m-LVD Low Voltage Disconnect - Dimensioned Drawing

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Blue Sea Systems

7635-BSS

Low-voltage disconnect m-LVD

The Blue Sea m-LVD low-voltage disconnect is an automatic solution to protect your 12V DC batteries from deep discharge by cutting non-essential loads. It offers an adjustable disconnect voltage range from 11.3V to 12.1V and IP67 certification. This product includes the PN 7928 remote control switch and a rear insulating cover.

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£94.09 GBP

£94.09 GBP ~~£102.19 GBP~~

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

Custom installation

Trust Skysat to install the equipment on board

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Installers near you

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Support service

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Technical specifications

Nominal voltage	12
Terminal size	M6 (1/4"-20)
IP rating	IP67
Protection AFD	No
Alarm Time Before Disconnect	5
Courant continu (A)	65.0
Type de contrôle	Remote switch
Dimensions (W x H x D)	70 x 70 x 50
Disconnect Voltage Range	11.3V - 12.1V
Factory Default Disconnect Voltage	12.1
Courant intermittent (A)	115 (5 min)
Verrouillable à clé	No
Mounting type	Surface, front panel or rear panel
Nombre de pôles	1
Operating Current Connected Ma	95
Operating Current Open Ma	4
Operating voltage range	11.3V - 13.5V DC (nominal 12V DC)
Diamètre de découpe du panneau	58.7
Positions	Disconnect voltage adjustment, Override, Stop
Product use	Automatically disconnects non-essential loads to preserve the battery and ensure engine start-up.
Reconnect Voltage	13
Remote Control Switch Included	Yes
Switch type	Automatic low-voltage disconnect
Type de borne	Threaded stud
Time Delay To Alarm	5
Total Disconnect Delay	10
Type de connexion câblage	Stud mount

Detailed description

Designed for intelligent power management of 12V DC systems, the BLUE SEA m-LVD Low Voltage Disconnect is an automatic low-voltage disconnect device. It protects batteries from deep discharge by automatically cutting non-essential loads when battery voltage drops below a preset threshold. This function preserves energy needed for engine start or extends battery life.

Technical Specifications and Key Features

The m-LVD operates at a nominal voltage of 12V DC, with a continuous current rating of 65A and an intermittent rating of 115A for 5 minutes. Its disconnect voltage is adjustable from 11.3V to 12.1V, with a factory setting of 12.1V. The system includes a 5-minute delay before activating an alarm (if optional) when voltage falls below the threshold, followed by an additional 5-minute delay before effective disconnection, totaling 10 minutes. Reconnection occurs automatically when voltage exceeds 13.0V for 2 minutes or 13.5V for 30 seconds. Operating current is 95mA when connected and 4mA when open.

The disconnect device ships with the PN 7928 remote control switch, which allows adjustment of the disconnect voltage, activation of an "Override" mode delaying disconnection by 10 minutes, or manual circuit cutoff via the "OFF" function. The switch also disables the optional audible alarm. The m-LVD is IP67 rated for temporary immersion and meets external ignition protection requirements per ISO 8846 and SAE J1171. It supports cables up to 1/0 AWG (50mm²) with 1/4"-20 (M6) terminal studs requiring 60 in-lb (6.78 Nm) torque. Unit weight is not specified in provided documentation or web sources.

Integration and Positioning

While products like BLUE SEA manual battery switches or ACR load distributors handle isolation or load distribution respectively, the m-LVD serves as a proactive battery protection component. It differs from a simple battery switch by its automation and ability to specifically manage non-essential loads. Compared to more complex solutions featuring multifunction battery managers, the m-LVD provides a targeted and simplified solution for low-voltage disconnection, particularly suited to 12V DC installations requiring reliable protection against deep discharge without the complexity of a full system.

Documentation

Type	Nom
	EN - Instructions - m-LVD Low Voltage Disconnect
	EN - Certificate - m-LVD Low Voltage Disconnect
	EN - Certificate - m-LVD Low Voltage Disconnect

Expert opinion

Pol CONIN

Digital Manager

« Smart 12V DC battery protection: expert review of the m-LVD disconnect »

The BLUE SEA m-LVD low-voltage disconnect is a critical component for the longevity of 12V DC onboard electrical systems. It is specifically designed for boat owners, recreational vehicles, or standalone installations seeking to protect their service battery bank from deep discharges without constant manual intervention. Its primary function is to maintain sufficient energy reserves for engine start by automatically shedding secondary loads before voltage reaches a critical threshold.

Installation is simplified by its multiple mounting options (surface, front or rear panel) and clear documentation. For optimal integration, it should be placed on non-critical charging circuits downstream of the main battery switch. Wiring must comply with recommendations for 6 AWG (16mm²) for nominal currents, though the device physically accepts up to 1/0 AWG (50mm²). An optional audible alarm adds value by providing a pre-alert before actual disconnection.

This m-LVD stands out from traditional battery switches due to its intelligence and automation. Unlike a simple switch, it actively monitors voltage and acts preventively. Its ability to adjust the disconnect voltage (between 11.3V and 12.1V) and the "Override" function via the remote switch offers valuable flexibility to adapt to different battery types and immediate user needs. It is a self-contained and effective solution that does not require integration into a complex NMEA 2000 network, making it particularly relevant for simpler electrical systems or as a complement to existing installations. Its robust design, IP67 certified and compliant with ignition protection standards, ensures reliability in marine environments.

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Low-voltage disconnect m-LVD

£94.09 GBP

£94.09 GBP ~~£102.19 GBP~~

Frequently Asked Questions

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What is BLUE SEA's m-LVD Low Voltage Disconnect?

BLUE SEA's m-LVD (Low Voltage Disconnect) is an automatic low-voltage disconnect device designed for 12V DC systems. Its primary function is to protect batteries from deep discharge by automatically cutting non-essential loads when battery voltage drops below a predefined threshold. This preserves energy needed for engine starting or extends battery lifespan.

What are the main functions of the m-LVD Low Voltage Disconnect?

The main functions of the m-LVD include:

Protection of batteries against deep discharge.Automatic disconnection of non-essential loads in case of low voltage.Automatic reconnection of circuits when battery voltage is restored.A visual indicator of low-voltage status.An alarm output for optional audible warning.Remote control for adjusting disconnection voltage, an "Override" mode, and a manual "OFF" function.

What is the nominal operating voltage of the m-LVD?

The m-LVD Low Voltage Disconnect is designed to operate at a nominal voltage of 12V DC.

What is the DC current capacity of the m-LVD?

The m-LVD can handle a DC current of 65 amperes (A).

What is the intermittent current capacity of the m-LVD?

The m-LVD has an intermittent current capacity of 115 amperes (A) for a maximum duration of 5 minutes.

Is the m-LVD water-resistant or suitable for marine environments?

Yes, the m-LVD is IP67 certified, meaning it is protected against temporary immersion. It also meets the external ignition protection requirements of ISO 8846 and SAE J1171, making it suitable for marine environments.

What are the safety certifications of the m-LVD?

The m-LVD complies with external ignition protection requirements per ISO 8846 and SAE J1171 standards. It is also CE certified under Directive 2013/53/EU for recreational craft and motorized watercraft.

What is the current consumption of the m-LVD?

The m-LVD consumes 95 mA in connected state (normal operation) and only 4 mA in open state (disconnected).

Does the m-LVD have a visual indicator for voltage status?

Yes, the m-LVD is equipped with a status light that provides a visual warning of low voltage before disconnection. This indicator is present on both the m-LVD and the remote control switch.

Can the m-LVD trigger an audible alarm in case of low voltage?

Yes, the m-LVD has an alarm output that can be connected to an optional audible alarm. This alarm triggers 5 minutes after the voltage drops below the disconnect threshold, providing an audible warning before the circuits are effectively cut off.

How to adjust the m-LVD disconnect voltage?

To adjust the disconnect voltage, hold the OVERRIDE position on the remote control switch for 10 seconds. The LED will start flashing to indicate the current setting. Use the OFF position to decrease the voltage in 0.2V increments (down to 11.3V) and the OVERRIDE position to increase it (up to 12.1V). The factory setting is 12.1V. Release the switch and wait approximately 20 seconds for the new setting to be saved.

What are the safety prerequisites before installing the m-LVD?

Before starting any electrical installation, it is imperative to disconnect all AC and DC power sources. If you are not familiar with electrical systems, it is recommended to consult a qualified professional. Never service equipment that has been automatically disconnected by the m-LVD without first removing power permanently by another means than the m-LVD itself.

How to choose the mounting location for the m-LVD and its remote control switch?

The m-LVD can be mounted in three ways: on the rear panel, on the front panel, or surface-mounted. The remote control switch is typically mounted on a panel. Drilling dimensions are provided for mounting the remote switch.

What cable size is recommended to connect the m-LVD?

To match the m-LVD’s current capacity, the minimum recommended cable size is 6 AWG (16mm²). Larger cable sizes may be required to reduce voltage drop over long distances. Consult a certified ABYC electrician for proper cable sizing and fuse selection.

What are the dimensions of the m-LVD connection terminals?

The m-LVD connection terminals are 1/4"-20 (M6) studs.

Is the m-LVD supplied with a remote control switch?

Yes, the m-LVD is supplied with the PN 7928 remote control switch. This switch allows you to adjust the disconnect voltage, activate the "Override" mode, or manually cut circuits using the "OFF" function.

Do we need to use fuses with the m-LVD? And if so, what size?

Yes, using fuses is essential for circuit protection. The fuse size depends on the maximum current of the protected circuit:

For ≤30A: 40A-50A fuse with #10 AWG (6mm²) cableFor ≤50A: 60A-65A fuse with #8 AWG (10mm²) cableFor ≤65A: 90A-100A fuse with #6 AWG (16mm²) cableIt is advised to consult a certified ABYC electrician for correct fuse placement and sizing.

Is the m-LVD compatible with systems other than 12V DC?

No, the m-LVD is specifically designed for electrical systems with a nominal voltage of 12V DC. It is not compatible with systems of different voltage (for example, 24V DC or AC).