---
product_id: 269370263
title: "MRBF Terminal Fuse Blocks"
brand: "blue sea systems"
price: "$74"
currency: NZD
in_stock: true
reviews_count: 5
category: "Blue Sea Systems"
url: https://www.desertcart.nz/products/269370263-mrbf-terminal-fuse-blocks
store_origin: NZ
region: New Zealand
---

# 300A high-amp fuse capacity Standard M8 hardware for easy stacking Weatherproof for harsh marine environments MRBF Terminal Fuse Blocks

**Brand:** blue sea systems
**Price:** $74
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your marine setup with confidence — fuse protection that’s as sleek as your lifestyle!

## Quick Answers

- **What is this?** MRBF Terminal Fuse Blocks by blue sea systems
- **How much does it cost?** $74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/269370263-mrbf-terminal-fuse-blocks)

## 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

- • **Stackable Terminal Design:** Innovative isolated stud with standard M8 hardware lets you build compact, layered fuse blocks effortlessly.
- • **Space-Saving Compact Build:** Engineered to deliver maximum current protection even in the tightest boat or panel spaces.
- • **Safety-First Insulating Cap:** Prevents accidental shorts, ensuring your system stays secure and reliable.
- • **Marine-Grade Weatherproofing:** Built tough to withstand open-cockpit splashes and harsh outdoor conditions without fail.
- • **High-Amperage Power Protection:** Handles up to 300 amps, perfect for DC mains, inverters, and critical marine circuits.

## Overview

Blue Sea Systems MRBF Terminal Fuse Blocks feature a compact, stackable isolated stud design using standard M8 hardware, supporting up to 300 amps for high-current DC circuit protection. Weatherproof and marine-grade, they are ideal for small open-cockpit boats and harsh environments, with an insulating cap to prevent shorts and ensure safety.

## Description

Terminal Fuse BlackNew isolated stud design uses standard 5/16" hardware and permits stacking of terminals Compact, high-amp fuse-Appropriate for DC Main, inverter, windlass, and bow thruster circuit protection Provides high current protection in tight space constraints Weatherproof-suitable for small open-cockpit boats and other harsh environments Insulating cap prevents accidental shorts Use 5/16" or 3/8" ring terminal

Review: Neat arrgt. but pricey - Very neat system for mounting fuse directly to battery terminal. Changed battery lugs to cargo type so that fuse block would be mounted vertically.
Review: Good battery level protection - Well made, easy to fit

## Features

- New isolated stud design uses standard M8 (5/16") hardware and permits stacking of terminals
- Compact, high-amp fuseâAppropriate for DC Main, inverter, windlass, and bow thruster circuit protection
- Provides high current protection in tight space constraints
- Weatherproofâsuitable for small open-cockpit boats and other harsh environments
- Insulating cap prevents accidental shorts

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0019ZBTV4 |
| Best Sellers Rank | #74,486 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #177 in Fuses & Holders |
| Brand Name | Blue Sea Systems |
| Centerline Length | 2.4 Inches |
| Color | Single Fuse |
| Colour | Single Fuse |
| Connector Type | Screw |
| Connector type | Screw |
| Country Of Origin | USA |
| Current Rating | 300 Amps |
| Current rating | 300 Amps |
| Customer Reviews | 4.6 out of 5 stars 854 Reviews |
| Global Trade Identification Number | 00632085051914 |
| Item Dimensions W x H | 6.4W x 5.1H centimeters |
| Item Weight | 45 g |
| Item height | 2 inches |
| Manufacturer | Blue Sea Systems |
| Material | Plastic |
| Material Type | Plastic |
| Model | 5191 |
| Mounting Type | Panel Mount |
| Mounting type | Panel Mount |
| Number Of Contacts | 10 |
| Number Of Poles | 1 |
| Number of Positions | 1 |
| Number of contacts | 10 |
| Specification Met | Sea |
| UPC | 632085051914 |
| Unit Count | 1 Count |
| Upper Temperature Rating | 85 Degrees Celsius |
| Voltage | 58 Volts |

## Product Details

- **Connector type:** Screw
- **Current rating:** 300 Amps
- **Material:** Plastic
- **Mounting type:** Panel Mount
- **Number of contacts:** 10

## Images

![MRBF Terminal Fuse Blocks - Image 1](https://m.media-amazon.com/images/I/61vPpZ-72JL.jpg)

## Questions & Answers

**Q: Does this item come with the fuse terminal included? If so, how do I specify the amperage**
A: I just ordered three of these - they each came with a 300A fuse.  I was not expecting fuses to be included, so I had ordered them separately.  If this is not a shipping/packaging mistake, it would be nice if the seller gave the option to choose a fuse size.  While I can use a 300A on one of the terminals, I needed smaller ones for the others.  I didn't buy them weeks ago because of the relatively high price of these fuses (typically ~$15 each).  They were on sale for $10, so I got them now.

**Q: I have a new 100ah 12v lifepo battery. what fuse size do i need to go with this?**
A: At solavanbuild, I use 150 amp fuses with 1/0 AWG battery cables in most of my installs.

**Q: I'm thinking of running a charge/power wire of the alternator to a trailer battery.  Would it be OK to use this off the charge lead on the alternator?**
A: I would recommend an automatic Charing Relay  ACR. Blue sea makes great ones. I use their Mini-ACR because my boat alternator is less than 65A.  Their standard handles up to 300A.  Remember regardless, you will need TWO of these fuses, one at each battery. If your alternator puts out 60A then 75A fuses, if it puts out 100A than 130-150A fuses.

**Q: Can I use this as a bus bar (without a fuse), just to extend a 5/16 battery terminal. Thank you**
A: No you can't.. The stud is insulated from the block.. And don't grind it down. As they are meant for fuses to complete the circuit. Just buy a battery post if you need that...

## Customer Reviews

### ⭐⭐⭐⭐⭐ Neat arrgt. but pricey
*by M***T on 9 June 2014*

Very neat system for mounting fuse directly to battery terminal. Changed battery lugs to cargo type so that fuse block would be mounted vertically.

### ⭐⭐⭐⭐⭐ Good battery level protection
*by A***R on 30 March 2025*

Well made, easy to fit

### ⭐⭐⭐⭐⭐ qualité niveau supérieur
*by N***. on 23 October 2023*

Très compact, plus sécuritaire que les fusibles "inline" ou de type ANL , vous ne vous trompez pas côté qualité... n'oubliez pas de commander aussi les fusibles, elles ne sont pas incluses ...

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---

*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-05*