Rule Rule-A-Matic® Plus Float Switch w/Fuse Holder

The Rule Rule-A-Matic® Plus Float Switch with Fuse Holder is a rugged, dependable bilge pump controller designed for marine vessels that require automatic water removal. This float switch model 40FA combines an impact-resistant integrated cover with 14-gauge marine-grade wire to deliver reliable pump activation in demanding saltwater and freshwater environments. Engineered to handle pumps drawing up to 20 amps, it's the standard choice for boat owners and commercial operators who need unattended bilge management.

The float switch features a built-in test button that allows operators to verify pump functionality without waiting for water to accumulate in the bilge. Its fully integrated cover design protects the sensitive float mechanism from debris, rope fibers, and sediment—common culprits that jam mechanical switches and cause failures at sea. The highly abrasion-resistant 14-gauge wire resists corrosion from salt spray and moisture, extending service life in harsh marine conditions. A fuse holder is integrated directly into the unit, consolidating electrical protection without requiring additional panel space or wiring.

This float switch is built for weekend anglers running small center consoles, cruising sailboat owners, and commercial fishing operations alike. Whether operating in brackish bayous, offshore saltwater, or freshwater lakes, the Rule-A-Matic Plus handles the constant duty cycle that keeps bilges dry. Its 20-amp capacity covers most standard 12-volt and 24-volt submersible pump installations found on vessels up to 40 feet. The 2-year manufacturer warranty reflects Rule's confidence in this design.