---
product_id: 19698571
title: "Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine"
brand: "keyline chargers"
price: "€ 177.58"
currency: EUR
in_stock: true
reviews_count: 13
category: "Key Line Chargers"
url: https://www.desertcart.it/products/19698571-dual-battery-isolator-kit-12v-140-amp-voltage-sensitive-relay
store_origin: IT
region: Italy
---

# 140A max current capacity Automatic voltage-sensitive relay (VSR) IP65-rated rugged durability Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine

**Brand:** keyline chargers
**Price:** € 177.58
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your adventures with smart, seamless dual battery control!

## Quick Answers

- **What is this?** Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine by keyline chargers
- **How much does it cost?** € 177.58 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/19698571-dual-battery-isolator-kit-12v-140-amp-voltage-sensitive-relay)

## Best For

- keyline chargers enthusiasts

## Why This Product

- Trusted keyline chargers brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Complete DIY Kit:** Includes all cables, terminals, and installation guides for a hassle-free plug-and-play setup.
- • **Rugged & Weatherproof:** IP65-rated solid-state design built to withstand dust, water, vibration, and extreme conditions.
- • **Smart Voltage Activation:** Engages at 13.3V and disconnects at 12.8V to protect your starting battery from drain.
- • **Seamless Power Management:** Automatically balances charge between dual batteries without voltage drop or power loss.
- • **Confidence-Backed Warranty:** 12-month industry-leading warranty plus a 30-day money-back guarantee for risk-free power.

## Overview

The Dual Battery Isolator Kit 12V by KeyLine Chargers features a 140A voltage sensitive relay that automatically manages power distribution between two batteries, preventing drain and ensuring optimal charging. Compact and IP65-rated, it’s engineered for rugged automotive, marine, and off-road use. The kit includes all necessary cables and terminals for easy DIY installation, backed by a 12-month warranty and 30-day money-back guarantee.

## Description

Buy Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine: Battery Relocation Kits - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Very easy to install - It works perfect I just put it on a big truck to have a backup battery for a power inverter that is installed for power tools and it works perfectly easy to install the quality looks pretty good includes everything you need and your battery terminals you may have to fill the hole biggers on the tips but other than that everything fits good
Review: Quality product on my 2014 800 Polaris. - Worked perfectly.

## Features

- Advanced Dual Battery Isolator 12V Kit – Designed for superior performance, this dual battery kit ensures efficient power distribution between two batteries without voltage drops. Unlike traditional battery isolator diodes, this automatic disconnect switch eliminates power loss while maintaining a seamless connection between your primary and auxiliary power sources. Compact at 2.6” x 2.6” x 2”, it’s perfect for under-hood installations or as part of a battery relocation kit.
- Smart Voltage Sensitive Relay (VSR) for Optimal Charging – Featuring a 12V dual battery wiring kit, this system automatically activates at 13.3V and disengages at 12.8V, ensuring your starting battery remains fully charged. Whether you're installing a marine dual battery kit for your boat, a dual battery kit for truck applications, or need a battery isolator 12V kit for off-grid power, this setup prevents battery drain and guarantees reliable performance.
- Built for Extreme Conditions & Rugged Durability – Engineered for off-road adventures, marine use, and daily driving, this dual battery isolator kit is IP65-rated for water, dust, and vibration resistance. Its solid-state design ensures durability, making it an excellent choice for automotive, RV, UTV, and marine battery isolator needs. Whether battling tough trails or navigating open waters, count on this dual battery wiring kit to provide uninterrupted power.
- Complete Dual Battery Wiring Kit for Easy DIY Installation – No complicated setup required! This battery isolator kit includes a 140A voltage sensitive relay, 12" red power cable, 24” red power cable, 12" black ground cable, tinned copper lugs, marine-grade brass terminals, heat shrink tubing, cable ties, and an easy-to-follow install guide. No complex wiring or diodes required—this is a plug-and-play solution for any 12V dual battery wiring setup.
- Trusted Performance with Warranty & Money-Back Guarantee – Every dual battery kit by KeyLine Chargers is backed by a 12-month industry-leading warranty. If you’re not 100% satisfied with your purchase, take advantage of our 30-day money-back guarantee—no questions asked! Drive with confidence knowing you have a premium battery isolator 12V kit keeping your power system running at full capacity.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00WTAFR52 |
| Best Sellers Rank | #17,933 in Automotive ( See Top 100 in Automotive ) #3 in Automotive Replacement Battery Relocation Kits #596 in Automotive Replacement Electrical System Relays |
| Date First Available | April 28, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8 ounces |
| Item model number | Iso-Pro140 |
| Manufacturer | KeyLine Chargers |
| Product Dimensions | 1.97 x 1.97 x 1.97 inches |

## Images

![Dual Battery Isolator Kit 12V - 140 Amp Voltage Sensitive Relay (VSR) for Dual Battery Setup - Automatic Disconnect Switch for Car, Truck, RV, UTV, ATV, Marine - Image 1](https://m.media-amazon.com/images/I/61MYMB46z7L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very easy to install
*by T***G on April 6, 2025*

It works perfect I just put it on a big truck to have a backup battery for a power inverter that is installed for power tools and it works perfectly easy to install the quality looks pretty good includes everything you need and your battery terminals you may have to fill the hole biggers on the tips but other than that everything fits good

### ⭐⭐⭐⭐⭐ Quality product on my 2014 800 Polaris.
*by J***E on September 28, 2025*

Worked perfectly.

### ⭐⭐⭐⭐⭐ Solid switch for a dual battery boat
*by M***. on June 20, 2025*

Why did you pick this product vs others?: Easy to install for my boat. I wanted something to isolate my starting battery from my battery that mainly runs my radio, so we can start the boat after floating and listening to the radio. I originally had an A/B/Both manual switch, that was hard to access. Now I can have enough left in one battery to get it started and not worry about flipping a switch or remembering to parallel them to charge them back up. The only thing about the install I didn’t like was having to trim out the side of the switch for the cables to route through. My boat alternator is rated for 65 amps, so this should handle that load without a problem.

## Frequently Bought Together

- Dual Battery Isolator Kit 12v 140 Amp - ATV/UTV Wiring Kit - Voltage Sensitive Relay - VSR - Boat Dual Battery Smart Isolator 12v Kit, Automatic Battery Disconnect Switch 12V by KeyLine Chargers
- T Tocas 100A Amp Circuit Breaker for Boat Trolling Motor Marine ATV Vehicles Stereo Audio Battery Solar System with Manual Reset Switcher 100 amp Waterproof DC 12V-48V (100A)
- SHURIKEN SK-BT35 12-Volt High Performance AGM Power Cell Battery for Systems Up to 800-Watts

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.it/products/19698571-dual-battery-isolator-kit-12v-140-amp-voltage-sensitive-relay](https://www.desertcart.it/products/19698571-dual-battery-isolator-kit-12v-140-amp-voltage-sensitive-relay)

---

*Product available on Desertcart Italy*
*Store origin: IT*
*Last updated: 2026-03-07*