---
product_id: 269370263
title: "MRBF Terminal Fuse Blocks"
brand: "blue sea systems"
price: "$1662"
currency: MXN
in_stock: true
reviews_count: 5
category: "Blue Sea Systems"
url: https://www.desertcart.mx/products/269370263-mrbf-terminal-fuse-blocks
store_origin: MX
region: Mexico
---

# High-amp fuse for robust current protection Standard M8 hardware for easy stacking Weatherproof for harsh marine environments MRBF Terminal Fuse Blocks

**Brand:** blue sea systems
**Price:** $1662
**Availability:** ✅ In Stock

## Summary

> ⚓ Power up your marine setup with compact, stackable, weatherproof protection!

## Quick Answers

- **What is this?** MRBF Terminal Fuse Blocks by blue sea systems
- **How much does it cost?** $1662 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/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

- • **Versatile Compatibility:** Fits 5/16" or 3/8" ring terminals, perfect for windlass, inverter, and bow thruster circuits.
- • **Stackable Terminal Design:** Innovative isolated stud with standard M8 hardware lets you build a sleek, space-saving fuse block stack.
- • **Accidental Short Prevention:** Insulating cap guards against shorts, giving you peace of mind in every connection.
- • **Compact High-Amp Protection:** Delivers powerful DC main and accessory circuit defense without hogging precious space.
- • **Marine-Grade Weatherproofing:** Engineered to withstand open-cockpit splashes and harsh conditions, keeping your system safe and dry.

## Overview

The Blue Sea Systems MRBF Terminal Fuse Block features a new isolated stud design using standard M8 hardware for easy terminal stacking. It provides compact, high-amp fuse protection ideal for DC main, inverter, windlass, and bow thruster circuits. Weatherproof and equipped with an insulating cap, it prevents accidental shorts and withstands harsh marine environments, making it a reliable choice for small open-cockpit boats.

## 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: 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: 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 |
| Batteries | 1 Unknown batteries required. |
| Batteries Included? | No |
| Best Sellers Rank | #67,556 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #143 in Fuses & Holders |
| Brand | Blue Sea Systems |
| Color | Single Fuse |
| Customer Reviews | 4.6 4.6 out of 5 stars (865) |
| Date First Available | 6 August 2012 |
| Department | Battery Switches, Switch Panels, Electrical |
| Is Discontinued By Manufacturer | No |
| Item model number | 5191 |
| Length | 3 inches |
| Manufacturer | Blue Sea Systems |
| Material Type | Plastic |
| Number of Items | 1 |
| Product Dimensions | 16 x 6.35 x 5.08 cm; 45.36 g |
| Size | 2.40'' x .79'' |
| Style | 1 Fuse |
| Weight | 0.5 Pounds |
| connector-type | Screw |

## 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

### ⭐⭐⭐⭐⭐ Review
*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.

### ⭐⭐⭐⭐⭐ Review
*by A***R on 30 March 2025*

Well made, easy to fit

### ⭐⭐⭐⭐⭐ Review
*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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**Shop now:** [https://www.desertcart.mx/products/269370263-mrbf-terminal-fuse-blocks](https://www.desertcart.mx/products/269370263-mrbf-terminal-fuse-blocks)

---

*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-03-15*