---
product_id: 12534855
title: "Terminal Fuses"
brand: "blue sea systems"
price: "C$2255"
currency: NIO
in_stock: true
reviews_count: 8
category: "Blue Sea Systems"
url: https://www.desertcart.ni/products/12534855-terminal-fuses
store_origin: NI
region: Nicaragua
---

# 300A max current Clear viewing window ABYC ignition-protected Terminal Fuses

**Brand:** blue sea systems
**Price:** C$2255
**Availability:** ✅ In Stock

## Summary

> 🛡️ Power up with confidence—fuse your fears away!

## Quick Answers

- **What is this?** Terminal Fuses by blue sea systems
- **How much does it cost?** C$2255 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ni](https://www.desertcart.ni/products/12534855-terminal-fuses)

## 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

- • **Marine-Grade Safety:** Designed to meet rigorous ABYC standards for ignition protection, ensuring your battery circuits stay safe even in harsh marine environments.
- • **Robust Build Quality:** Constructed with fire-resistant stainless steel and nylon materials for durability and peace of mind.
- • **Instant Visual Status:** Clear viewing window lets you quickly inspect fuse condition—no guesswork, no downtime.
- • **High-Capacity Current Handling:** Supports up to 300 Amps DC at 58 Volts, perfect for demanding battery systems without compromise.
- • **Critical Overcurrent Protection:** Essential terminal fuse that acts as a frontline defense against dangerous electrical faults, safeguarding your investment and safety.

## Overview

The Blue Sea Systems 5190 Terminal Fuse is a premium marine-rated Class T fuse engineered for high-current DC battery protection up to 300 Amps and 58 Volts. Featuring a clear inspection window and ignition protection compliant with ABYC standards, it offers reliable, fire-resistant safety for critical battery circuits. Trusted by professionals and DIYers alike, this fuse is a must-have for anyone serious about safeguarding lithium and lead-acid battery setups from catastrophic failures.

## Description

The Blue Sea Systems 5190 300 A Battery Terminal Fuse is a marine‑rated MRBF fuse designed to protect large DC battery circuits when mounted on a compatible fuse block. It features a clear viewing window, is ignition‑protected, meets ABYC standards, and provides reliable overcurrent protection up to 58 V DC.

Review: Blew within seconds! Good quality - Worked great. Blew the fuse while I was installing it!
Review: DIYers for lithium battery builds remember it’s all about the AIC!! - This is a great product. Many complain about the price. But it’s a critical safety measure for life and property safety so is $80 for a fuse and holder worth getting versus some cheap Chinese thing that if the absolute worst happens (internal battery failure/ thermal runaway conditions) you want to bet your life and/or home on? Yes we have other safety devices, BMSs etc…but if you don’t plan for the worst (highly unlikely) scenario then you’re a gambler. IMHO Remember the AIC rating is super important in fuses. That’s what going to prevent an arc from forming and allowing massive current to flow not to mention it can act as an ignition source for the hydrogen gas LifePo4 batteries vent. No arc less chance of fire. With these terminal fuses keep in mind the AIC drops as your pack voltage goes up from 12v to 24/48v. I build both. The picture is of a 16s 48v LFP pack. The terminal fuse is 3rd or 4th in line of safety measures right from the start. It doesn’t have the AIC @48v to handle a serious failure, hence it’s just a part of the safety system. #1 a must - class T fuse with an AIC rating of at least 20k connected directly to the battery main positive. If you can find a 50K AIC even better. #2 BMS - great when they work but even the highest quality ones can fail you. Not something to depend on solely. #3 DC breaker - this is a cheap junk Chinese breaker that I have zero trust in. For me it’s merely a cutoff switch to the terminals. It came as part of the metal enclosure kit. I can’t find a quality breaker that fits in there unfortunately. #4 These terminal fuses. Fan to vent gas from the case with a VOC sensor I built to alert me if hydrogen gas is being vented. Also added temperature sensors on various parts of the metal case to alert me (also connected to a microcontroller I built). I changed the default settings on the BMS for short circuit amps to a much much lower numbers same with temperature settings. Since my packs pull very minuscule amount of power I’ll never come close to the 100a the bms/pack is rated for. From there it’s again a series of disconnect switches, class T fuses to the inverter. For my “worst case scenario nothing stopped an internal failure” I have CellBlockEX pellets to pour on top of the box. I also have a Lifepo4 designed fire extinguisher (yes they are different due to the LFP chemistry and the ability of LFP batteries to self ignite since they produce all the elements needed for fire on their own. I also have canisters of Stat-X First Responder Aerosol Fire Suppression to toss at a fire and run away. Is this all overkill many would say yes. I would ask that same question to them if they skimped out on parts and lost property or god forbid life. I bet I would get a different answer then. Be safe folks. While super rare, you better have measures in place to deal with the super rare possibilities. Or like I said maybe you’re a gambler. Up to you what you need to feel safe and sleep at night. Class T fuses need to be in place sometimes a lot depends on your setup. Blue sea systems gets an A+ from me. I know you are paying more for the name but I’m ok with it. YMMV! Happy DIYing! Free energy from the sun!!

## Features

- Item Package Dimension: 4.015L x 4.015W x 3.26H inches
- Item Package Weight - 0.13 Pounds
- Item Package Quantity - 1
- Product Type - TERMINAL BLOCK

## Technical Specifications

| Specification | Value |
|---------------|-------|
| AC Adapter Current | 300 Amps |
| ASIN | B001AFZL9O |
| Best Sellers Rank | #3,451 in Automotive ( See Top 100 in Automotive ) #18 in Automotive Fuses |
| Brand | Blue Sea Systems |
| Brand Name | Blue Sea Systems |
| Color | Gray |
| Customer Reviews | 4.8 out of 5 stars 1,252 Reviews |
| Included Components | BATTERY TERMINAL FUSE 300-AMP |
| Item Dimensions | 1 x 2.68 x 4.43 inches |
| Item Height | 4.43 inches |
| Item Type Name | BATTERY TERMINAL FUSE 300-AMP |
| Item Weight | 0.05 Pounds |
| Item dimensions L x W x H | 1 x 2.68 x 4.43 inches |
| Manufacturer | Blue Sea Systems |
| Material | Stainless steel and nylon" or "Fire-resistant material |
| Material Type | Stainless steel and nylon" or "Fire-resistant material |
| Maximum Current | 300 Amps |
| Model | 5190 |
| Mounting Type | Through-Hole Mount |
| UPC | 014891439740 717814042934 304077862883 687529277016 784427528872 632085051907 012301747096 |
| Unit Count | 1.0 Count |
| Voltage | 58 Volts (DC) |
| Warranty Description | LIMITED WARRANTY |

## Product Details

- **AC Adapter Current:** 300 Amps
- **Brand:** Blue Sea Systems
- **Item dimensions L x W x H:** 1 x 2.68 x 4.43 inches
- **Material:** Stainless steel and nylon" or "Fire-resistant material
- **Voltage:** 58 Volts (DC)

## Images

![Terminal Fuses - Image 1](https://m.media-amazon.com/images/I/61kUxvzYdrL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Blew within seconds! Good quality
*by B***L on November 29, 2025*

Worked great. Blew the fuse while I was installing it!

### ⭐⭐⭐⭐⭐ DIYers for lithium battery builds remember it’s all about the AIC!!
*by F***D on May 24, 2024*

This is a great product. Many complain about the price. But it’s a critical safety measure for life and property safety so is $80 for a fuse and holder worth getting versus some cheap Chinese thing that if the absolute worst happens (internal battery failure/ thermal runaway conditions) you want to bet your life and/or home on? Yes we have other safety devices, BMSs etc…but if you don’t plan for the worst (highly unlikely) scenario then you’re a gambler. IMHO Remember the AIC rating is super important in fuses. That’s what going to prevent an arc from forming and allowing massive current to flow not to mention it can act as an ignition source for the hydrogen gas LifePo4 batteries vent. No arc less chance of fire. With these terminal fuses keep in mind the AIC drops as your pack voltage goes up from 12v to 24/48v. I build both. The picture is of a 16s 48v LFP pack. The terminal fuse is 3rd or 4th in line of safety measures right from the start. It doesn’t have the AIC @48v to handle a serious failure, hence it’s just a part of the safety system. #1 a must - class T fuse with an AIC rating of at least 20k connected directly to the battery main positive. If you can find a 50K AIC even better. #2 BMS - great when they work but even the highest quality ones can fail you. Not something to depend on solely. #3 DC breaker - this is a cheap junk Chinese breaker that I have zero trust in. For me it’s merely a cutoff switch to the terminals. It came as part of the metal enclosure kit. I can’t find a quality breaker that fits in there unfortunately. #4 These terminal fuses. Fan to vent gas from the case with a VOC sensor I built to alert me if hydrogen gas is being vented. Also added temperature sensors on various parts of the metal case to alert me (also connected to a microcontroller I built). I changed the default settings on the BMS for short circuit amps to a much much lower numbers same with temperature settings. Since my packs pull very minuscule amount of power I’ll never come close to the 100a the bms/pack is rated for. From there it’s again a series of disconnect switches, class T fuses to the inverter. For my “worst case scenario nothing stopped an internal failure” I have CellBlockEX pellets to pour on top of the box. I also have a Lifepo4 designed fire extinguisher (yes they are different due to the LFP chemistry and the ability of LFP batteries to self ignite since they produce all the elements needed for fire on their own. I also have canisters of Stat-X First Responder Aerosol Fire Suppression to toss at a fire and run away. Is this all overkill many would say yes. I would ask that same question to them if they skimped out on parts and lost property or god forbid life. I bet I would get a different answer then. Be safe folks. While super rare, you better have measures in place to deal with the super rare possibilities. Or like I said maybe you’re a gambler. Up to you what you need to feel safe and sleep at night. Class T fuses need to be in place sometimes a lot depends on your setup. Blue sea systems gets an A+ from me. I know you are paying more for the name but I’m ok with it. YMMV! Happy DIYing! Free energy from the sun!!

### ⭐⭐⭐⭐⭐ Quality you can depend on.
*by U***C on November 19, 2025*

It meets the expectations on both quality of manufacturing and functionality. Its a Bussmann. Enough said .

## Frequently Bought Together

- Blue Sea Systems Terminal Fuses
- Blue Sea Systems 5191 Fuse Block Terminal 30-300 AMP
- Blue Sea Systems 6006 m-Series Battery Switch ON/OFF with Knob, Red

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*Product available on Desertcart Nicaragua*
*Store origin: NI*
*Last updated: 2026-02-07*