---
product_id: 123043634
title: "MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST"
brand: "mayspare"
price: "₩58793"
currency: KRW
in_stock: true
reviews_count: 13
category: "May Spare"
url: https://www.desertcart.kr/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter
store_origin: KR
region: South Korea
---

# 500A surge max current 80A continuous duty rating 100,000 mechanical cycles durability MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST

**Brand:** mayspare
**Price:** ₩58793
**Availability:** ✅ In Stock

## Summary

> 🔋 Stay Powered, Stay Ahead — Never Miss a Beat with MaySpare's 500 AMP Battery Isolator!

## Quick Answers

- **What is this?** MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST by mayspare
- **How much does it cost?** ₩58793 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter)

## Best For

- mayspare enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** Engineered for 100,000 mechanical cycles ensuring long-term, maintenance-free operation.
- • **Power Through Peaks:** Handles up to 500A surge current for ultimate battery protection and performance.
- • **Reliable Continuous Duty:** Rated for 80A continuous current to keep your dual-battery system running smoothly all day.
- • **Complete Installation Kit:** Includes heavy-duty 100A terminals and insulated caps for a hassle-free, professional setup.
- • **Premium Contact Materials:** Copper contacts with silver pins deliver superior conductivity and corrosion resistance.

## Overview

The MaySpare 500 AMP Battery Isolator Relay is a robust 12V DC solenoid designed for dual-battery systems, offering 80A continuous and 500A surge current capacity. Featuring copper-silver contacts and a 100,000-cycle mechanical lifespan, it ensures reliable, long-lasting performance. The package includes all necessary terminals and insulated caps for easy installation, making it an essential upgrade for professional-grade automotive and power setups.

## Description

Buy MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST: Solenoids - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: good value for the money - works as described
Review: Works great - Works great

## Features

- Double Batteries Isolator Control On/Off Switch; Continuous Amps: 80,Surge Max Amps:500 ,Voltage: 12VDC; 100,000 mechanical cycle life./Normally Open With Attaching Hardware, Copper Contact With Sliver Pins
- Max Switching Currecnt could pass 500A at 5ms ,and Max Switching power could be 2000W / Replace: White Rodgers: 120-105751, 120-105751-6, 120-901S1,120-107112/ Cummins 3916301 3916302
- Note: It requires constant voltage as but depending on the application. The working time could be around continuous four or five hours , stop it and then use it.
- Install:The kit has included 4pcs big 100AMP terminals connected to loading and 4pcs small terminals which connected to original power. 4pcs insulated skin red cap.
- high current relays are the most reliable and efficient way to add secondary batteries to your system; Provide better service, please contact us if you have any questions!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07MV4WJ7K |
| Best Sellers Rank | #39,286 in Automotive ( See Top 100 in Automotive ) #10 in Automotive Replacement Starter Solenoids |
| Brand | MaySpare |
| Coil Resistance | 18 Ohms |
| Coil Voltage | 12 Volts |
| Connector Type | Screw |
| Contact Current Rating | 80 Amps |
| Contact Material | Copper Silver |
| Contact Type | Normally Open |
| Current Rating | 80 Amps |
| Date First Available | January 15, 2019 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8.1 ounces |
| Item model number | US-4t500A |
| Manufacturer | May Spare Parts |
| Maximum Switching Current | 1 Amps |
| Minimum Switching Voltage | 13 Volts (DC) |
| Mounting Type | Screw Mount |
| Operation Mode | Continuous Duty |
| Package Dimensions | 3.62 x 3.11 x 2.99 inches |
| Specification Met | OEM |
| UPC | 754111153130 |
| Upper Temperature Rating | 80 Degrees Celsius |
| Wattage | 2000 watts |

## Product Details

- **Connector Type:** Screw
- **Contact Material:** Copper Silver
- **Contact Type:** Normally Open
- **Current Rating:** 80 Amps
- **Mounting Type:** Screw Mount

## Images

![MaySpare 80-Amp 12V Continuous Duty Solenoid Battery Isolator and Starter Relay - White 4 Pin SPST - Image 1](https://m.media-amazon.com/images/I/61s9d9XXu2L.jpg)

## Questions & Answers

**Q: What do I need to be able to use as a switch between batteries and a 2000 watt inverter?**
A: If all you want to do is disconnect/connect the batteries from the inverter remotely, you need a 12v switched source to the coil and a ground. It is just a single pole single throw switch.

**Q: If contacts are copper, this does not meet requirements for 120-901.  What is the actual contact material?  What does silver pins mean?**
A: Bought 2 and both coils failed

**Q: The note "The working time could be around continuous four or five hours , stop it and then use it." What if I have a 8 hour road trip?**
A: I took a road trip 24hrs one way drove 18 hrs the first day 6 hrs the second day then turn around 4 days later repeated in the middle of summer with no problem the relay i replaced was the same make and model butI probably not the original in my 1995 Chevy conversion van relay is for charging my back battery also left  it running for 8hrs plus in 90- 100  degrees so my pets saying cool inside hope this helps

**Q: Can us you be used for a plow**
A: I believe this should work for a plow setup.   Just double check the amp draw from the plow’s specs.

## Customer Reviews

### ⭐⭐⭐⭐⭐ good value for the money
*by A***R on February 23, 2026*

works as described

### ⭐⭐⭐⭐⭐ Works great
*by D***N on November 19, 2025*

Works great

### ⭐⭐⭐⭐⭐ Great quality product
*by J***K on September 6, 2025*

Great product

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**Shop now:** [https://www.desertcart.kr/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter](https://www.desertcart.kr/products/123043634-mayspare-80-amp-12v-continuous-duty-solenoid-battery-isolator-starter)

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-09*