---
product_id: 472224145
title: "12V 140A Split Charge Relay,VSR Dual Battery Isolator"
brand: "heart horse"
price: "$57.09"
currency: USD
in_stock: true
reviews_count: 13
category: "Heart Horse"
url: https://www.desertcart.us/products/472224145-12v-140a-split-charge-relay-vsr-dual-battery-isolator
store_origin: US
region: United States of America
---

# Real-time LED voltage display 140A high-current capacity Auto/manual dual control modes 12V 140A Split Charge Relay,VSR Dual Battery Isolator

**Brand:** heart horse
**Price:** $57.09
**Availability:** ✅ In Stock

## Summary

> ⚡ Stay charged, stay ahead — power your adventures with smart dual-battery control!

## Quick Answers

- **What is this?** 12V 140A Split Charge Relay,VSR Dual Battery Isolator by heart horse
- **How much does it cost?** $57.09 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/472224145-12v-140a-split-charge-relay-vsr-dual-battery-isolator)

## Best For

- heart horse enthusiasts

## Why This Product

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

## Key Features

- • **Powerful 140A Capacity:** Handles heavy-duty dual battery charging with ease, perfect for demanding campervan and marine setups.
- • **Rugged IP68 Protection:** Durable, waterproof housing built to withstand harsh vehicle and marine environments.
- • **Instant Voltage Insight:** Built-in LED display lets you monitor battery health at a glance—no extra tools needed.
- • **Smart Auto & Manual Modes:** Switch seamlessly between automatic voltage-sensitive charging and manual override for full control.
- • **Precision Voltage Switching:** Automatically connects at 13.3V and disconnects at 12.8V to protect your starter battery from drain.

## Overview

The Heart Horse 12V 140A Split Charge Relay is a robust voltage sensitive relay designed for dual battery systems in campervans, boats, and 4x4s. Featuring a real-time LED voltage display, automatic/manual operation modes, and precise 13.3V cut-in/12.8V cut-out thresholds, it ensures efficient charging of auxiliary batteries without draining the starter battery. Its IP68-rated housing guarantees durability in tough environments, making it an essential upgrade for reliable off-grid power management.

## Description

Heart Horse 12V 140A Split Charge Relay,VSR Dual Battery Isolator | 12V 140A VSR with LED voltage display, auto/manual modes and 13.3V cut-in/12.8V cut-out for campervans, boats and RVs. : desertcart.co.uk: Automotive

Review: Can recommend - Works perfect.
Review: See the result - Ray fit, great product . Love the voltage display and so do customers.

## Features

- SMART 12V DUAL-BATTERY CHARGING – The 140A voltage sensitive relay connects your starter and auxiliary batteries when charging voltage rises and isolates them when voltage falls, helping charge a second battery without unnecessarily draining the starter battery.
- REAL-TIME LED VOLTAGE DISPLAY – Check system voltage at a glance without connecting a separate voltmeter. The built-in digital display makes it easier to monitor battery voltage during installation, charging and everyday use.
- AUTO & MANUAL CONTROL MODES – Use voltage-sensitive automatic operation for everyday charging, or switch to manual control when you need direct control of the relay connection. Clear indicators make the operating status easy to check.
- 13.3V CUT-IN & 12.8V CUT-OUT – The VSR automatically connects at approximately 13.3V and disconnects at approximately 12.8V to separate the auxiliary battery when charging voltage is no longer available. IP68 housing helps protect the relay in demanding vehicle and marine installations.
- CHECK YOUR CHARGING SYSTEM BEFORE BUYING – Designed for compatible conventional 12V alternator dual-battery systems in campervans, motorhomes, 4x4s, trucks and boats. Check your alternator type, battery chemistry, cable size and fuse requirements before installation.（Ternary lithium batteries cannot be used.）

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0B9GMP4SZ |
| Best Sellers Rank | 3,288 in Automotive ( See Top 100 in Automotive ) 8 in Car Relays |
| Brand | Heart Horse |
| Coil Voltage | 12 Volts |
| Contact Current Rating | 140 Amps |
| Contact Material | Copper |
| Contact Type | Normally Open |
| Contact material | Copper |
| Contact type | Normally Open |
| Country Of Origin | China |
| Current Rating | 140 Amps |
| Current rating | 140 Amps |
| Customer Reviews | 4.4 out of 5 stars 321 Reviews |
| Item Highlight | 12V 140A VSR with LED voltage display, auto/manual modes and 13.3V cut-in/12.8V cut-out for campervans, boats and RVs. |
| Manufacturer | TripleWaterTripleGood |
| Manufacturer Part Number | sku3426-yy |
| Minimum Switching Voltage | 12.8 Volts (DC) |
| Model Number | sku3426-yy |
| Mounting Type | Screw Mount |
| Mounting type | Screw Mount |
| Operation Mode | Automatic |
| Operation mode | Automatic |
| Specification Met | ip68 |
| Wattage | 1680 watts |

## Product Details

- **Brand:** Heart Horse
- **Contact material:** Copper
- **Contact type:** Normally Open
- **Current rating:** 140 Amps
- **Mounting type:** Screw Mount

## Images

![12V 140A Split Charge Relay,VSR Dual Battery Isolator - Image 1](https://m.media-amazon.com/images/I/61gf8Y00VFL.jpg)
![12V 140A Split Charge Relay,VSR Dual Battery Isolator - Image 2](https://m.media-amazon.com/images/I/71S9tAy+HwL.jpg)
![12V 140A Split Charge Relay,VSR Dual Battery Isolator - Image 3](https://m.media-amazon.com/images/I/71uCzXxBMiL.jpg)
![12V 140A Split Charge Relay,VSR Dual Battery Isolator - Image 4](https://m.media-amazon.com/images/I/71Q9trvNFrL.jpg)
![12V 140A Split Charge Relay,VSR Dual Battery Isolator - Image 5](https://m.media-amazon.com/images/I/71NrniU6qWL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Can recommend
*by S***R on 9 December 2025*

Works perfect.

### ⭐⭐⭐⭐⭐ See the result
*by A***R on 13 February 2026*

Ray fit, great product . Love the voltage display and so do customers.

### ⭐⭐⭐⭐ Very good item a must have on a camoervan
*by R***D on 18 August 2026*

Easy to fit the only I did not like was you have to press the button all the time to read the voltage apart from that it’s a good item I e had many problems with my camper van this for the price has solved the issue

## Frequently Bought Together

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-09-20*