---
product_id: 264101484
title: "Blue Sea Systems - Battery Switch ON/Off AFD"
brand: "blue sea systems"
price: "€ 92.02"
currency: EUR
in_stock: true
reviews_count: 6
category: "Blue Sea Systems"
url: https://www.desertcart.be/products/264101484-blue-sea-systems-battery-switch-on-off-afd
store_origin: BE
region: Belgium
---

# 350A max current capacity Fits 4/0 AWG cables, 3/8" studs Ignition protected for gasoline boats Blue Sea Systems - Battery Switch ON/Off AFD

**Brand:** blue sea systems
**Price:** € 92.02
**Availability:** ✅ In Stock

## Summary

> 🔋 Switch to power, switch to peace of mind!

## Quick Answers

- **What is this?** Blue Sea Systems - Battery Switch ON/Off AFD by blue sea systems
- **How much does it cost?** € 92.02 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/264101484-blue-sea-systems-battery-switch-on-off-afd)

## Best For

- blue sea systems enthusiasts

## Why This Product

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

## Key Features

- • **Universal Fit:** Compatible with most Perko and Guest switch hole patterns for seamless upgrades
- • **Safe & Reliable:** Ignition protected and ABYC/ISO 8846 certified for worry-free marine use
- • **Powerhouse Performance:** Handles up to 350 amps for heavy-duty battery control
- • **Flexible Mounting Options:** Surface, rear, or flush panel mounting to suit any installation style
- • **Corrosion-Resistant Connectivity:** Tin-plated copper studs ensure maximum conductivity and long-lasting durability

## Overview

The Blue Sea Systems 350 Amp E-Series Battery Switch offers robust single-circuit ON/OFF control with ignition protection, making it ideal for gasoline-powered boats. Featuring tin-plated copper studs that accept up to 4/0 AWG cables and multiple mounting options, this switch combines durability, safety, and versatile installation in a compact, corrosion-resistant design.

## Description

From the manufacturer Blue Sea Systems 350 Amp E-Series Battery Switches Details Tin-plated copper studs for maximum conductivity and corrosion resistance Accepts up to 4/0 AWG battery cables Studs accepts 3/8" (M10) ring terminals 7/8" (22mm) stud length accepts multiple cable terminals Blue Sea Systems one-piece terminal stud design never loosens over time Fits most Perko and Guest low amperage battery switch hole patterns Case design allows surface, rear, or front panel mounting options Tactile indicator conveys knob position by feel e-Series On Off Battery Switch Switches a single battery to a single load group Ignition protected—safe for installation aboard gasoline powered boats Case design allows surface or rear panel mounting

Review: Great - Quality switch
Review: Quality Item - Quality Item, but expensive for what it is. Bolts require 10mm Cable Lugs for attachment.

## Features

- Single Circuit ON-OFF. Switches a single battery to a single load group
- Ignition protected—safe for installation aboard gasoline powered boats

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000MMC914 |
| Actuator Type | Push Button |
| Brand | Blue Sea Systems |
| Brand Name | Blue Sea Systems |
| Circuit Type | 1-way |
| Color | Red |
| Compatible Devices | Vehicles or boats with an electrical system that uses a 2 pin battery isolator switch with a SPDT connector, operates at 48 volts and can handle up to 350 amps. May also be compatible with other Blue Sea Systems devices that use similar battery isolators. |
| Compatible with Vehicle Type | Boat |
| Connectivity Protocol | X-10 |
| Connector Type | Idc |
| Connector type | Idc |
| Contact Material | Stainless Steel |
| Contact Type | Normally Open |
| Contact type | Normally Open |
| Control Method | Touch |
| Control Type | touch |
| Controller Type | Ring |
| Country Of Origin | USA |
| Current Rating | 1 Microamps |
| Current rating | 1 Microamps |
| Customer Reviews | 4.8 out of 5 stars 687 Reviews |
| Global Trade Identification Number | 00632085900359 |
| Included Components | Great Product |
| International Protection Rating | IP66 |
| Item Dimensions | 7.4 x 16.2 x 21.9 centimeters |
| Item Type Name | Great Product |
| Item Weight | 0.59 Kilograms |
| Lower Temperature Rating | 1 Degrees Celsius |
| Manufacturer | BLUE SEA |
| Material Type | Plastic |
| Model | 9003e |
| Mounting Type | Flush-mounted or surface mounted |
| Number of Items | 1 |
| Number of Positions | 2 |
| Operating Voltage | 48 Volts |
| Operating voltage | 48 Volts |
| Operation Mode | ON-OFF-ON |
| Operation mode | ON-OFF-ON |
| Part Number | 9003e-BSS |
| Smart Home Compatibility | Not Smart Home Compatible |
| Specification Met | ABYC, ISO 8846, IP66 |
| Switch Type | On-Off |
| Terminal | Stud |
| UPC | 632085900359 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 1 Degrees Fahrenheit |
| Warranty Description | LIMITED WARRANTY |
| Wattage | 16800 watts |

## Product Details

- **Connector type:** Idc
- **Contact type:** Normally Open
- **Current rating:** 1 Microamps
- **Operating voltage:** 48 Volts
- **Operation mode:** ON-OFF-ON

## Images

![Blue Sea Systems - Battery Switch ON/Off AFD - Image 1](https://m.media-amazon.com/images/I/71f6P+iBrcL.jpg)
![Blue Sea Systems - Battery Switch ON/Off AFD - Image 2](https://m.media-amazon.com/images/I/71dPRjdTm3L.jpg)
![Blue Sea Systems - Battery Switch ON/Off AFD - Image 3](https://m.media-amazon.com/images/I/71H5OViAhEL.jpg)
![Blue Sea Systems - Battery Switch ON/Off AFD - Image 4](https://m.media-amazon.com/images/I/71suH1AIyOL.jpg)
![Blue Sea Systems - Battery Switch ON/Off AFD - Image 5](https://m.media-amazon.com/images/I/71897HAy98L.jpg)

## Available Options

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

## Questions & Answers

**Q: I'm considering using this as a battery isolator for a winch on my Jeep. Can it handle the current? and what are the physical dimensions?**
A: Your winch maker will list amperage for various amounts of load.  Also switches will show three amperages they can tolerate for different amounts of time.  So this switch is rated for 350 amps "continuous" (ie on for hours or permanently) 600 amps "intermittent" (for five minutes according to specs), and 1,200 amps "cranking"/peak for 30 seconds. OK so my SmittyBilt 9500 XRC Generation 3 winch has the following draws:  80 amps pulling zero lbs (winding rope in),  160 amps pulling 2,000 lbs, 220 amps pulling 4,000 lbs,  280 amps pulling 6,000, 340 amps pulling 8,000 lbs, and 385 amps pulling maximum of 9,500 lbs. H20 smitty and Second Gen XRC smitty use about 10% more amps. Also you "should" have a safety margin of 20%, ie no more than 80%. Now that means switch is ok continious running my winch are 2/3 of max load,  and switch is fine running extreme max of winch load five minutes, five minutes rest, five minutes run, etc. BUT if you are anywhere over 50% of winch capacity/load  you are going to run winch five minutes and rest the winch for five minutes anyway. so if your numbers are like mine you are ok. Check your winch makers specs on their website. Look until you find all numbers for the range of loads since the basic single amperage number they will list will be about 60% of max.  I would say 90% of up to 12,000 lb winches are ok with this switch. But that presupposes you have at least read up on winching and know that you will damage your winch if you pull at max for more than four or five minutes. goodluck. PS blue sea's web page lists the contentious, intermittent five minutes and peak 20 seconds for all its switches. The other red "m" model is 300 continuous, this "E" is 350 continuous, and the gray one is 600, 900,1750

**Q: where can I get wiring instructions with diagram?**
A: You tube has a few I found helpful.

**Q: Package says it’s compatible with up to 4/0 awg. my batter bank is 200a lithium tuning through 2/0 awg wire to my bus bar. will this switch work?**
A: It is compatible with any wire that fits the terminals. AWG 4, 2, or 0. The important thing is the current and voltage. At 48 volts this switch should be good at 233 amps continuously.  Here is my complete review: Fabulous switch. I have mine on my golf car and switch between two 48 volt battery banks; It is specified at Continuous rating: 350A, Maximum voltage: 32V DC. Doing the math: Power = Current x Voltage. Thus, 350 x 32 = 11,200 Watts that this switch can handle. So, 11,200 / 48 = 233 Amps continuous ... at 48 volts this switch should be good at 233 amps continuously. see less

**Q: What is alternator field disconnect vs the regular product without AFD? Looking to use on a camp trailer.**
A: You do not need afd on a trailer, only on a vehicle with an alternator such as a motorhome or boat. It protects the alternator diodes upon disconnect.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great
*by B***R on 17 November 2023*

Quality switch

### ⭐⭐⭐⭐⭐ Quality Item
*by R***. on 6 October 2020*

Quality Item, but expensive for what it is. Bolts require 10mm Cable Lugs for attachment.

### ⭐⭐⭐⭐⭐ Ok
*by R***O on 29 October 2018*

Muy practico

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*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-07-24*