---
product_id: 12197948
title: "Blue Sea Systems 5251 MIDI Fuse 40A"
brand: "blue sea systems"
price: "€ 22.19"
currency: EUR
in_stock: true
reviews_count: 9
category: "Blue Sea Systems"
url: https://www.desertcart.pt/products/12197948-blue-sea-systems-5251-midi-fuse-40a
store_origin: PT
region: Portugal
---

# 40A max current compact 4.5-inch length tin-plated corrosion-resistant tabs Blue Sea Systems 5251 MIDI Fuse 40A

**Brand:** blue sea systems
**Price:** € 22.19
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up with confidence — fuse smarter, not harder!

## Quick Answers

- **What is this?** Blue Sea Systems 5251 MIDI Fuse 40A by blue sea systems
- **How much does it cost?** € 22.19 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/12197948-blue-sea-systems-5251-midi-fuse-40a)

## 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

- • **DIY-Friendly Mounting:** Through-hole tabs allow secure, customizable installation on aluminum bus bars or custom fuse blocks.
- • **Compact & Space-Smart Design:** Slim 4.5-inch length fits seamlessly into tight automotive or marine fuse blocks.
- • **Visible Fuse Status Indicator:** Quickly identify blown fuses to minimize downtime and maintenance hassle.
- • **Reliable 40A Circuit Protection:** Engineered to handle up to 40 amps for robust electronic safety.
- • **Corrosion-Resistant Tin-Plated Tabs:** Ensures long-lasting, low-resistance connections even in harsh environments.

## Overview

The Blue Sea Systems 5251 MIDI Fuse 40A is a premium, fast-acting fuse designed for automotive and marine circuit protection. Featuring corrosion-resistant tin-plated tabs and a compact form factor, it delivers reliable 40-amp current handling with visible blown fuse indication. Ideal for professionals and DIY enthusiasts seeking durable, low-resistance connections and easy installation in demanding environments.

## Description

Compact fuses for main or branch circuit protection Standard circuit protection device for automobiles and trucks Tin-plated connector blades for corrosion resistance.

Review: Well Designed Fuses For a Reasonable Price - I have degrees and certifications in electronics, so I'm a little fussy about electrical safety and functionality, I really like these fuses because of tab connections, and for visible indication of blown fuse. With most of the consumer-grade high-current low-voltage fuses, the weakest part of the system is the fuse holder. Usually they are made of cheap plastic, often times with undersized wire, and often times do not make a reliable low-resistance connection to the fuse. All of these things add up to a risk of over-heating, and plastic melting, or worse. The tabs on these fuses make for reliable connections, which is what you want, especially if there are fathoms of cold water below your boat. I recently rebuilt the DC power distribution system in our older camp trailer that we inherited. The factory installed fuses were a mess. They were hard to access, hard to tell if they were blown, and hard to remove/replace. I took them all out and replaced them all with these Blue Sea fuses. Because the factory fuse blocks for these Blue Sea fuses are kind of expensive and don’t have hold enough fuses for my need, and because I enjoy making my own stuff that is better than stuff made in a Chinese factory, I made my own fuse block, which was fairly easy because the tabs on these fuses allow them to be screwed securely to an aluminum buss-bar. My fuse block is a collection of 1/2" thick aluminum blocks that are drilled and tapped for 10-24 screws for the tabs on these fuses, and for ring terminals on the ends of interconnection wires. The aluminum blocks and the buss bar are mounted on a 3/4 inch thick oak board. I now have rock solid, low-resistance fuse connections that I'm sure will perform well for many years. I'm quite happy with these fuses. They are reasonably priced and of good quality.
Review: Great product - Arrived as advertised, works as advertised. 10/10

## Features

- Package Dimensions: 0.75 H x 4.5 L x 1.5 W (inches)
- Fast-acting type fuses ideal for electronic devices
- Package Weight: 0.35 pounds
- Country of Origin : United States

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004ZJ0QRO |
| Best Sellers Rank | #36,044 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Fuse Blocks (Tools & Home Improvement) |
| Brand Name | Blue Sea Systems |
| Color | Multicolor |
| Customer Reviews | 4.8 4.8 out of 5 stars (88) |
| Global Trade Identification Number | 00632085052515 |
| Included Components | MIDI FUSE 40A |
| Item Dimensions | 3 x 2 x 1 inches |
| Item Type Name | MIDI FUSE 40A |
| Manufacturer | Blue Sea Systems |
| Material Type | Tin plated |
| Maximum Current | 40 Amps |
| Model | 5251 |
| Mounting Type | Through-Hole Mount |
| UPC | 632085052515 |
| Unit Count | 1.0 Count |
| Voltage | 32 Volts |
| Warranty Description | LIMITED WARRANTY |

## Product Details

- **AC Adapter Current:** 40 Amps
- **Brand:** Blue Sea Systems
- **Item dimensions L x W x H:** 3 x 2 x 1 inches
- **Material:** Tin plated
- **Voltage:** 32 Volts

## Images

![Blue Sea Systems 5251 MIDI Fuse 40A - Image 1](https://m.media-amazon.com/images/I/416hQ-02NWL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Well Designed Fuses For a Reasonable Price
*by A***L on October 10, 2016*

I have degrees and certifications in electronics, so I'm a little fussy about electrical safety and functionality, I really like these fuses because of tab connections, and for visible indication of blown fuse. With most of the consumer-grade high-current low-voltage fuses, the weakest part of the system is the fuse holder. Usually they are made of cheap plastic, often times with undersized wire, and often times do not make a reliable low-resistance connection to the fuse. All of these things add up to a risk of over-heating, and plastic melting, or worse. The tabs on these fuses make for reliable connections, which is what you want, especially if there are fathoms of cold water below your boat. I recently rebuilt the DC power distribution system in our older camp trailer that we inherited. The factory installed fuses were a mess. They were hard to access, hard to tell if they were blown, and hard to remove/replace. I took them all out and replaced them all with these Blue Sea fuses. Because the factory fuse blocks for these Blue Sea fuses are kind of expensive and don’t have hold enough fuses for my need, and because I enjoy making my own stuff that is better than stuff made in a Chinese factory, I made my own fuse block, which was fairly easy because the tabs on these fuses allow them to be screwed securely to an aluminum buss-bar. My fuse block is a collection of 1/2" thick aluminum blocks that are drilled and tapped for 10-24 screws for the tabs on these fuses, and for ring terminals on the ends of interconnection wires. The aluminum blocks and the buss bar are mounted on a 3/4 inch thick oak board. I now have rock solid, low-resistance fuse connections that I'm sure will perform well for many years. I'm quite happy with these fuses. They are reasonably priced and of good quality.

### ⭐⭐⭐⭐⭐ Great product
*by J***S on March 10, 2021*

Arrived as advertised, works as advertised. 10/10

### ⭐⭐⭐⭐⭐ Thoroughly pleased
*by R***R on August 19, 2021*

The delivery was next day and the part was exactly what I needed. Couldn’t have asked for better service!

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-04-23*