---
product_id: 394622716
title: "Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut Off (with Long Bolt)"
brand: "ampper"
price: "A$24"
currency: AUD
in_stock: true
reviews_count: 6
category: "Ampper"
url: https://www.desertcart.com.au/products/394622716-ampper-side-post-battery-disconnect-switch-battery-master-switch-isolator
store_origin: AU
region: Australia
---

# 125A heavy-duty current rating Knob-type easy twist on/off Solid brass corrosion-resistant build Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut Off (with Long Bolt)

**Brand:** ampper
**Price:** A$24
**Availability:** ✅ In Stock

## Summary

> 🔋 Twist, isolate, and power down—because your ride deserves the best cut-off switch.

## Quick Answers

- **What is this?** Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut Off (with Long Bolt) by ampper
- **How much does it cost?** A$24 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/394622716-ampper-side-post-battery-disconnect-switch-battery-master-switch-isolator)

## Best For

- ampper enthusiasts

## Why This Product

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

## Key Features

- • **Compact Yet Mighty:** Small footprint (3.3" x 1.5" x 1.5") packs a powerful 125A rating for reliable performance.
- • **Power Cut with a Twist:** Effortlessly isolate your battery with a simple knob turn—no tools needed.
- • **Universal Side Post Fit:** Designed specifically for 3/8" side post terminals, perfect for GM batteries and beyond.
- • **Safety Meets Convenience:** Eliminate power drain and protect your electrical system when your vehicle or boat is idle.
- • **Built to Brave the Elements:** Solid brass construction ensures rust-free, long-lasting durability for marine and automotive use.

## Overview

The Ampper Side Post Battery Disconnect Switch is a robust, knob-operated master switch designed for 12V DC systems with 3/8" side post terminals. Rated for 125 amps, it features a solid brass, corrosion-resistant body ideal for automotive, marine, and RV applications. Easy to install and operate, it safely isolates the battery to prevent power drain and protect your electrical system when not in use.

## Description

Ampper side post knob type battery disconnect master switch for Marine Car Boat RV ATV Vehicles Specifications: 1, Used for side post terminal, battery negative post 3/8" hole only. 1, On/Off 2 position. 2, Voltage: 12V, rated current: 125A. 3, Easy to install & simple to use. 4, Knob type, loose / twist of the knob, then power will cut. 5, Solid brass made, rust and corrosion resistant, durable made for safety use. 6, Can stand alone or be locked together with other switch. 7, Compatible with GM side post batteries or other batteries to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. 8, Used for Car, Vehicle, RV and Boat, also electrical equipment's switch. 9, Size: 3.3" x 1.5" x 1.5". Complete kits includes: 1 x battery switch 1 x short bolt 1 x long bolt

Review: Perfect - I wanted this device to isolate the battery on my Classic American car, hence the need for a side post fitting. Bought another one,great product.
Review: Works well

## Features

- Compatible: with a long bolt, used for side post terminal, battery negative post 3/8" hole only, DC 12 V system, rated current: 125 A, On/Off 2 position.
- Convenience: knob type, easy to install & simple to use. Loose / twist of the knob, then power will cut.
- Heavy Duty: solid brass made, rust and corrosion resistant, durable made for safety use.
- Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely.
- Compatible with GM side post batteries or other batteries which have a 3/8" side post terminal, also used for electrical equipment.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07JZ8MKL2 |
| Best Sellers Rank | 45,793 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 3 in Boat Battery Switches |
| Brand | Ampper |
| Customer Reviews | 4.2 4.2 out of 5 stars (4,470) |
| Date First Available | 18 Dec. 2016 |
| Exterior | metal |
| Item Weight | 150 g |
| Item model number | Am-CBS31 |
| Lift type | ON-OFF |
| Manufacturer | Ampper |
| Manufacturer part number | Am-CBS31 |
| Model | Am-CBS31 |
| Product Dimensions | 9.91 x 3.81 x 3.81 cm; 150.25 g |
| Special Features | Used for car battery systems, disconnects the battery safely, eliminate any power draw from the battery when vehicle or boat is not in use, isolate and secure the electrical system, used for GM side post batteries |
| Voltage | 12 Volts |

## Product Details

- **Brand:** Ampper
- **Connector type:** Screw In
- **Contact type:** Normally Open
- **Current rating:** 125 Amps
- **Item dimensions L x W x H:** 9.9 x 3.8 x 3.8 centimetres
- **Material:** Stainless Steel
- **Operating voltage:** 12 Volts
- **Operation mode:** ON-OFF
- **Switch type:** Kill Switch
- **Terminal:** Blade

## Images

![Ampper Side Post Battery Disconnect Switch, Battery Master Switch Isolator for Power Disconnect Cut Off (with Long Bolt) - Image 1](https://m.media-amazon.com/images/I/61OIMdqQo2L.jpg)

## Available Options

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

## Questions & Answers

**Q: Will this handle 4 rv house batteries if mounted on neg post. Also are 6 volt post long enough to get a nut on?**
A: It is rated for 125 amps, so if your draw is no more than that, it's fine.  As for 6 volt posts, I have no Idea.  I installed mine on a ZTR mower so I had to use some of my own hardware.

**Q: Will this wotrk on a chev s-10**
A: It's installed on the battery it doesn't matter what make or model your vehicle is . Installed correctly it will work on any vehicle .

**Q: I have a dodge journey 2009 will this work**
A: If you have a side terminal battery then this will work.  If you have a top terminal then there are other products available that will work in that situation.

**Q: Is this switch rated high enough to handle my group 78 battery that has 850 cca mounted in my '76 chevy custom deluxe k10?**
A: I use it in my street rod ( dual batteries)   on the NEGATIVE TERMINAL !  and works fine...I've been using  the switch  for over 12 yrs   and on 2 other street rods  with NO failure

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect
*by A***R on 23 October 2023*

I wanted this device to isolate the battery on my Classic American car, hence the need for a side post fitting. Bought another one,great product.

### ⭐⭐⭐⭐⭐ Review
*by P***R on 19 November 2025*

Works well

### ⭐⭐⭐⭐⭐ Review
*by B***A on 4 December 2025*

My husband has these on three of our vehicles. They work well and it’s so nice to have kill switch on the rigs we don’t drive often. These aren’t too big, they look fine and are easy to install.

## Frequently Bought Together

- Side Post Battery Disconnect Switch, Ampper Battery Master Switch Isolator for Power Disconnect Cut Off (with Long Bolt)
- Top Post Battery Disconnect Switch - Quick Disconnect Battery Cut Off Switch for Car Truck Marine RV and Electrical Equipment - 12V/125A - Red
- Top Post Battery Disconnect Switch, Ampper Battery Master Switch Isolator for Power Disconnect Cut Off (1 Pack)

---

## 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.com.au/products/394622716-ampper-side-post-battery-disconnect-switch-battery-master-switch-isolator](https://www.desertcart.com.au/products/394622716-ampper-side-post-battery-disconnect-switch-battery-master-switch-isolator)

---

*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-14*