---
product_id: 65386271
title: "Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor"
brand: "blue sea"
price: "€ 144.88"
currency: EUR
in_stock: true
reviews_count: 2
category: "Blue Sea"
url: https://www.desertcart.de/products/65386271-blue-sea-systems-bs9003e-battery-switch-series-e-on-off
store_origin: DE
region: Germany
---

# 350A continuous current AFD models switch under load One-piece tinned copper terminals Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor

**Brand:** blue sea
**Price:** € 144.88
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up with confidence—never settle for less!

## Quick Answers

- **What is this?** Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor by blue sea
- **How much does it cost?** € 144.88 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/65386271-blue-sea-systems-bs9003e-battery-switch-series-e-on-off)

## Best For

- blue sea enthusiasts

## Why This Product

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

## Key Features

- • **Built to Last:** One-piece tinned copper terminals guarantee a secure, corrosion-resistant connection that won’t loosen over time.
- • **Switch On the Fly:** AFD models let you safely switch battery circuits while the engine runs—no alternator damage, no downtime.
- • **Safety First, Always:** Premium build quality outperforms cheap alternatives, preventing overheating and electrical fires for peace of mind.
- • **Power Through Anything:** Handles a robust 350 amps continuously for petrol and diesel engines, ensuring your power needs never falter.
- • **Effortless Installation:** Designed for quick, hassle-free setup so you can upgrade your power system without missing a beat.

## Overview

The Blue Sea Systems BS9003E Battery Switch is a high-performance, durable on/off switch designed for demanding petrol and diesel engines. Rated for 350 amps continuous current, it features one-piece tinned copper terminals for reliable, corrosion-resistant connections. Its AFD models enable safe switching under load without harming your alternator, making it the trusted choice for professional-grade marine and automotive power management.

## Description

Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor : desertcart.co.uk: Business, Industry & Science

Review: Buy this, not the cheap Chinese switches. Safety is worth the price. - Bought this for our self built camper to replace one of the cheap power switches that are all too common on desertcart. The old one was getting extremely hot even though it was operating well below its rates current, hot enough that what alerted us to it was the smell, it had only been installed for a couple of days. You get what you pay for, the quality of this switch is great, handles higher currents than the last one without even getting warm. I'm confident this one is actually rated for the current it states. Easy to install, works great. The old one was dangerous. Don't buy the the cheap Chinese ones, they're dangerous & a false economy. Spend the money, buy one of these. It's not worth the risk of an electrical fire. We've been living in our van full time for a year & a half & we've never had an issue with this switch with it regularly handling 165A when running an air fryer on our 12V leisure battery.
Review: Best battery switch for your boat with big engines - Very well made and easy to fit and sturdy when in place and reassuring to use compared to the usual red key switches normally fitted

## Features

- 350 Amp continuous for petrol and diesel indoor engines
- One-piece tinned copper terminals design that will not disengage over time
- AFD models allow switching while the engine is running without damaging the alternator

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000MMC914 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 101,442 in Automotive ( See Top 100 in Automotive ) 7 in Boat Battery Switches 292 in Car Battery Switches |
| Colour | Multi-coloured |
| Customer Reviews | 4.7 4.7 out of 5 stars (661) |
| Date First Available | 1 Oct. 2001 |
| Included components | Components included in the description |
| Item Package Quantity | 1 |
| Item Weight | 590 g |
| Item model number | 9003E-BSS |
| Manufacturer | Blue Sea Systems |
| Number of Pieces | 5 |
| Part number | 9003e |
| Pattern | Switch |
| Product Dimensions | 7.37 x 16.21 x 21.92 cm; 590 g |
| Size | No Size |
| Style | On-off |
| Switch Type | 1-way |
| Voltage | 48 Volts |
| Wattage | 16800 watts |

## Product Details

- **Brand:** Blue Sea
- **Connector type:** IDC
- **Contact type:** Normally Open
- **Current rating:** 350 Amps
- **Item dimensions L x W x H:** 7.4 x 16.2 x 21.9 centimetres
- **Material:** Plastic
- **Operating voltage:** 48 Volts
- **Operation mode:** ON-OFF
- **Switch type:** Push Button
- **Terminal:** Stud

## Images

![Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor - Image 1](https://m.media-amazon.com/images/I/41Br+QfuncL.jpg)
![Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor - Image 2](https://m.media-amazon.com/images/I/51LB3UAU47L.jpg)
![Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor - Image 3](https://m.media-amazon.com/images/I/51lY8+-YdRL.jpg)
![Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor - Image 4](https://m.media-amazon.com/images/I/51tvx4OvJML.jpg)
![Blue Sea Systems BS9003E Battery Switch Series e on/Off, Unisex-Adult, Multicolor - Image 5](https://m.media-amazon.com/images/I/51zM3e8DqxL.jpg)

## Questions & Answers

**Q: can the switch work on 52Vdc system**
A: No,  says maximim 48v on the switch.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Buy this, not the cheap Chinese switches. Safety is worth the price.
*by O***O on 19 September 2025*

Bought this for our self built camper to replace one of the cheap power switches that are all too common on Amazon. The old one was getting extremely hot even though it was operating well below its rates current, hot enough that what alerted us to it was the smell, it had only been installed for a couple of days. You get what you pay for, the quality of this switch is great, handles higher currents than the last one without even getting warm. I'm confident this one is actually rated for the current it states. Easy to install, works great. The old one was dangerous. Don't buy the the cheap Chinese ones, they're dangerous & a false economy. Spend the money, buy one of these. It's not worth the risk of an electrical fire. We've been living in our van full time for a year & a half & we've never had an issue with this switch with it regularly handling 165A when running an air fryer on our 12V leisure battery.

### ⭐⭐⭐⭐⭐ Best battery switch for your boat with big engines
*by C***Y on 6 August 2013*

Very well made and easy to fit and sturdy when in place and reassuring to use compared to the usual red key switches normally fitted

## Frequently Bought Together

- Blue Sea Systems 9003E e-Series Battery Switch, On/Off, Red
- Blue Sea Systems 5026 ST Blade Fuse Block 12 Circuit with Ground and Cover
- 16 Gauge Marine Wire 16 AWG Marine Grade Wire Include 16AWG 120FT Red & 120FT Black,16 Gauge Tinned Copper Electrical Cable for Boat Automotive Speakers Lighting Solar Outdoor RV Camper Trailer

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-02-01*