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Rule Industries 37FA SuperSwitch Marine Float Switch with Fuse Holder

Manufacturer

Rule Industries

<h3>Rule Industries: Five Decades of Marine Pumping Excellence</h3> <p>Since 1965, Rule Industries has been a trusted name in marine solutions, setting the industry standard with high-performance submersible bilge pumps. As part of Xylem's portfolio of water technology brands, Rule has built an exceptional reputation among commercial fishermen, recreational boaters, and marine professionals who demand equipment that performs when it matters most. As marine technology developed, Rule stayed ahead, delivering pump systems that became the go-to choice for commercial fishermen and recreational boaters alike.</p> <p>Every boat owner faces the same challenge: water intrusion is inevitable. Whether from rain, splash-over, or slow leaks, managing bilge water is critical to vessel safety and longevity. That's where Rule's engineering expertise becomes essential. Rule pumps have built their reputation in the field—through storms, mechanical failures, and those high-pressure situations where reliable water removal is the difference between a close call and a catastrophe.</p> <h3>Comprehensive Marine Water Management Solutions</h3> <p>Rule's product lineup centers on one core mission: keeping vessels dry and operational in any condition. Their <a href="/6623-rule-industries-electric-bilge-pumps-200350">electric bilge pumps</a> form the foundation of this commitment, offering flow rates from 360 GPH to over 3800 GPH to match any vessel size and water accumulation challenge. These pumps feature marine-grade construction designed to withstand salt spray, temperature extremes, and constant moisture exposure that would quickly destroy lesser equipment.</p> <p>Understanding that automation is key to peace of mind on the water, Rule offers multiple control solutions. Their <a href="/6623-rule-industries-float-switches-200426">float switches</a> provide reliable automatic activation when water levels rise, eliminating the need for constant monitoring. For comprehensive vessel protection, Rule's <a href="/6623-rule-industries-bilge-pump-switches-alarms-200163">bilge pump switches and alarms</a> deliver layered safety systems that alert operators to water intrusion while automatically managing removal. Rule Automatic Bilge Pumps feature built-in sensors that check for water every 2.5 minutes, ensuring continuous protection without manual intervention.</p> <p>Beyond bilge management, Rule provides specialized solutions for other marine applications. Their <a href="/6623-rule-industries-air-pumps-adaptors-200078">air pumps and adaptors</a> support livewell systems critical for fishing operations, while their extensive range of <a href="/6623-rule-industries-plumbing-parts-accessories-200786">plumbing parts and accessories</a> ensures that complete fluid management systems can be built, maintained, and upgraded using Rule components.</p> <h3>Engineering That Stands Up to Marine Environments</h3> <p>Rule's commitment to quality and durability makes their pumps the first choice among do-it-yourselfers and professional installers alike. The brand's pumps undergo rigorous testing to ensure they deliver rated flow rates even under challenging conditions. Their cartridge-style pump designs allow for easy maintenance—when debris clogs the strainer or impeller, the motor cartridge can be quickly removed for cleaning and reinstalled, minimizing downtime.</p> <p>High-quality materials handle salt spray, temperature swings, and constant moisture without breaking down, designed to keep working in conditions that destroy lesser equipment. This durability translates to real-world reliability for boaters who need equipment they can count on when far from shore, facing rough seas, or leaving their vessels unattended.</p> <h3>Why Marine Professionals Choose Rule</h3> <p>Rule's position in the marine industry reflects decades of proven performance. The brand's pumps are specified by boat manufacturers, recommended by marine technicians, and chosen by vessel owners who understand that bilge pump failure isn't just an inconvenience—it's a serious safety risk. From small recreational craft to larger commercial vessels, Rule provides scalable solutions backed by widespread availability through marine dealers and distributors worldwide.</p> <p>Whether you're replacing a worn pump, upgrading to automatic operation, or building a new vessel, Rule Industries delivers the marine pumping technology that keeps boats dry, protected, and ready for whatever conditions they encounter on the water.</p>

Part Number

37FA
06/27/2036 1:10 PM
Sale Price

$72.91

In Stock (10+)

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Usually delivered within 2 days

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Fitment guaranteed

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Product Details

The Rule Industries 37FA SuperSwitch is a heavy-duty, non-mercury marine bilge pump float switch built for the most demanding marine applications. Featuring an integrated waterproof in-line fuse holder, the 37FA eliminates the need to add a separate fuse to the positive battery lead — protecting both the pump and switch from damage in the event of an electrical fault.

Automatic Bilge Pump Control: This switch automatically activates the bilge pump when water rises to 2" (51mm) and shuts it off when the level drops back to 3/4" (19mm). It can also be used to trigger high-water alarm systems.

Key Features:

  • Mercury-free design — environmentally responsible and safe for all marine environments
  • Marine-grade 14-gauge blocked wire — tinned and gasketed leads for superior corrosion resistance and moisture prevention
  • Larger float for increased buoyancy and reliable water-level sensing
  • Snap-action switch — tested to over 1,000,000 cycles at 12V for long-lasting reliability
  • Removable base for easy cleaning and servicing without full removal
  • Integrated waterproof in-line fuse holder — protects pump and switch from electrical faults
  • Compatible with pumps drawing up to 20 Amps
  • Multi-voltage compatible — works with 12V, 24V, and 32V DC systems
  • Exclusive moisture-tight seals for reliable submersible performance
  • Backed by a 5-year limited warranty

The Rule 37FA SuperSwitch is ideal for bilge pump automation in boats, sailboats, and other marine vessels where dependable, maintenance-friendly float switch performance is essential.

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The whole experience was so much fun

Thank you for the prompt delivery

All good. Got order quickly and had decent tracking

Fast free shipping!

No reply to my email with question about the part fitting my vehicle. Since the mfg part # matched I took a chance and ordered.

easy to navagate site

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