MRBF Terminal Fuse - 125A - Dimension Drawing

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Blue Sea Systems

5184-BSS

MRBF terminal fuse - 125 A

Designed for protecting high-current circuits, the Blue Sea MRBF 125A terminal fuse provides a compact and secure solution. It mounts directly on the battery terminal, minimizing cable lengths and risks. This fuse is an essential component for marine electrical installations requiring reliable protection up to 125 amperes.

Price excl. import taxesBenefit from the professional rate

$18.00 USD

$18.00 USD ~~$22.00 USD~~

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Prices exclude import taxes. DAP delivery: import taxes are paid on delivery.

Available 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

Find an installer

Support service

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Technical specifications

Fuse type	MRBF
Nominal voltage	58
Amperage	125.0
Compatible fuse rating range	30 to 300 A
Short-circuit breaking capacity	10.0
Number of fuses	1.0
Mounting type	At dock station
Stud size (mm)	8
Terminal thread size (mm)	8
Fuse included	Oui
Ignition protection	Oui
IP rating	IP66
Flame retardant	Oui
ABYC compliance	Oui
Contact material	Tinned copper
Housing material	Thermoplastic polymer
Recommended terminal torque (Nm)	11.3
Dimensions (W x H x D)	27.8 x 16.3 x 23.0 mm
Weight	0.025
Operating temperature range	-40 to +85
Certifications	CE,UL
Electrical Protection Type	Overcurrent protection
Installation Benefit Cable Reduction	Reduces the length of unprotected cables
Installation method	Directly on battery post
Intended use	Protection for high-current marine electrical circuits
Maintenance Ease	Easy replacement
Product application environment	Marine
Product type	Fuse
Net weight of the product	25
Protected Equipment Types	DC-DC converters, bow thrusters, windlasses
Terminal type	Dowel

Detailed description

The Blue Sea MRBF 125A terminal fuse is a protection solution for high-current marine electrical circuits. Designed for direct installation on the battery terminal, it secures high-power equipment such as inverters, bow thrusters, or windlasses.

Protection and integration

Unlike classic inline fuses requiring separate fuse holders, the MRBF (Marine Rated Battery Fuse) concept integrates the fuse directly onto the terminal. This design optimizes space, reduces the length of unprotected cables, and simplifies wiring. Its 125-amp capacity makes it suitable for medium to high-power applications, offering a compact alternative to bulkier ANL or blade-type fuses for similar current ratings.

Marine installation safety

This type of fuse is an essential safety component, preventing overcurrents that could damage equipment or, in the worst case, cause fires. In the event of overload or short circuit, the MRBF 125A fuse interrupts the circuit, protecting the entire electrical system and connected devices. It is easily replaceable, ensuring quick and efficient maintenance at sea.

Documentation

Type	Nom
	EN - Comparatif fusibles échelle 1:1 - fusible terminal MRBF 125 A

Expert opinion

Pol CONIN

Digital Manager

« High-intensity protection for battery terminal »

Blue Sea's MRBF terminal fuse, particularly the 125A model, is a technically sound choice for protecting main circuits in modern marine installations. Its primary advantage lies in its design, which allows direct mounting on the battery terminal. This architecture minimizes the length of unprotected cable between the power source and the fuse point, a fundamental requirement in marine electrical safety to reduce fire risk in the event of an upstream short circuit.

This type of fuse is ideal for applications requiring high current protection in confined spaces, such as powering a mid-sized 12V/230V inverter, a compact bow thruster, or a windlass. It offers a more compact and often easier-to-integrate alternative to ANL or MIDI fuse holders for similar current ratings, while providing reliable protection. During installation, it is critical to ensure proper tightening of connections to avoid excessive resistance and overheating.

It is less suitable for very low-current circuits or applications requiring integrated multi-circuit breaking, where fuse blocks or more complex circuit breakers would be preferable. For currents exceeding 200-300A, other solutions such as ANL fuses or specific circuit breakers may be considered, but for the 50A to 200A range, the MRBF is often an optimal solution in terms of space and safety.

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MRBF terminal fuse - 125 A

$18.00 USD

$18.00 USD ~~$22.00 USD~~

Frequently Asked Questions

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What is an MRBF terminal fuse?

MRBF stands for 'Marine Rated Battery Fuse'. It is a type of fuse designed specifically for marine applications, installed directly on the battery terminal. This design provides compact and effective protection for high-current circuits, reducing the length of unprotected wiring and simplifying the wiring layout.

What is the nominal rating of this fuse?

This Blue Sea MRBF terminal fuse has a rated current of 125 amperes (125A).

For which types of marine equipment is this fuse recommended?

This fuse is ideal for protecting high-power marine equipment such as inverters, bow thrusters, windlasses, and other devices requiring overcurrent protection.

What are the advantages of the MRBF fuse compared to other types of marine fuses?

The MRBF fuse offers several key advantages:

Reduced footprint: It installs directly on the battery terminal, eliminating the need for a separate fuse holder and optimizing space.Improved safety: It reduces the length of unprotected cables between the battery and the fuse.Simplified installation: Its integrated design simplifies wiring.High-current protection: It provides reliable protection for high currents in a compact format, acting as an alternative to bulkier ANL or blade fuses.

Is this fuse ignition-protected?

Yes, Blue Sea Systems MRBF fuses are designed to be ignition-protected, meaning they are suitable for use in engine compartments where flammable vapors may be present, in accordance with marine safety standards.

What is the maximum voltage rating supported by this fuse?

This MRBF terminal fuse is designed for marine electrical systems and can handle a maximum voltage of 58V DC.

What is the interrupting rating (AIC) of this fuse?

The interrupting rating (AIC - Amps Interrupting Capacity) of this MRBF fuse varies depending on the system voltage:

10,000 amperes (10kA) at 14V DC
5,000 amperes (5kA) at 32V DC
2,000 amperes (2kA) at 58V DC
This high rating ensures effective protection in the event of a short circuit.