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Perko 8504DP Medium Duty Locking Battery Selector Switch with Alternator Field Disconnect

Manufacturer

Perko

<h3>A Century of American Marine Manufacturing Excellence</h3> <p>Since 1907, Perko has stood as one of America's most trusted names in marine hardware and accessories. What began in Brooklyn, New York, as a small operation crafting handmade sheet metal lanterns has evolved into a fifth-generation, family-owned manufacturer producing over 1,000 distinct marine products. Now headquartered in North Miami, Florida, Perko maintains an unwavering commitment to American craftsmanship—virtually every component, from bronze castings to chrome-plated fittings, is designed, engineered, and manufactured in-house at their expansive facility.</p> <p>Perko's reputation rests on precision manufacturing and uncompromising quality standards. The company operates its own automated foundry pouring aluminum, bronze, and stainless steel, performs decorative chrome plating and electrical contact gold plating in-house, and utilizes computerized CNC machining alongside robotic grinding. This level of vertical integration ensures consistent quality control and allows Perko to maintain ISO 9001:2015 certification while adhering to U.S. Coast Guard, UL, and National Marine Manufacturers Association standards.</p> <h3>Navigation Lighting for Every Vessel</h3> <p>For over a century, Perko has been the go-to source for marine navigation lights that meet the most stringent safety requirements. The company's <a href="/7492-perko-mastheadall-around-lights-with-removable-telescoping-bases-200666">masthead and all-around lights with removable and telescoping bases</a> represent decades of engineering refinement, offering boaters flexible mounting solutions for vessels under and over 20 meters. These combination lights integrate U.S. Coast Guard-certified masthead and all-around functionality in single, space-saving housings with fold-down adjustable angles and durable polymer construction. Perko has recently updated many navigation light models to meet ABYC C-5 LED standards, incorporating energy-efficient LED technology while maintaining the precise beam angles and visibility distances required by maritime regulations.</p> <h3>Premium Fishing Equipment Built for Serious Anglers</h3> <p>Understanding that anglers demand durability and versatility from their deck hardware, Perko manufactures an extensive line of <a href="/7492-perko-flush-mount-rod-holders-200429">flush mount rod holders</a> designed to withstand harsh marine environments. Available in both vertical and 65-degree angled configurations, these rod holders feature chrome-plated bronze or zinc alloy flanges paired with stainless steel or anodized aluminum tubes. The soft black liners protect expensive rods and reels, while integral flip-up caps and gaskets keep saltwater out when holders aren't in use. Perko's proprietary Marinium alloy—an exceptionally high-strength, corrosion-resistant material—is available on select models for the ultimate in longevity.</p> <h3>Complete Marine Systems and Hardware Solutions</h3> <p>Beyond lighting and fishing equipment, Perko's catalog spans virtually every marine hardware category. Their battery switches and electrical components are renowned for reliability in demanding saltwater applications. The company's underwater hardware—including bronze seacocks, thru-hulls, and intake strainers—is engineered to perform flawlessly below the waterline. Perko also manufactures fuel system components including EPA-compliant carbon canisters and specialized valves to help builders meet modern diurnal emissions regulations. Deck hardware such as cleats, chocks, locks, latches, and ventilators round out a product line that has served recreational boaters, commercial vessel operators, and military applications for generations.</p> <p>Every Perko product carries the company's time-tested motto: "We Make it Right, Right Here!" This commitment to domestic manufacturing and superior engineering has made Perko an essential brand for anyone who demands the best for their vessel.</p>

Part Number

8504DP
06/01/2036 10:20 AM
Sale Price

$95.77

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Product Details

The Perko 8504DP is a medium-duty battery selector switch designed for marine electrical systems, featuring an integrated locking mechanism and alternator field disconnect protection. This essential marine electrical component allows you to manage power distribution between multiple battery banks while protecting your alternator from damage.

Key Features:

  • Locking design prevents unauthorized switching while engine is running
  • Alternator field disconnect interrupts field current when switched to OFF position with engine running, protecting non-unitized alternators from damage
  • Durable polycarbonate body with brass terminals for corrosion resistance
  • Ignition protected design meets marine safety standards
  • Compatible with 6 to 32 volt marine electrical systems
  • 250 amp continuous capacity, 360 amp intermittent rating for 5 minutes

Specifications:

  • Mounting diameter: 5-1/4 inches
  • Panel depth behind mounting surface: 2-5/8 inches
  • Terminal stud size: 5/16 inch
  • Four position selector: OFF, Battery 1, BOTH, Battery 2

Ideal for boats with dual battery systems, this switch allows you to isolate batteries for starting, combine them for heavy loads, or disconnect all power when the vessel is not in use. The alternator field disconnect feature is particularly valuable for older marine charging systems with non-unitized alternators.

Good so far. Just hoping the product is of quality and that it works.

Good quick checkout.

Easy transaction

Searching for parts and ordering was quick and easy. All parts were in stock.

great price

Shipping is high but I need the product.

thanks hope it fits

Quick and easy thanks!

Autoplicty had the best price by far for a transmission. Fast shipping too!<br>UNFORTUNATELY...FED-EX beat the hell out of it! It was hanging out of the box when it arrived but was not damaged other than a few scrapes. Fed-Ex is not the best way to ship 140lbs...they can't lift it! Oh, and they can't comprehend "this side up" either!

Great company. Had part in stock ready to ship

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