Porte fusible MEGA AMG Max 300A avec couvercle - AMG® Safety Fuse Block

Porte fusible MEGA AMG Max 300A avec couvercle - Dimensioned Drawing

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Blue Sea Systems

7721B-BSS

MEGA AMG Max 300 A fuse holder with cover

The BLUE SEA SYSTEMS MEGA AMG Max 300 A (7721B-BSS) fuse block is designed for protecting high-current marine electrical circuits. Certified to ISO 8846 for gas ignition protection, it ensures the safety of critical equipment. This model, which includes a cover, is ideal for demanding current applications, offering higher capacity than the 200A (7720) version in the same range.

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31,23€

31,23€ ~~33,90€~~

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Prices shown excluding VAT for Türkiye. If your delivery address is in the European Union, the VAT of the destination country will be added at checkout.

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

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Support service

Opt for additional installation assistance

Technical specifications

Fuse type	MEGA
Amperage	300.0
Compatible fuse rating range	100-300
Number of fuses	1.0
Cover included	Oui
Ignition protection	Oui
Flame retardant	Oui
Contact material	Tinned copper
Housing material	Flame-resistant plastic
Weight	0.07
Certifications	CE, ISO 8846
Continuous current rating	300
Humidity Operating Range Percent	0-95% (no condensation)
Manufacturer name	Blue Sea Systems
Marine grade	Yes
Maximum DC voltage	58
Operating voltage range	12V - 58V DC
Product range	MEGA
Product type	Fuse holder
Storage Temperature Range C	-40°C to +85°C

Detailed description

Designed for high-current circuit protection in marine environments, the BLUE SEA SYSTEMS MEGA AMG Max 300 A fuse holder, part number 7721B-BSS, provides a solution for managing high currents. This model is intended for applications requiring protection up to 300 amperes, making it suitable for equipment such as windlasses, bow thrusters, or high-output alternators.

Protection and compliance

The 7721B-BSS fuse holder is certified under the Recreational Craft Directive 94/25/EC as amended by 2003/44/EC, in compliance with ISO 8846. This certification ensures protection against ignition of surrounding flammable gases, a critical safety criterion for onboard vessel systems. This level of protection is comparable to that of the same brand’s 7720 model, which is designed for 200-ampere currents, but the 7721B-BSS extends this capacity to 300 amperes for more demanding electrical systems.

Design and integration

The fuse holder is supplied with a cover, providing additional protection for connections and the fuse against spray and the marine environment. Its design allows for direct integration into electrical distribution systems, offering rapid circuit interruption in case of overload. Compared to less specialized solutions, this BLUE SEA SYSTEMS fuse holder is specifically tailored to the constraints of marine installations, where electrical reliability and safety are paramount.

Expert opinion

Pol CONIN

Digital Manager

« Technical analysis of the Blue Sea MEGA AMG 300A fuse holder »

Integrating a MEGA AMG fuse block is a critical step for the electrical safety of high-consumption marine installations. The Blue Sea Systems 7721B-BSS model, with its 300-amp capacity, is particularly relevant for applications such as protecting the main power supply of a windlass, bow thruster, or high-power inverter. Its ideal placement is as close as possible to the energy source, typically the service battery, to minimize the length of unprotected cable.

The ISO 8846 certification for gas ignition protection is a major asset for this component. It ensures that the fuse block will not be a source of ignition in potentially explosive environments, such as engine compartments. During installation, it is imperative to use high-quality, crimped, and insulated terminals to ensure optimal conductivity and prevent overheating at connection points. Although its installation is relatively straightforward for a marine electrician, selecting the appropriate AMG fuse (sold separately) must be rigorous, based on the maximum load and the cross-section of the protected cable. This model stands out from its 7720 counterpart (200A) due to its higher capacity, making it essential for systems requiring 300-amp protection.

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MEGA AMG Max 300 A fuse holder with cover

31,23€

31,23€ ~~33,90€~~

Frequently Asked Questions

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What is the main function of the BLUE SEA MEGA AMG Max 300 A fuse holder?

The primary function of this fuse holder is to provide essential protection for high-current electrical circuits in marine environments. It is designed to quickly interrupt the circuit in the event of an overload, thereby protecting the vessel's equipment and electrical system.

What is the maximum current rating this fuse holder can support?

This fuse holder is designed to support a maximum current of 300 amperes (300 A).

Is the fuse holder supplied with a protective cover?

Yes, this fuse holder is supplied with a cover. The cover provides additional protection for the connections and fuse against water spray and marine environmental elements.

Is this fuse holder specifically designed for marine applications?

Yes, this fuse holder is specifically designed for marine environments. Its design is suited to the constraints of nautical installations, where electrical reliability and safety are paramount.

Which types of fuses are compatible with this fuse holder?

This fuse holder is compatible with MEGA AMG type fuses.

For which typical applications is this fuse holder recommended aboard a boat?

This fuse holder is recommended for protecting high-current circuits such as those of windlasses, bow thrusters, or high-output alternators.

Is this product certified for marine safety?

Yes, this fuse holder is certified under the Recreational Craft Directive 94/25/EC, as amended by 2003/44/EC, and complies with ISO 8846.

Does the fuse holder provide protection against gas ignition?

Yes, this product is certified to provide protection against ignition of surrounding flammable gases, which is an essential safety criterion for vessels.

What is the part number (SKU) of this fuse holder?

The SKU for this product is 7721B-BSS.

What is the brand of this fuse holder?

The brand of this fuse holder is Blue Sea Systems.

What is the weight of this fuse holder?

The weight of this fuse holder is 0.07 kg.

In which country is this fuse holder manufactured?

This fuse holder is manufactured in Mexico.

Can this fuse holder be used with 12V or 24V systems?

Yes, Blue Sea Systems MEGA AMG type fuse holders and fuses are generally designed for use with marine DC electrical systems, including 12V and 24V installations, as well as higher voltages up to 32V or 58V depending on the specific fuse used. The fuse holder itself is a mounting base.

Is the fuse holder 7721B-BSS an alternative to model 7720?

The 7721B-BSS model (300 A) is an option for higher currents than the 7720 model (200 A) from the same brand. While they share similar protection features, the 7721B-BSS is designed for more demanding electrical systems requiring a 300-amp capacity.

Is specific knowledge required to install this fuse block?

Installing any marine electrical component, including a fuse holder, requires electrical knowledge. It is recommended to use a qualified professional to ensure correct and safe installation in compliance with maritime standards.

How is the fuse holder mounted or secured?

The fuse holder is designed for direct integration into electrical distribution systems. While specific mounting details are not provided, fuse holders of this type are typically secured with screws onto a flat surface.

Are installation instructions provided with the product?

The provided information does not specify whether detailed installation instructions are included. However, Blue Sea Systems products are often supplied with documentation, and resources are available on the manufacturer’s website. It is always recommended to consult a professional for installation.

What is the difference between this model and the Blue Sea Systems 7720 model?

The main difference lies in the maximum supported current. The 7721B-BSS model can handle up to 300 amperes, while the 7720 model is designed for currents up to 200 amperes. Both models offer similar protection against gas ignition and are certified to the same standards.

Can this fuse holder be used in non-marine environments?

Although specifically designed and certified for marine environments due to its safety and robustness requirements (gas ignition protection, resistance to splashes), it could potentially be used in other high-current DC applications requiring similar protection, provided that the technical specifications and safety standards for the relevant application are met.