---
product_id: 3836489
title: "5191"
brand: "blue sea systems"
price: "8665 som"
currency: KGS
in_stock: null
reviews_count: 13
category: "Blue Sea Systems"
url: https://www.desertcart.kg/products/3836489-5191
store_origin: KG
region: Kyrgyzstan
---

# 58V max voltage 300A max current per block Compact 2.5" x 2" size 5191

**Brand:** blue sea systems
**Price:** 8665 som
**Availability:** ❌ Out of Stock

## Summary

> ⚡ Fuse your circuits with confidence — power meets precision!

## Quick Answers

- **What is this?** 5191 by blue sea systems
- **How much does it cost?** 8665 som with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/3836489-5191)

## 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

- • **Ignition-Ready:** Ignition protected when paired with MRBF fuses for seamless vehicle integration.
- • **Foolproof Safety:** Insulating cap prevents accidental shorts, ensuring peace of mind.
- • **Powerhouse Protection:** Handles up to 58V DC and 300A per block for robust circuit safety.
- • **Marine-Grade Durability:** Weatherproof design built to withstand harsh open-cockpit and marine environments.
- • **Universal Fit & Easy Install:** Compact footprint with corrosion-resistant materials and clear labeling for quick setup.

## Overview

The Blue Sea Systems 5191 Fuse Block Terminal is a compact, marine-grade DC fuse block designed for high-amp circuit protection up to 58V and 300A. Weatherproof and ignition protected, it’s ideal for boats, RVs, and vehicles requiring reliable, organized fuse management. Its universal fit and corrosion-resistant build make it a top choice for professionals upgrading or safeguarding their electrical systems.

## Description

The Blue Sea Systems 5191 Fuse Block Terminal (30–300 AMP) is a rugged marine‑grade DC fuse block that accepts 30–300 A MRBF battery terminal fuses to protect multiple circuits in boat or vehicle electrical systems. Designed for easy installation with corrosion‑resistant materials and clear amperage labeling, it provides organized, high‑capacity overcurrent protection for large battery banks and accessory loads.

Review: Good design and well made - This compact, well-made design worked perfectly in my fifth-wheel RV. I made the switch from lead acid to LiFePO4 battery power with solar charging. I needed a compact device to provide a primary fused circuit breaker right at my 300 Sh battery. This does the job of providing protection at a reasonable cost.
Review: High quality! - Using this to fuse a 4 gauge OFC wire directly at my cars battery. It's going to the alternator positive for part of "the big 3" upgrade. I'd say this is the best method for fusing the positive wire on the big 3. Most people leave their positive wire unfused for the big 3. I felt an inline fuse wasn't the best solution for such a short run and still having 6-8in of unfused wire. I'd like to even replace the inline fuse with one of these going to my audio system.

## Features

- Voltage Max Operating: 58V DC, Amps Max Operating: 300A per block, Terminal Fuses Avail.: 30A-300A, Terminal Stud Size: 5/16"-18 (8mm), Mounting Hole Size: 10 (5mm)3/8"
- Compact, high-amp fuse—appropriate for DC Main, inverter, windlass, and bow thruster circuit protection
- Weatherproof – suitable for small open-cockpit boats and other harsh environments
- Insulating cap prevents accidental shorts
- Ignition protected when used with MRBF fuses
- Fuses sold separately
- Fit type: Universal Fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0019ZBTV4 |
| Batteries | 1 Unknown batteries required. |
| Best Sellers Rank | #15,282 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2 in Fuse Blocks (Tools & Home Improvement) |
| Brand | Blue Sea Systems |
| Color | Single Fuse |
| Connector Type | Screw |
| Current Rating | 300 Amps |
| Date First Available | October 1, 2001 |
| Department | Unisex-Adult |
| Gauge | 1.0 |
| Global Trade Identification Number | 00632085051914 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.6 ounces |
| Item model number | 5191 |
| Manufacturer | Blue Sea Systems |
| Material | Plastic |
| Mounting Type | hole mount |
| Number Of Contacts | 1 |
| Number Of Poles | 1 |
| Product Dimensions | 2.5"W x 2"H |
| Specification Met | Sea |
| UPC | 632085051914 |
| Voltage | 58 Volts |

## Product Details

- **Brand:** Blue Sea Systems
- **Color:** Single Fuse
- **Connector Type:** Screw
- **Current Rating:** 300 Amps
- **Gauge:** 1.0
- **Material:** Plastic
- **Mounting Type:** hole mount
- **Number Of Contacts:** 1
- **Number Of Poles:** 1
- **Voltage:** 58 Volts

## Images

![5191 - Image 1](https://m.media-amazon.com/images/I/41VICJoVBWL.jpg)
![5191 - Image 2](https://m.media-amazon.com/images/I/41wSzfaD3cL.jpg)
![5191 - Image 3](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

### ⭐⭐⭐⭐⭐ Good design and well made
*by M***N on January 2, 2026*

This compact, well-made design worked perfectly in my fifth-wheel RV. I made the switch from lead acid to LiFePO4 battery power with solar charging. I needed a compact device to provide a primary fused circuit breaker right at my 300 Sh battery. This does the job of providing protection at a reasonable cost.

### ⭐⭐⭐⭐⭐ High quality!
*by M***T on November 25, 2025*

Using this to fuse a 4 gauge OFC wire directly at my cars battery. It's going to the alternator positive for part of "the big 3" upgrade. I'd say this is the best method for fusing the positive wire on the big 3. Most people leave their positive wire unfused for the big 3. I felt an inline fuse wasn't the best solution for such a short run and still having 6-8in of unfused wire. I'd like to even replace the inline fuse with one of these going to my audio system.

### ⭐⭐⭐⭐⭐ Genuine Eaton part.
*by J***. on July 15, 2025*

Why did you pick this product vs others?: It's the highest rated seller for this product. Genuine Eaton part. Photos show it having fuses but it does not come with fuses. Safety: These should be standard on all electric carts and scooters. These should also be standard on anything with long runs of battery cable.

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**Shop now:** [https://www.desertcart.kg/products/3836489-5191](https://www.desertcart.kg/products/3836489-5191)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-23*