Bloc-fusible terminal MRBF - 30 à 300 A - MRBF Terminal Fuse Block - 30 to 300A

Bloc-fusible terminal MRBF - 30 à 300 A - Mounting Diagram

Bloc-fusible terminal MRBF - 30 à 300 A - Dimensioned Drawing

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Blue Sea Systems

5191B-BSS

MRBF terminal fuse block - 30 to 300 A

The BLUE SEA MRBF terminal fuse block (30-300A, 12/24V) provides compact and reliable protection for high-current marine circuits. Designed for direct mounting on M8 battery terminals, it secures electrical installations by reducing bulk and failure points. The MRBF fuse is sold separately.

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£25.39 GBP

£25.39 GBP ~~£29.26 GBP~~

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Low 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

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Fuse type	MRBF
Nominal voltage	12/24
Amperage	300.0
Plage de calibre de fusible compatible	30-300
Pouvoir de coupure en court-circuit	10.0
Nombre de fusibles	1.0
Mounting type	Mounting on battery terminal
Taille des goujons	8
Taille du filetage des bornes	8
Couvercle de protection inclus	Oui
Protection anti-déflagrante	Oui
IP rating	IP66
Conformité ABYC	Oui
Contact material	Tinned copper
Housing material	Plastic
Couple de serrage recommandé des bornes	11.0
Dimensions (W x H x D)	63 x 47 x 21 mm
Weight	0.07
Operating temperature range	-25 to +85
Certifications	ABYC,USCG,SAE J1171,CE
Fabricant	Blue Sea Systems
Catégorie de produit niveau 0	Electrical
Product category level 1	Electrical wiring
Product category level 2	Fuses
Facteur de forme du produit	Fuse block terminal
Product range	MRBF
Product type	Fuse block
Volume Cm3	62.121

Detailed description

Designed for protecting high-current circuits in marine systems, the BLUE SEA MRBF terminal fuse block is a compact solution for applications ranging from 30 to 300 amps. This device mounts directly onto the battery terminal, eliminating the need for long fuse cables and reducing connection points for improved reliability. It is rated for 12/24V systems and uses an M8 stud for the connection.

Protection of main circuits

The MRBF (Mega/Medium Rated Bolt-down Fuse) concept differs from traditional inline fuse holders by its compact format and ability to handle high currents. Unlike ATO/ATC fuses or maxi-fuses, the MRBF is specifically designed for starter circuits, windlasses, or inverters, where 30 to 300 amp protection is required. It provides an alternative to thermal circuit breakers for primary battery protection, particularly on sailboats and powerboats with space constraints, while complying with ABYC standards for battery circuit protection.

Installation and compatibility

Installation of the BLUE SEA MRBF terminal fuse block is simplified by its design, which allows direct mounting onto the battery terminal. This approach reduces cable bulk and weight while minimizing potential voltage drops. It is compatible with 12V and 24V electrical systems, covering a wide range of recreational vessels and small workboats. For lower currents or secondary circuits, BLUE SEA offers other solutions such as ST Blade fuse blocks or resettable circuit breakers, but the MRBF remains the reference for protecting high-current main circuits.

Expert opinion

Pol CONIN

Digital Manager

« Robust protection of main marine circuits with the MRBF »

Installing a Blue Sea MRBF terminal fuse block is a technically sound decision for primary protection of service or starter batteries, as well as high-current circuits such as windlasses, bow thrusters, or inverters. Its design allows direct mounting on the battery terminal, minimizing the length of unprotected cables and reducing the risk of fire in the event of a major short circuit. This solution is particularly relevant for installations where space is limited and reliability is critical, avoiding remote fuse holders and their additional wiring.

It is critical to select the MRBF fuse rating (sold separately) to match the capacity of the cable it protects and the maximum consumption of the equipment. A common mistake is to oversize the fuse relative to the cable, thereby compromising safety. This type of block is ideal for medium to large boats requiring robust and accessible protection for main circuits. For systems with frequent disconnection or reset requirements, a thermal circuit breaker of similar capacity may be considered, but the MRBF excels in its simplicity and resistance to vibration.

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MRBF terminal fuse block - 30 to 300 A

£25.39 GBP

£25.39 GBP ~~£29.26 GBP~~

Frequently Asked Questions

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What is an MRBF terminal fuse block?

The BLUE SEA MRBF (Mega/Medium Rated Bolt-down Fuse) terminal fuse block is a high-current circuit protection device designed for marine applications. It features a compact design and direct installation on the battery terminal, reducing fuse cable lengths and connection points for improved reliability.

What is the supported amperage range for this MRBF fuse block?

This fuse block is designed to protect circuits with an amperage range from 30 to 300 amperes. It is essential to select the appropriate MRBF fuse for your circuit's amperage.

What are the advantages of using an MRBF fuse block compared to traditional fuse holders?

The main advantages of the MRBF terminal fuse block are:

Reduced footprint: Its compact design allows direct mounting on the battery terminal.Higher reliability: It minimizes connection points and reduces fuse cable length.High-current protection: It is specifically designed to handle high currents.Compliance: It meets ABYC standards for battery circuit protection.

For which marine applications is this fuse block best suited?

This fuse block is ideal for protecting high-current main circuits on vessels, particularly for:

Engine starters.Winch motors.Inverters.Primary battery protection on sailboats and powerboats where space is limited.

Is this fuse block compatible with 12V and 24V electrical systems?

Yes, the BLUE SEA MRBF terminal fuse block is compatible with 12V and 24V electrical systems, making it suitable for a wide range of recreational boats and small workboats.

What is the stud size required for the battery terminal to install this fuse block?

This fuse block is designed to be installed on a battery terminal with an M8 stud.

Which type of fuse should be used with this terminal fuse block?

This fuse block is specifically designed to be used with MRBF (Mega/Medium Rated Bolt-down Fuse) type fuses. It is essential to use only this type of fuse to ensure proper and secure protection of your circuit.

How is the MRBF terminal fuse block installed on the battery?

Installing the MRBF terminal fuse block is simplified by its design, which allows direct mounting on the battery terminal. This method reduces clutter, cable weight, and minimizes potential voltage drops by eliminating the need for long fuse cables.