VSR 12V 140Amp Dual Battery Smart Isolator

Keep your dual battery system charged, protected and ready for action with the 12V 140A Voltage Sensitive Relay (VSR) Dual Battery Smart Isolator.

Designed for boats, 4WDs, caravans, camper trailers, RVs and trucks, this smart battery isolator automatically manages charging between two batteries, helping maintain battery performance while protecting your starting battery from excessive discharge.

Featuring dual voltage sensing technology, the VSR monitors both batteries and automatically connects or disconnects them according to voltage levels. When charging voltage reaches 13.3V, the relay connects the batteries to share charging power. When voltage drops to approximately 12.8V, it disconnects them to help preserve starting power.

The integrated digital voltmeter and LED indicator allow easy monitoring, while automatic and manual operating modes provide flexibility for different applications.

Built with an IP67-rated waterproof, dustproof and oil-resistant enclosure, this durable isolator is ideal for demanding marine and off-road environments.

Features

12V Dual Battery Management: Automatically controls charging between starter and auxiliary batteries.

Dual Voltage Sensing: Monitors both batteries to help distribute available charging power.

Automatic Connection: Connects batteries when charging voltage reaches 13.3V.

Automatic Disconnection: Separates batteries when voltage falls to approximately 12.8V.

Battery Protection: Automatically disconnects below 11V or above 17V.

Auto & Manual Modes: Convenient push-button operation for flexible battery management.

Digital Voltage Display: Built-in voltmeter displays battery voltage for easy monitoring.

LED Status Indicator: Quickly identifies relay connection status.

Storage Mode: Optional low-power storage function to minimise battery drain.

IP67 Waterproof Protection: Silicone-sealed enclosure resists water, dust and oil.

Heavy-Duty Design: Suitable for marine, recreational and automotive dual battery applications.

Specifications

Ideal Applications

Boats and marine dual battery systems

4WDs and off-road vehicles

Caravans and camper trailers

RVs and motorhomes

Trucks and utility vehicles

Auxiliary battery charging systems

A practical solution for managing your dual battery setup, helping keep your accessories powered and your starting battery ready when you need it.