---
product_id: 5059125
title: "Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts"
brand: "jaycorp"
price: "₨2649"
currency: SCR
in_stock: true
reviews_count: 8
category: "Jay Corp"
url: https://www.desertcart.sc/products/5059125-smart-dual-battery-140a-isolator-auto-boat-rv-model-vsr12
store_origin: SC
region: Seychelles
---

# Cut-In: 13.4V 140A Power Rating Water & Dust Resistant Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts

**Brand:** jaycorp
**Price:** ₨2649
**Availability:** ✅ In Stock

## Summary

> 🔌 Power Up Your Adventures with Confidence!

## Quick Answers

- **What is this?** Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts by jaycorp
- **How much does it cost?** ₨2649 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sc](https://www.desertcart.sc/products/5059125-smart-dual-battery-140a-isolator-auto-boat-rv-model-vsr12)

## Best For

- jaycorp enthusiasts

## Why This Product

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

## Key Features

- • **Durable & Reliable:** Built to withstand the elements, ensuring longevity in any environment.
- • **Automatic Operation:** Smart technology that automatically manages your battery connections.
- • **Seamless Power Management:** Experience uninterrupted power flow with zero voltage drop.
- • **Compact & Versatile Design:** Fits anywhere with dimensions of just 2.68" x 2.68" x 1.93".
- • **User-Friendly Installation:** No complex wiring needed; includes mounting screws and detailed instructions.

## Overview

The Smart Dual Battery 140A Isolator (Model: VSR12) is a cutting-edge solution for managing battery connections in vehicles, boats, and RVs. With a compact design, automatic operation, and no voltage drop, it ensures reliable power management while being easy to install and resistant to water and dust.

## Description

Buy Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts: Battery Chargers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Not cheap because it's not cheap. - I am using this in a Ford e350 van, converted to a camper, to maintain the truck battery under the hood and maintain 2 deep cell marine batteries in the back, which i run a fridge/micro, etc. with using a 1500 watt inverter. I was told by many old school camper guys this setup wouldn't work, but it works great! The VSR is small and lightweight, and simple to hookup and use. It has one simple LED light letting you know where it's sending voltage. Proper gauge wire is imperative, i have 6 gauge run to all batteries, with a 150 amp ANL fuse, and have had no trouble at all with this unit. I returned a much larger, heat synced Northern tool unit after i saw the difference in size. This one is great under the hood of a van or any tight space. Word of note: I did have to trim some of the plastic away where my wires run in and out of the unit. It's 2 pieces and you have to trim away part of the cover if you're using proper gauge wire to get it to sit on the base correctly. This will make sense when you see the unit in person, and it's pretty obvious the manufacturer intended for you to cut or drill depending on your application.
Review: Save your towing vehicle's battery - This is not your father's isolator. This is a smart device which senses both batteries and if either one is receiving a charge, it will enable charging of both. Most importantly if you park your tow vehicle and shut down the motor so it is no longer providing current to charge both batteries, it will isolate them and protect your starting battery. Without the isolation, devices in your boat/camper can discharge both batteries and you will be unable to start in the morning when you are ready to get the day going. I have had this happen to me. This is not just an old fashioned isolator which uses diodes and actually reduces the amount of current available to charge the batteries. That is why those older style isolators have such a large heat sink (the finned aluminum base) to dissipate the wasted energy. Notice that this isolator does not have, and does not require, a heat sink because it uses a relay that it closes or opens and has no energy loss due to internal resistance. So yes, it is a little more costly than the older "diode" isolators, but it will do a much better job protecting your batteries!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00400IYTK |
| Best Sellers Rank | #717,327 in Automotive ( See Top 100 in Automotive ) #1,519 in Battery Chargers |
| Brand | JayCorp |
| Brand Name | JayCorp |
| Coil Voltage | 12 volts |
| Connector Type | Wired |
| Contact Current Rating | 140 A |
| Contact Material | Silver Copper |
| Contact Type | Normally Open |
| Current Rating | 140 A |
| Customer Reviews | 4.6 out of 5 stars 253 Reviews |
| Manufacturer | True Amalgamated |
| Minimum Switching Voltage | 13.4 volts |
| Model | VSR12 |
| Mounting Type | Surface Mount |
| Operation Mode | Automatic |
| Part Number | VSR12 |
| Specification Met | Iatf16949-2016 |
| Unit Count | 1 Count |

## Product Details

- **Connector Type:** Wired
- **Contact Material:** Silver Copper
- **Contact Type:** Normally Open
- **Current Rating:** 140 A
- **Mounting Type:** Surface Mount

## Images

![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 1](https://m.media-amazon.com/images/I/71uxDXnTRpL.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 2](https://m.media-amazon.com/images/I/71KIzy1e78L.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 3](https://m.media-amazon.com/images/I/71j8McmGJsL.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 4](https://m.media-amazon.com/images/I/416jN8TFaQL.jpg)
![Smart Dual Battery 140A Isolator - Auto/Boat/RV, Model: VSR12, Car & Vehicle Accessories / Parts - Image 5](https://m.media-amazon.com/images/I/81hX7Hqjs2L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Not cheap because it's not cheap.
*by E***E on January 21, 2012*

I am using this in a Ford e350 van, converted to a camper, to maintain the truck battery under the hood and maintain 2 deep cell marine batteries in the back, which i run a fridge/micro, etc. with using a 1500 watt inverter. I was told by many old school camper guys this setup wouldn't work, but it works great! The VSR is small and lightweight, and simple to hookup and use. It has one simple LED light letting you know where it's sending voltage. Proper gauge wire is imperative, i have 6 gauge run to all batteries, with a 150 amp ANL fuse, and have had no trouble at all with this unit. I returned a much larger, heat synced Northern tool unit after i saw the difference in size. This one is great under the hood of a van or any tight space. Word of note: I did have to trim some of the plastic away where my wires run in and out of the unit. It's 2 pieces and you have to trim away part of the cover if you're using proper gauge wire to get it to sit on the base correctly. This will make sense when you see the unit in person, and it's pretty obvious the manufacturer intended for you to cut or drill depending on your application.

### ⭐⭐⭐⭐⭐ Save your towing vehicle's battery
*by C***L on October 17, 2013*

This is not your father's isolator. This is a smart device which senses both batteries and if either one is receiving a charge, it will enable charging of both. Most importantly if you park your tow vehicle and shut down the motor so it is no longer providing current to charge both batteries, it will isolate them and protect your starting battery. Without the isolation, devices in your boat/camper can discharge both batteries and you will be unable to start in the morning when you are ready to get the day going. I have had this happen to me. This is not just an old fashioned isolator which uses diodes and actually reduces the amount of current available to charge the batteries. That is why those older style isolators have such a large heat sink (the finned aluminum base) to dissipate the wasted energy. Notice that this isolator does not have, and does not require, a heat sink because it uses a relay that it closes or opens and has no energy loss due to internal resistance. So yes, it is a little more costly than the older "diode" isolators, but it will do a much better job protecting your batteries!

### ⭐⭐⭐⭐⭐ Excellent VSR Isolator
*by M***C on August 26, 2011*

I purchased this VSR to isolate a battery in my truck camper. It is a little more expensive than a conventional battery isolator but it is smaller and easier to connect. I have tested it with my volt meter and thus far it has worked perfectly. It turns on at 13.3 volts (which protects your aux battery from being used as a starting battery by switching on only once the staring battery is fully charged). And cuts out at 12.8 volts (which keeps you from draining your starting battery when using your aux battery without the engine running). A nice feature is a little LED light that indicates when it's engaged. Also, it's rated for 140 amps, which is well over my electrical needs. There is an option to buy this same VSR with a kit, but I opted not to buy the kit because I needed higher gauge wire, and I could get it at a lower overall cost. Because of the thicker wire, I had to modify the wire inlets a little, but it was easy. I would recommend this product to anyone looking to isolate a battery.

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*Product available on Desertcart Seychelles*
*Store origin: SC*
*Last updated: 2026-10-01*