---
product_id: 322654187
title: "Dual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black"
brand: "keyline chargers"
price: "€ 110.22"
currency: EUR
in_stock: true
url: https://www.desertcart.fi/products/322654187-dual-battery-isolator-12v-automatic-battery-disconnect-switch-12v-140
store_origin: FI
region: Finland
---

# 140A Power Dual Battery IP65 Rated Dual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black

**Brand:** keyline chargers
**Price:** € 110.22
**Availability:** ✅ In Stock

## Summary

> 🔌 Power Up Your Adventure with KeyLine!

## Quick Answers

- **What is this?** Dual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black by keyline chargers
- **How much does it cost?** € 110.22 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/322654187-dual-battery-isolator-12v-automatic-battery-disconnect-switch-12v-140)

## 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

- • **Compact Design:** Fits seamlessly under the hood or in tight spaces.
- • **Rugged & Reliable:** Built to withstand extreme conditions—dust, water, and vibration.
- • **Zero Voltage Drop:** Experience uninterrupted power with zero sacrifice!
- • **Confidence Guaranteed:** 12-month warranty and 30-day money-back promise!
- • **Smart Voltage Sensitivity:** Automatically manages battery health for peak performance.

## Overview

The KeyLine Chargers Dual Battery Isolator is a cutting-edge 12V automatic battery disconnect switch designed for optimal performance. With a robust 140 Amp capacity and a compact size, it ensures your primary battery remains charged while providing rugged durability for off-road and extreme weather conditions. Backed by a 12-month warranty and a 30-day money-back guarantee, this isolator is perfect for vehicles, ATVs, boats, and RVs.

## Description

KeyLine Chargers Dual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black

## Features

- ZERO VOLTAGE DROP: Forget the traditional diode relays and so-called "solid state" devices that can rob you of almost 2 amps of output power! The Keyline Dual Battery Isolator is the only unit designed with cutting edge programming to deliver optimum performance - with ZERO sacrifice. This compact battery isolator was built ultra-small (2.6" x 2.6" x 2") to fit almost anywhere! A perfect fit under the hood to get close to your dual batteries.
- VOLTAGE SENSITIVE RELAY: The KeyLine Automatic 140 Amp Dual Battery Isolator is all you need to charge Two Battery Systems. Voltage Sensitive Relay (VSR) cuts in at 13.3 volts and cuts out at 12.8 volts to ensure your primary battery is always charged and ready to start your vehicle. It's like having two separate power sources for each battery while only having one alternator!
- RUGGED DURABILITY: Unlike other isolators on the market, the KeyLine Automatic 140 Amp Dual Battery Isolator is IP65 Certified. This International Protection rating means that your KeyLine isolator is safe for use even for your off-road needs in dusty, wet and unexpected extreme weather environments. Great for extreme vibration applications as well.
- EASY-TO-USE: The 140 Amp Dual Battery Smart Isolator comes with mounting plate and hardware. Does not include installation wires. Easy-to-follow directions for the most novice DIYer. What could be easier? **If you need installation wiring, see Dual Battery Kit or ATV/UTV Kit.
- BUY WITH CONFIDENCE: Every 140 Amp Dual Battery Isolator is backed by an industry leading 12-month warranty. If you are not 100% satisfied with your purchase, simply take advantage of the No Questions Asked, 30-Day Money Back Guarantee!!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | KeyLine Chargers |
| Brand | KeyLine Chargers |
| Model | ISO-Variation |
| Product Dimensions | 5 x 5 x 5 cm; 272 Grams |
| Item model number | ISO-Variation |
| Exterior | PVC Matte Black |
| Manufacturer Part Number | Iso-Pro140 |
| Item Weight | 272 g |

## Images

![Dual Battery Isolator 12V | Automatic Battery Disconnect Switch 12V 140 Amp Voltage Sensitive Relay (VSR) | Car Battery Switch Also for ATV, Boats, RV's, Off-Road Vehicles,, Black - Image 1](https://m.media-amazon.com/images/I/718YwOW-isL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What gauge is the supplied wires?**
A: The kit comes with 7 AWG wire, but wanted to comment on the customer who stated that it is not enough for a 20 foot run.  At 140 amps, you would need 1/0 AWG wire, but with 95% of the applications out there, the most current that is drawn is around 30-50 amps and that is why we designed the kit with 7 AWG for the 20 foot run.  I hope that helps clarify.

**Q: Will the alternator charge battery 2 with this while car is running**
A: Yes it will. That is precisely one of the features it is designed to do.  Thanks

**Q: I have a 2020 wrangler with a 240 amp alternator. is this rated to work with my alternator? i will be adding a second battery for low-draw accessories**
A: Hello, a 240 amp alternator is definitely a big alternator, however, it is rare that an application would draw more than 40-60 amps at any one time.  It is not so much the alternator size that would cause a problem for our isolator it is the draw from the accessories.  I would recommend adding up the amperage draw from your accessories when they would all be on and determine the draw, if it is under 140amps then it will work well. If you decide to go ahead and use our Keyline Battery Isolator then you may want to install a large 140 amp fuse or breaker to ensure your alternator won't fry the isolator, but again that would be a rare accessory draw application like an induction cooktop or something similar that would draw over 100amps. Remember that the alternator is only going to push enough amps to power the draw of the accessories and to charge the battery (which also has a low amperage draw).  Hope that helps.  Thanks for the question.

**Q: can this be use to charge a lithium batteries on the second battery?**
A: Short answer: it depends.

Longer answer:  it depends on the Li bank  capacity, battery charging specs, alternator specs, resistance of the entire circuit, etc.  

In my case I replaced 220Ah of flooded lead-acid with 100Ah of LiFePO4 and demand on the alternator actually /decreased/ a bit.   If the isolator is already installed you could test it briefly to see what voltage/current from the alternator is like.  If you do not already have the isolator a DC-DC sized to your alternator's rating would be a safer bet.

## Frequently Bought Together

- 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
- TKDMR 10pcs 1/0 AWG-3/8 Battery Lugs,Heavy Duty Wire Lugs,Ring Terminals,Battery Cable Ends,0 Guage terminals,Battery Terminal Connectors with 10pcs 3:1 Heat Shrink Tubing
- 10pcs 4 Awg - 3/8" (M10) Sanuke Wire Lugs Ring Terminal Connectors Ends, UL Listed Heavy Duty for Battery Cable Lug Wire Electrical Eyelets with 3:1 Dual Wall Adhesive Heat Shrink

---

## 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.fi/products/322654187-dual-battery-isolator-12v-automatic-battery-disconnect-switch-12v-140](https://www.desertcart.fi/products/322654187-dual-battery-isolator-12v-automatic-battery-disconnect-switch-12v-140)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-22*