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Blue Sea Systems 8521 Waterproof 5-Position Circuit Breaker Panel with Dual USB Charger

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

8521
06/01/2036 3:02 PM
Sale Price

$234.82

3 left at this price

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Usually delivered within 2 days

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FREE SHIPPING

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No Hassle Returns

No Hassle Returns

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Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Blue Sea Systems 8521 is a waterproof 5-position Contura switch panel with integrated dual USB chargers, designed specifically for open-cockpit and flybridge marine applications. This versatile panel provides convenient control and charging capabilities in exposed marine environments where weather resistance is essential.

Key Features:

  • Five Contura-style rocker switches with illuminated ON indicator LEDs for clear status visibility
  • Integrated 12/24V DC dual USB charger delivering 4.8A total output with intelligent device recognition for optimized charging
  • Weather-resistant design with watertight mounting gasket for reliable performance in harsh marine conditions
  • Compatible with both 12V and 24V DC electrical systems
  • Each switch rated for 20A at 12V DC or 15A at 24V DC
  • Low operating current of just 18mA per switch

Technical Specifications:

  • Nominal Voltage: 12/24V DC
  • Switch Rating: 20A @ 12V DC, 15A @ 24V DC
  • USB Output: 4.8A total (dual port)
  • Operating Current: 18mA per switch
  • Dimensions: 7.5" H x 4.5" W x 3.25" D (190.5 x 133.35 x 76.2mm)

Package Includes:

  • 8521 switch panel
  • Switch labels
  • Mounting hardware
  • Watertight mounting gasket

This panel is ideal for controlling navigation lights, pumps, electronics, and other onboard systems while providing modern USB charging capability for smartphones, tablets, and other mobile devices.

fast delivery, wish to get discount i forgot to place order for missing poles.

Super fast delivery. Great first impression.

Very satisfied

Great

Very easy

Had the best price for the part I needed. Arrived in 2 days so just as fast as Amazon. Very satisfied with everything.

Kool

My order was shipped and received in a timely manner. The part I ordered was an exact match to the part I was replacing.

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