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Blue Sea Systems 7721 MEGA/AMG Safety Fuse Block 300A

Manufacturer

Blue Sea Systems

<p>When electrical reliability can mean the difference between a successful voyage and a dangerous situation, marine professionals and enthusiasts turn to Blue Sea Systems. Founded in 1992, this American manufacturer has built a reputation for creating electrical components specifically engineered to withstand the unforgiving marine environment. Every product reflects a commitment to safety standards and real-world performance that has made Blue Sea Systems a leading name in marine and specialty vehicle electrical systems.</p> <h3>Engineering for the Marine Environment</h3> <p>Blue Sea Systems develops and manufactures dependable AC and DC electrical products for marine and specialized vehicle applications, designed in the USA and engineered to excel in challenging environments. The marine environment presents unique challenges—salt spray, constant vibration, temperature extremes, and moisture exposure—that can quickly degrade inferior electrical components. Blue Sea Systems addresses these challenges through careful material selection, rigorous testing protocols, and designs that prioritize both safety and serviceability. Their components are engineered for marine use and align with the intent of ABYC E-11: AC and DC Electrical Systems on Boats and relevant USCG electrical regulations.</p> <h3>Commitment to Safety Standards</h3> <p>Safety standards aren't just guidelines for Blue Sea Systems—they're fundamental to every product design. All Blue Sea Systems marine battery disconnect switches comply with the ABYC C-7 certification, demonstrating their commitment to meeting and exceeding industry safety requirements. The company maintains ABYC-certified employees across multiple departments, from engineering to technical support, ensuring deep expertise in marine electrical system design and installation standards.</p> <h3>Comprehensive Product Range</h3> <p>Blue Sea Systems offers an extensive catalog designed to address every aspect of marine electrical systems. Their <a href="/7262-blue-sea-systems-circuit-breakers-200260">circuit breakers</a> provide resettable overcurrent protection with trip-free designs and clear trip indication for quick diagnostics. For power management, their <a href="/7262-blue-sea-systems-battery-switches-manual-200149">battery switches</a> offer reliable methods for controlling battery banks and disconnecting loads during storage or emergencies, with ABYC C-7 compliance guaranteed.</p> <p>Monitoring system health is critical aboard any vessel, which is why their <a href="/7262-blue-sea-systems-battery-monitors-volt-meters-200146">battery monitors and volt meters</a> provide accurate real-time data to help operators make informed decisions about power usage and charging. The company's <a href="/7262-blue-sea-systems-terminal-blocks-bus-bars-201059">terminal blocks and bus bars</a> create organized, serviceable connection points that simplify installation and future modifications. For keeping batteries properly charged, Blue Sea Systems offers <a href="/7262-blue-sea-systems-battery-chargers-200141">battery chargers</a> engineered with features like automatic charging relay compatibility and proper charge profile management.</p> <h3>Built by Boaters, for Boaters</h3> <p>Blue Sea Systems was founded based on a commitment to create innovative high quality marine electrical products to improve the safety, simplicity, and reliability of boating, with employees who are active boaters applying their passion to designing, developing, and building products. This firsthand experience translates into practical features like modular layouts, standardized footprints, and installer-centric designs that streamline panel work and serviceability. The result is a product line that addresses real challenges faced on the water, backed by comprehensive technical documentation and support resources that help both professionals and DIY enthusiasts complete installations with confidence.</p>

Part Number

7721
06/21/2036 10:37 AM
Sale Price

$32.13

In Stock (10+)

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Usually delivered within 2 days

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No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Blue Sea Systems 7721 is an ignition-protected safety fuse block designed for high-amperage marine electrical circuits up to 300A. This robust fuse block provides critical overcurrent protection for heavy-duty applications including bow thrusters, windlasses, inverters, and battery bank distribution runs.

Key Features:

  • Accepts MEGA/AMG fuses up to 300A for high-current circuit protection
  • Ignition protected design suitable for installation in gasoline engine compartments
  • IP66 rated gasket seal protects fuse from harsh marine environment
  • Compact surface-mount design (5 1/8" L x 1 1/2" W) for flexible installation
  • Removable cover with integrated leash prevents loss and satisfies ABYC/USCG terminal insulation requirements
  • Cover features spare fuse storage compartment and space for identification labels
  • Multiple cover knock-outs allow cable entry from any direction
  • 5/16" terminal studs accommodate large gauge wire
  • 32V DC maximum voltage rating

Specifications:

  • Circuits: 1
  • Maximum Amperage: 300A
  • Maximum Voltage: 32V DC
  • Terminal Stud Size: 5/16"
  • Dimensions: 5 1/8" L x 1 1/2" W
  • Certifications: CE, IP66, ISO 8846, SAE J1171

Includes four write-on labels and is backed by Blue Sea Systems' lifetime warranty. Fuses sold separately. This model (7721) is designed for MEGA/AMG fuses; for AMI/MIDI fuse applications up to 200A, see model 7720.

Products specifications

Amps

30-300

Stud Size

M8

hope product is as nice as portrayed

So far the order seems to be fine, lets just wait for the part.

great.

great

This company is AWESOME! They had an item in stock that I could not get anywhere else and the price and shipping time was super! I will definitely use again.<br>A++++ in my book.....

Fast delivery, best price. Recommended seller

First time using Autoplicity. Found some great pricing on their site. Plan on doing plenty of mods to my new truck and would definetley recommend them and would be using them again very soon.

I entered my discount code 2offtotal and it did not remove 2% of the price. It was less than10 so not a big deal, but it would have been better if it worked.

Found what I wanted at a good price.

Excellent price on name brand items, best prices for Bosch oxygen sensors.

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