---
product_id: 12197948
title: "Blue Sea Systems 5251 MIDI Fuse 40A"
brand: "blue sea systems"
price: "B/.37"
currency: PAB
in_stock: true
reviews_count: 13
category: "Blue Sea Systems"
url: https://www.desertcart.com.pa/products/12197948-blue-sea-systems-5251-midi-fuse-40a
store_origin: PA
region: Panama
---

# 40A fast-acting fuse Compact 3x2x1 inch size Tin-plated corrosion resistance Blue Sea Systems 5251 MIDI Fuse 40A

**Brand:** blue sea systems
**Price:** B/.37
**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?** B/.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/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

- • **Compact & Space-Smart Design:** Fits seamlessly into tight automotive or marine fuse blocks without clutter.
- • **Visible Fuse Status Indicator:** Quickly identify blown fuses to minimize downtime and keep your systems running.
- • **Reliable 40A Fast-Acting Protection:** Engineered to instantly safeguard your circuits from overloads and short circuits.
- • **Versatile Mounting with Secure Tabs:** Easily screw into custom or factory fuse blocks for rock-solid, low-resistance connections.
- • **Corrosion-Resistant Tin-Plated Blades:** Ensures long-lasting, low-resistance connections even in harsh environments.

## Overview

The Blue Sea Systems 5251 MIDI Fuse 40A is a compact, fast-acting fuse designed for automotive and marine circuit protection. Featuring tin-plated blades for corrosion resistance and secure through-hole mounting tabs, it delivers reliable, low-resistance connections. Ideal for professionals who demand durability and quick fuse status visibility, this 32V, 40A fuse is a trusted choice for safeguarding critical electrical systems.

## 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: Fits 2005 Mercedes S500 - Fit my 2005 S500. My dad connected a jumper back backwards and blew this fuse. It's under the front passenger carpet and fixed my issue perfectly
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.

## 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 |
|---------------|-------|
| AC Adapter Current | 40 Amps |
| ASIN | B004ZJ0QRO |
| Best Sellers Rank | #44,126 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #5 in Fuse Blocks (Tools & Home Improvement) |
| Brand | Blue Sea Systems |
| Color | Multicolor |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,137) |
| Date First Available | May 6, 2011 |
| Global Trade Identification Number | 00632085052515 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.317 ounces |
| Item dimensions L x W x H | 3 x 2 x 1 inches |
| Item model number | 5251 |
| Manufacturer | Blue Sea Systems |
| Manufacturer Part Number | 5251 |
| Material | Tin plated |
| Model | MIDI FUSE 40A |
| Mounting Type | Through-Hole Mount |
| Product Dimensions | 3 x 2 x 1 inches |
| UPC | 632085052515 |
| Unit Count | 1.0 Count |
| Voltage | 32 Volts |

## 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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Fits 2005 Mercedes S500
*by M***X on January 6, 2026*

Fit my 2005 S500. My dad connected a jumper back backwards and blew this fuse. It's under the front passenger carpet and fixed my issue perfectly

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Perfect fit
*by A***R on August 14, 2025*

My local parts stores did not know what is was looking for, but found these fast have had it installed for a few months, gone on road trips no issues work great easy to install took like 5 mins to get tools remove and replace, good quality, came with spares shipped out fast

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---

*Product available on Desertcart Panama*
*Store origin: PA*
*Last updated: 2026-01-22*