MRBF Terminal Fuse - 300A - MRBF Terminal Fuse - 300A

MRBF Terminal Fuse - 300A - Dimension Drawing

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Blue Sea Systems

5190-BSS

MRBF terminal fuse - 300 A

Designed for protecting high-current circuits, the Blue Sea MRBF 300A terminal fuse (reference 5190-BSS) provides essential electrical safety in marine installations. This Marine Rated Battery Fuse offers fast overload cutoff and installs directly on battery terminals for compact and efficient protection. It is a standalone component with no accessories included.

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£14.67 GBP

£14.67 GBP ~~£16.88 GBP~~

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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

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Support service

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Technical specifications

Fuse type	MRBF
Amperage	300.0
Nombre de fusibles	1.0
Mounting type	At dock
Taille des goujons	M8
Taille du filetage des bornes	M8
Fuse included	Oui
Protection anti-déflagrante	Oui
Flame retardant	Oui
Conformité ABYC	Oui
Contact material	Tinned copper
Couple de serrage recommandé des bornes	7.9
Operating temperature range	-40°F to +185°F
Certifications	CE, ABYC
Application Environment	Mariner
Compact Design Benefit	Reduces clutter and simplifies wiring
Corrosion resistance	Yes
Electrical Protection Type	Overload and short-circuit protection
Electrical Safety Standard	ABYC
Overload protection	Yes
Product Purpose Electrical	High-current circuit protection
Product range	MRBF
Product type	Fuse
Compatibilité tension système	12V, 24V
Vibration resistance	Yes

Detailed description

Designed for high-current circuit protection in marine environments, the Blue Sea MRBF 300A terminal fuse (part number 5190-BSS) provides a compact and efficient solution. This MRBF (Marine Rated Battery Fuse) type fuse is specifically sized for direct mounting on battery terminals or MRBF distribution blocks, minimizing unprotected cable length and the risk of electrical fire.

Optimized protection and integration

Compared to ANL or MIDI fuses, the MRBF format allows for installation closer to the power source, reducing clutter and simplifying wiring for applications such as inverters, bow thrusters, or windlasses. The Blue Sea MRBF 300A fuse provides rapid interruption in case of overload, protecting the entire vessel’s electrical system from potential damage. It integrates into 12V or 24V boat electrical systems.

Reliability and marine standards

The Blue Sea MRBF fuse design meets the requirements of marine environments, where resistance to corrosion and vibration is critical. This type of fuse is an essential component for compliance with onboard electrical safety standards, providing reliable protection for main circuits or high-ampacity specific loads. Blue Sea’s MRBF range is recognized for delivering robust protection in a compact format.

Documentation

Type	Nom
	EN - Full Scale Fuse Comparison (scaled 1 - 1) - MRBF Terminal Fuse - 300A

Expert opinion

Pol CONIN

Digital Manager

« Battery terminal protection with MRBF 300A fuse: selection and installation »

The Blue Sea MRBF (Marine Rated Battery Fuse) terminal fuse, particularly the 300A model, is a technically sound solution for protecting main circuits in marine installations. Its design allows direct mounting on the battery post, minimizing the length of unprotected cable between the power source and the protection—a critical factor for fire safety and compliance with ABYC standards. This approach is preferable to using remote inline fuse holders, which increase the length of unprotected cable.

This type of fuse is particularly well-suited for protecting high-current loads such as high-power inverters, bow thrusters, windlasses, or premium audio systems. Unlike ANL or MIDI fuses, which often require a separate fuse block and longer cables, the MRBF offers a compact footprint, freeing up space in often cramped battery compartments. It is essential to ensure the MRBF fuse rating is correctly matched to the cable cross-section it protects and the maximum current of the powered device. The fuse holder must also be compatible with the fuse rating used. For optimal installation, ensure adequate tightening of connections to minimize resistance and heat generation.

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MRBF terminal fuse - 300 A

£14.67 GBP

£14.67 GBP ~~£16.88 GBP~~

Frequently Asked Questions

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What is an MRBF terminal fuse and what is its main purpose?

The Blue Sea MRBF (Marine Rated Battery Fuse) terminal fuse, part number 5190-BSS, is a protection device designed specifically for high-current circuits in marine environments. Its primary role is to provide rapid interruption in the event of an electrical overload, thereby protecting the entire vessel's electrical system from potential damage and minimizing fire risks.

What is the particularity of installing an MRBF fuse compared to ANL or MIDI fuses?

Unlike ANL or MIDI fuses, the MRBF fuse is designed for direct installation on battery terminals or dedicated MRBF distribution blocks. This feature minimizes the length of unprotected cables, reducing clutter, simplifying wiring, and enhancing safety by placing protection as close as possible to the power source.

Is this fuse suitable for the specific conditions of marine environments?

Yes, the Blue Sea MRBF fuse is specifically designed to meet the requirements of marine environments. Its design ensures resistance to corrosion and vibrations, which are important factors aboard a vessel. It is an essential component for compliance with electrical safety standards in marine environments.

What is the maximum current rating this fuse can handle?

This Blue Sea MRBF terminal fuse is rated for a nominal current of 300 Amperes (300A). It is designed to protect circuits requiring high amperage.

On which types of marine electrical systems is this fuse compatible?

The Blue Sea MRBF 300A terminal fuse is compatible and integrates into marine electrical systems operating at 12 Volts (12V) or 24 Volts (24V).

Where should this fuse be installed for optimal protection?

For optimal protection, the MRBF fuse must be installed directly on the battery terminals or on an MRBF distribution block. This installation close to the power source is essential to minimize the length of unprotected cables and ensure maximum safety.

For which onboard boat applications is this fuse particularly recommended?

This fuse is particularly recommended for protecting high-current circuits that power equipment such as:

InvertersBow thrustersWindlassesIt provides robust protection for these specific loads requiring high amperage.

Is the MRBF 300A fuse an essential component for electrical safety?

Yes, the Blue Sea MRBF 300A fuse is an essential component for compliance with electrical safety standards on board vessels. Its ability to provide robust and rapid protection in case of overload is critical to prevent equipment damage and fire risks associated with electrical failures.