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Sierra BS11040 Voltage Sensitive Relay 12V 125A Battery Combiner

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

BS11040
06/03/2036 6:29 AM
Sale Price

$80.86

In Stock (7)

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Product Details

The Sierra BS11040 Voltage Sensitive Relay is an intelligent battery management solution designed to automatically combine and isolate dual battery systems in marine, RV, and powersports applications. This relay eliminates the voltage drop associated with traditional diode-based battery isolators while protecting your starting battery from being drained by accessory loads.

Key Features:

  • Automatic battery combining at 13.3VDC when charging, isolation at 12.8VDC when not charging
  • 125A continuous current rating with 140A intermittent capacity
  • Zero voltage drop operation—maintains full charging voltage to both batteries unlike diode isolators (0.6V drop)
  • 12VDC nominal voltage operation
  • Low power consumption: 10mA standby, 330mA when engaged, 0mA in storage mode
  • Durable glass fiber reinforced nylon enclosure for harsh marine and outdoor environments

This voltage sensitive relay automatically monitors battery voltage and connects batteries when the alternator or charger is running, allowing both batteries to charge simultaneously. When charging stops, it isolates the batteries to ensure your starting battery remains fully charged. Ideal for boats, RVs, and vehicles with dual battery systems requiring reliable auxiliary power without compromising starting capability.

good

Very good prices for quality parts!

real fine

kwik and easy

Order process is VERY user friendly!

Good rate and price

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