Attwood Bilge Switch S3 Series - 12V

The Attwood Bilge Switch S3 Series - 12V is an automatic bilge pump control system engineered for vessels that demand reliable water management without constant monitoring. Designed for freshwater and saltwater environments alike, this switch serves as the critical link between your bilge pump and the water accumulating in your hull—automatically activating your pump only when needed. Whether you're running a center console, trawler, sailboat, or commercial fishing vessel, this switch eliminates the guesswork and human error that can lead to water damage, electrical failure, or dangerous vessel instability.

At the heart of the S3 Series lies proprietary electronic sensing technology that continuously monitors bilge water levels with precision and consistency. Unlike mechanical float switches prone to fouling in debris-laden bilge water, this electronic approach triggers pump activation reliably across any bilge water mixture—fuel-contaminated, oil-laden, or sediment-heavy—without failure or false cycling. The 12V DC design integrates seamlessly with standard marine electrical systems and operates silently, protecting your pump from dry-running and extending equipment lifespan while minimizing battery drain during idle periods.

Professional captains, charter operators, and serious recreational boaters trust the Attwood Bilge Switch S3 Series for overnight anchorages, rough seas, and extended offshore operations where unattended bilge management is non-negotiable. Installation requires basic marine wiring skills and compatible with most 12-volt bilge pump systems found on modern vessels. Compact dimensions (3 x 2 x 7 inches) and minimal weight (0.4 lbs) make mounting straightforward in tight engine compartments. For boaters who value peace of mind and equipment protection, this switch delivers automation that works as hard as you do on the water.