MRBF Surface Mount Fuse Block - Independent Source - MRBF Surface Mount Fuse Block - Independent Source

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Blue Sea Systems

5194-BSS

MRBF surface-mount fuse block - Independent source

The Blue Sea MRBF Surface Mount 5194-BSS fuse block is a compact solution for independent protection of three high-current circuits. Designed for surface mounting, it uses MRBF fuses to secure critical equipment such as thrusters or converters. The product is supplied as a bare block.

Source: Independent

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Retail priceBenefit from the professional rate

$68.83 USD

$68.83 USD ~~$82.90 USD~~

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In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

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Support service

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Technical specifications

Fuse type	MRBF
Nominal voltage	58V
Amperage	300.0
Plage de calibre de fusible compatible	30A - 300A
Pouvoir de coupure en court-circuit	10.0
Nombre de fusibles	3.0
Mounting type	Surface-mounted
Taille des goujons	8
Taille du filetage des bornes	8
Couvercle de protection inclus	Oui
Protection anti-déflagrante	Oui
IP rating	IP66
Flame retardant	Oui
Conformité ABYC	Oui
Contact material	Tinned copper
Housing material	Polycarbonate
Couple de serrage recommandé des bornes	11.3
Section de câble maximale par goujon	107.0
Dimensions (W x H x D)	156.6 x 74.5 x 50
Operating temperature range	-40°F to +176°F
Certifications	CE, UL Marine
Code-barres du produit	SK-000048265
Manufacturer part number	5193
Nombre de trous de fixation	4
Entraxe de fixation horizontal	130.2
Mounting Screw Size Imperial	#10
Taille des vis de montage (métrique)	5
Product type	Fuse block
Stud Height Mm	25.4
Terminal Stud Count	6
Terminal Stud Size Imperial	5/16"-18

Detailed description

The Blue Sea Systems MRBF Surface Mount fuse block, part number 5194-BSS, is designed for high-current circuit protection in marine installations. This device accommodates three MRBF (Marine Rated Battery Fuse) holders for independent power distribution to multiple devices.

Design and Applications

The block features three independent circuits, ideal for applications requiring separate protection for high-load devices such as bow thrusters, audio systems, or electrical panel power supplies. Unlike lower-ampere fuse blocks, the MRBF Surface Mount 5194-BSS is specifically engineered for the demanding environments of marine batteries, offering compact protection close to the power source. Its dimensions of 156.6 mm in length and 74.5 mm in width make it a space-efficient solution for direct installation on a battery or bulkhead.

Integration and Mounting

Surface mounting is facilitated by four mounting points compatible with #10 or 5 mm screws. Electrical connections are made via six 5/16"-18 studs, ensuring secure high-current capacity. The primary wiring diagram illustrates its typical use in protecting a battery charger, bow thruster, and stereo system simultaneously, each on its dedicated circuit. This approach compartmentalizes electrical risks and simplifies fault diagnosis in case of equipment failure.

Documentation

Type	Nom
	EN - Wiring Schematic - MRBF Surface Mount Fuse Block - Independent Source
	EN - Dimensioned Drawing - MRBF Surface Mount Fuse Block - Independent Source

Expert opinion

Pol CONIN

Digital Manager

« High-intensity protection: the essentials of the Blue Sea 5194-BSS MRBF block »

The Blue Sea Systems MRBF Surface Mount 5194-BSS fuse block provides a technical solution for protecting high-current circuits aboard vessels. Its key feature is the ability to accommodate three MRBF fuses, each dedicated to an independent power source, distinguishing it from traditional fuse blocks designed for lower-power applications or shared circuits. This configuration is particularly relevant for installations where multiple critical equipment items (thrusters, converters, electric winches) require individual and source-proximate protection, typically near the service battery.

This block is installed directly on the battery terminal or on a bulkhead adjacent to the battery bank, minimizing the length of unprotected cables and reducing fire risks in the event of a short circuit. The 5/16"-18 studs provide a contact surface and mechanical robustness suitable for high currents. Although a passive component, its role is fundamental to the safety and reliability of the overall electrical system. It is imperative to select the appropriate MRBF fuses based on the maximum amperage of each circuit to ensure effective protection without nuisance tripping. This model is ideal for equipped cruising sailboats, motorboats, or catamarans with multiple high-current loads.

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MRBF surface-mount fuse block - Independent source

$68.83 USD

$68.83 USD ~~$82.90 USD~~

Frequently Asked Questions

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What is an MRBF fuse block and what is it used for?

The MRBF (Marine Rated Battery Fuse) fuse block is a device designed to protect high-current electrical circuits in marine environments. It allows MRBF fuses to be installed directly on the battery terminal or very close to the power source, providing compact and effective overcurrent protection for high-power equipment.

Which types of fuses are compatible with this fuse block?

This block is specifically designed for use with MRBF (Marine Rated Battery Fuse) type fuses. It is not compatible with other fuse types.

How is this fuse block installed?

This fuse block is designed for surface mounting. It features four mounting points compatible with #10 screws or 5 mm screws. It can be installed directly on a battery or a bulkhead, depending on your installation requirements.

How many independent circuits can this fuse block protect?

This fuse block model provides protection for three independent circuits. Each circuit is powered separately and protected by its own MRBF fuse, which is ideal for isolating and protecting different high-load devices in your electrical system.

What is the maximum voltage supported by this fuse block?

The MRBF Surface Mount fuse block is designed to operate with electrical systems up to 58V DC. The actual operating voltage will depend on the specific MRBF fuses you install.

What are the exact dimensions of this fuse block?

The dimensions of this fuse block are 156.6 mm in length and 74.5 mm in width. These compact dimensions allow installation in tight spaces on your boat.

What types of electrical connections are available on this block?

Electrical connections on this fuse block are made via six 5/16"-18 studs. These robust studs ensure a secure connection and high current capacity for your power cables.

For which applications is this fuse block particularly suited?

This block is ideal for protecting high-current circuits in marine installations. It is particularly suited for heavy loads requiring separate protection, such as bow thrusters, powerful audio systems, battery chargers, windlasses, or the main power supply of an electrical panel.