Voltage-sensitive relay kit 12V 140A – Dual battery isolator IP65 – Model 6 m

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The voltage-sensitive relay kit 12V 140A – model 6 m is the most suitable version for dual battery installations requiring a long cable run. It is particularly suitable for large motorhomes, converted trucks, long vans, boats, technical cells, or vehicles equipped with an auxiliary battery placed far from the main battery.

Thanks to its automatic relay, the system connects the engine battery and the auxiliary battery when the charging voltage is sufficient, then separates them when the voltage drops. The goal is to allow the use of a service battery for your 12V accessories while preserving the starter battery.

Highlights of the 6 m model

• 6 m battery cable: ideal for long wiring distances.
• Automatic relay 12V 140A: autonomous battery coupling management.
• Low voltage separation: helps protect the main battery.
• IP65 housing: protection against dust and water splashes.
• Compact format: relay easy to integrate into a technical compartment.
• Included accessories: cables, terminals, fuse holder, lugs, and screws.
• 2-year warranty.

This dual battery isolator kit allows powering a 12V auxiliary installation from a secondary battery while keeping the main battery dedicated to vehicle starting. It is designed for configurations where the distance between the two batteries is greater than in the 2 m, 4 m, or 5 m versions.

The 6 m version offers a comfortable length to route the cable through a large vehicle, along a chassis, to reach a rear compartment, connect to a camper cell, or cross a technical area on a boat. It avoids unnecessary intermediate connections and facilitates a cleaner installation when the auxiliary battery is truly distant.

The relay automatically monitors the circuit voltage. It activates when the voltage reaches about 13.3V, then deactivates when the voltage drops around 12.8V. This automatic management allows the batteries to be separated when the engine is off or when the voltage is no longer sufficient.

Recommended applications

• Large camper with service battery in the hold.
• Long van or converted truck.
• Utility vehicle equipped with 12V accessories at the rear.
• Boat, yacht, or marine installation with a distant auxiliary battery.
• 4x4, pickup, ATV, UTV, and recreational vehicle.
• Removable cell or setup with a separate technical compartment.
• Dual battery installation requiring a significant cable length.

Automatic operation

• The relay detects the 12V system voltage.
• It couples the batteries when the voltage reaches about 13.3V.
• It separates the batteries when the voltage drops around 12.8V.
• The disengagement delay is about 5 to 10 seconds.
• The auxiliary battery can power accessories without directly draining the engine battery.

Technical specifications

• Model: JDQTJ-6M
• Version: 6 m model
• Product type: voltage-sensitive relay / dual battery isolator
• Nominal voltage: 12V DC
• Continuous current: 140A
• Intermittent current: 160A
• Activation voltage: 13.3V
• Cut-off voltage: 12.8V
• Protection rating: IP65
• Housing material: nylon plastic
• Operating consumption: 280 mA
• Standby consumption: 8 mA
• Power studs: stainless steel M6
• Activation delay time: 5 seconds
• Disengagement delay: approximately 5 to 10 seconds
• Operating temperature: -30°C to +105°C
• Relay dimensions: 6.76 x 5.36 x 6.76 cm
• Net kit weight: approximately 1.88 kg
• Warranty: 2 years

Box contents

• 1 separate 12V charge relay
• 1 red 110A battery cable of 6 m
• 1 black ground cable 110A of 1 m
• 1 positive marine battery terminal
• 1 negative marine battery terminal
• 2 fuse holders
• 3 lug connectors
• 3 insulated blue ring terminals
• 15 cable ties
• 2 red cables 110A of 250 mm
• 2 heat shrink tubes
• 1 drill bit
• 1 black split conduit
• 1 set of screws

Why choose the 6 m version?

The 6 m model is recommended when the auxiliary battery is installed far from the engine battery. It is the most comfortable version for large vehicles or setups where the cable needs to bypass compartments, run along a wall, pass under flooring, or reach a technical hold.

It is more suitable than shorter versions when the actual cable path exceeds a simple proximity connection. Before purchase, it is advisable to measure the complete cable route, taking into account passages, curves, protections, and fixation areas.

Installation tips

For reliable installation, the 6 m cable must be properly guided and protected along its entire length. Avoid routes near a heat source, friction areas, moving parts, and metal edges.

Important recommendations:

• ensure that the vehicle or installation is indeed 12V DC;
• respect the polarity of the main battery and the auxiliary battery;
• install the fuse holders according to the wiring diagram;
• securely fix the relay in a stable and accessible area;
• hold the cable with the provided ties;
• add a sheath protection if the cable crosses an exposed area;
• have the assembly checked by a professional if in doubt.

This product is an automatic coupling-separating relay. It does not replace a DC/DC charger if your auxiliary battery requires regulated charging with a specific curve, especially on certain lithium batteries.

This model is intended only for 12V DC installations. It must not be used on a 24V or 48V system.

2-year warranty

VEV / 15864