---
product_id: 8376872
title: "Blue Sea Systems e-Series Battery Switch Single Circuit, On/ Off, 48V DC, 350 A, Red, 9003e"
brand: "blue sea systems"
price: "€ 86.40"
currency: EUR
in_stock: true
category: "Blue Sea Systems"
url: https://www.desertcart.at/products/8376872-blue-sea-systems-e-series-battery-switch-single-circuit-on
store_origin: AT
region: Austria
---

# 48V DC power control 350A high current rating Flexible surface/rear mounting Blue Sea Systems e-Series Battery Switch Single Circuit, On/ Off, 48V DC, 350 A, Red, 9003e

**Brand:** blue sea systems
**Price:** € 86.40
**Availability:** ✅ In Stock

## Summary

> ⚓ Command your marine power with precision and style

## Quick Answers

- **What is this?** Blue Sea Systems e-Series Battery Switch Single Circuit, On/ Off, 48V DC, 350 A, Red, 9003e by blue sea systems
- **How much does it cost?** € 86.40 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/8376872-blue-sea-systems-e-series-battery-switch-single-circuit-on)

## 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

- • **Mount your way:** Versatile surface or rear panel mounting adapts to your setup
- • **Compact yet mighty:** Small footprint fits tight spaces without compromising performance
- • **Operate blindfolded:** Textured knob ensures easy, low-light operation—never fumble in the dark
- • **Built for the elements:** IP66 rated for dust and water resistance, perfect for marine environments
- • **Power up with confidence:** Handles a robust 350 amps for demanding marine power needs

## Overview

The Blue Sea Systems 9003E e-Series Battery Switch is a high-performance, single circuit on/off switch designed for marine applications. Rated for 48V DC and 350 amps, it offers reliable power isolation during maintenance or storage. Its compact design and flexible mounting options make installation effortless even in tight spaces. Durable tin-plated copper terminals ensure secure, low-resistance connections, while the textured knob allows easy operation in low light. IP66 protection and ignition safety make it a trusted choice for professional boaters.

## Description

The Blue Sea Systems 9003E e-Series battery switch provides simple and reliable single circuit power control for marine electrical systems. Designed to turn one battery bank on or off, it helps isolate electrical loads during maintenance or storage. Its compact footprint allows installation in tight spaces, while flexible mounting options support both surface and rear panel configurations. The switch is ignition protected for safe use in gasoline powered boat engine rooms. Tin plated copper terminal studs are designed to accept multiple cable connections and provide secure, low resistance contact. A textured knob and face enable operation in low light conditions. This model does not include an alternator field disconnect.

## Features

- SINGLE CIRCUIT CONTROL: Turns one battery bank on or off; isolates power during maintenance or storage
- COMPACT DESIGN: Small footprint supports installation in tight spaces; flexible placement options
- FLEXIBLE MOUNTING: Surface or rear panel mounting supports multiple installation configurations
- DURABLE CONNECTIONS: Tin plated copper studs accept multiple cables; support secure high torque connections
- LOW LIGHT OPERATION: Textured knob and face allow operation by feel in low visibility conditions

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000MMC914 |
| Actuator Type | Rotary |
| Best Sellers Rank | #6,801 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #2 in Boat Battery Switches |
| Brand | Blue Sea Systems |
| Brand Name | Blue Sea Systems |
| Circuit Type | 1-way |
| Color | Red |
| Compatible Devices | Boats |
| Compatible with Vehicle Type | Boat |
| Connectivity Protocol | X-10 |
| Connector Type | Idc |
| Contact Material | Tinned Copper |
| Contact Type | Normally Open |
| Control Method | Touch |
| Control Type | ON/OFF |
| Controller Type | Boat |
| Current Rating | 350 Amps |
| Customer Reviews | 4.7 out of 5 stars 723 Reviews |
| Global Trade Identification Number | 00632085900359 |
| Included Components | e-Series On Off Battery Switch |
| International Protection Rating | IP66 |
| Item Dimensions | 2.9 x 6.38 x 8.63 inches |
| Item Type Name | BATTERY SWITCH ON/OFF |
| Item Weight | 0.59 Kilograms |
| Lower Temperature Rating | 1 Degrees Celsius |
| Manufacturer | Blue Sea Systems |
| Material Type | Plastic |
| Model | 9003e |
| Mounting Type | Panel Mount, Surface Mount |
| Number of Items | 1 |
| Number of Positions | 2 |
| Operating Voltage | 48 Volts (DC) |
| Operation Mode | ON-OFF |
| Part Number | 9003e-BSS |
| Smart Home Compatibility | Not Smart Home Compatible |
| Switch Type | Rotary |
| Terminal | Spdt |
| UPC | 632085900359 |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 1 Degrees Fahrenheit |
| Warranty Description | Limited Lifetime Warranty |
| Wattage | 16800 watts |

## Product Details

- **Brand:** Blue Sea Systems
- **Connector Type:** Idc
- **Contact Type:** Normally Open
- **Current Rating:** 1 Microamps
- **Item dimensions L x W x H:** 2.9 x 6.38 x 8.63 inches
- **Material:** Metal
- **Operating Voltage:** 48 Volts
- **Operation Mode:** ON-OFF-ON
- **Switch Type:** Temperature Switch
- **Terminal:** Spdt

## Images

![Blue Sea Systems e-Series Battery Switch Single Circuit, On/ Off, 48V DC, 350 A, Red, 9003e - Image 1](https://m.media-amazon.com/images/I/71f6P+iBrcL.jpg)

## Available Options

This product comes in different **Pattern, 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.

## Frequently Bought Together

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*Product available on Desertcart Austria*
*Store origin: AT*
*Last updated: 2026-07-10*