500.0
Mounting type	Flush or surface-mounted
IP rating	IP65
Display type	LED
Certifications	UL 1107, Ignition-protected
Taille maximale de cosse de câble	12 mm
Dimensions (W x H x D)	102 x 102 x 109 mm
Détection automatique de tension	Automatic (12V/24V)
Bulk/absorption charge voltage	13.3
Courant continu (A)	500 A
Type de contrôle	Automatic (voltage-sensitive) and manual (local/remote)
Courant de démarrage (A)	2500 A
Cut In Delay Seconds	5
Cut In Voltage 12v	13.3
Cut In Voltage 24v	26.6
Cut Out Voltage 12v	12.7
Digital Circuitry	Yes
Discharge cut-off voltage	12.7
Housing material	High-temperature fiberglass reinforced plastic
Courant intermittent (A)	700 A
Lowered Cut In Voltage Benefit	Suitable for low-efficiency alternators and high-temperature environments
Max charge current (A)	500.0
Max discharge current (A)	500.0
Maximale tension dc	32 V
Nom du modèle	720-MDVSO
Operating voltage range	8 to 30.5 V
Optical Position Sense	Yes
Peak discharge current	2500.0
Positions	Auto, Manual (On/Off), Emergency Parallel
Product use	Automatic management and coupling/decoupling of battery banks, with emergency parallel function.
Recommended continuous discharge current	500.0
Replaces Models	720-MDVS, 720-MDVS-24V
Switch type	Voltage Sensitive Switch (VSS) with dual operation
Terminal size	2 x 12 mm (1/2")
Type de borne	Fasteners (2 x 12mm)
Type de connexion câblage	3-wire cable with Wago plug (for control), studs (for power)

Detailed description

The 720-MDVSO battery separator coupler from BEP represents a major evolution in onboard energy management. Designed to replace the older 720-MDVS and 720-MDVS-24V models, this voltage-sensitive switch (VSS) now features automatic 12/24V dual-voltage detection, eliminating the need for manual configuration. Its design is based on advanced digital circuitry combined with an optical position sensor, ensuring increased precision and efficiency during battery bank coupling and decoupling cycles.

Electrical performance and optimized thresholds

This module supports extreme loads with a continuous capacity of 500A, 700A intermittently, and up to 2500A at startup. Unlike the previous generation, the 720-MDVSO lowers its activation voltage to 13.3V (26.6V for 24V systems) after a 5-second delay, making it perfectly suited for low-efficiency alternators and high-temperature environments. The cutoff voltage is set at 12.7V (25.4V) with a 20-second delay to prevent oscillations. Additionally, standby power consumption has been drastically reduced by 70%, dropping to less than 5mA at 12V.

Installation and marine safety

System integration is simplified by robust power connections via two 12 mm tinned copper studs and a 3-wire control harness equipped with a Wago plug. Certified to IP65 and ignition-protected according to UL 1107, the high-temperature fiberglass-reinforced plastic housing withstands the most severe marine conditions. The system also offers a remote emergency parallel function for 10 minutes, along with a full manual override control for absolute safety onboard.

Documentation

Type	Nom
	EN - Installation and Operating Instructions - BAT SW MDVS HD OPTIC 12/24V 500A MC6
	EN - Product Launch Press Release - BAT SW MDVS HD OPTIC 12/24V 500A MC6
	EN - Product Launch Press Release - BAT SW MDVS HD OPTIC 12/24V 500A MC6
	EN - User and Installation Instructions - BAT SW MDVS HD OPTIC 12/24V 500A MC6
	EN - Product Launch Press Release - BAT SW MDVS HD OPTIC 12/24V 500A MC6
	EN - User and Installation Instructions - BAT SW MDVS HD OPTIC 12/24V 500A MC6

Expert opinion

Pol CONIN

Digital Manager

« Optical reliability and optimized coupling thresholds for modern alternators »

As a marine electrical systems installer, switching to BEP’s 720-MDVSO model resolves many issues encountered with next-generation alternators. Lowering the coupling threshold to 13.3V finally enables optimal charging without nuisance tripping, especially in hot engine compartments where output voltage tends to drop. Adding an optical position sensor within the digital circuit mechanically improves the reliability of the motorized relay—a major advantage for large-capacity service facilities. Automatic 12/24V detection and the Wago connector significantly reduce wiring time, while standby parasitic draw is cut by a third compared to older models. This coupler is a robust industrial solution, capable of handling 2500A at startup, essential for installations requiring reliable emergency coupling.

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Battery coupler 720-MDVSO BEP

£182.08 GBP

£182.08 GBP ~~£258.21 GBP~~

Frequently Asked Questions

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What is the DC current capacity of this battery switch?

The BEP 720-MDVSO battery switch provides a DC current capacity of 500A DC.

What is the maximum supported cranking current?

This model is designed to support a cranking current up to 2500A DC.

Is this coupler compatible with 24V systems?

Yes, this switch is an automatic dual-voltage model. It automatically detects and adapts to operate on either 12V or 24V DC systems without any manual configuration required.

Can I connect a 12V battery bank with a 24V bank to the same device?

No, although the device is compatible with both 12V and 24V, the two battery banks must be of the same voltage (either both 12V or both 24V).

At what voltage does the automatic coupling activate?

The cut-in voltage has been lowered to suit low-efficiency alternators. It is:

13.3V for a 12V system26.6V for a 24V systemThe coupling occurs after a delay of about 5 seconds.

At what voltage does the battery isolation occur?

The cut-out voltage, which isolates the batteries to preserve charge, is:

12.7V for a 12V system25.4V for a 24V systemIsolation occurs after a delay of approximately 20 seconds.

Is the switch water- and dust-resistant?

Yes, the switch has an IP65 protection rating, making it resistant to water jets and fully protected against dust.

What is the size of the connection studs for power cables?

The device is equipped with two 12 mm (1/2") tinned copper studs to ensure safe high-current connections.

What are the mounting options for this switch?

The switch can be installed in two ways: flush-mounted or surface-mounted, depending on the configuration of your electrical panel or technical compartment.

What is the device's power consumption when in standby mode?

Standby power consumption (when the switch is in the "Off" position) is extremely low:

Less than 5 mA at 12V
Less than 5.5 mA at 24V

Is it possible to manually force the activation or deactivation of the switch?

Yes, the 720-MDVSO model has a full manual control (On and Off) allowing you to bypass the automatic system if needed.

What do the colored wires correspond to for the control connection?

The control wiring uses the following colors:

Red: Wire for optional status LEDGreen: Control wire from optional remote switchBlack: Negative power supply (ground)

How does the emergency parallel function work?

The device includes a 10-minute emergency parallel function. If a remote switch is installed, this function temporarily couples the batteries to start the engine if the main battery is dead.

Can this switch be installed in a gasoline engine compartment?

Yes, the switch is ignition-protected and meets UL 1107 safety standards, allowing safe installation in environments with flammable vapors.

Does the device detect load on both battery banks?

Yes, this model features dual detection (Dual Sensing). It will parallelize the battery banks if either bank receives sufficient charge (e.g., via a shore charger or alternator).