Rule Industries 35FA Rule-A-Matic Bilge Pump Float Switch with Fuse Holder

The Rule Industries 35FA Rule-A-Matic Float Switch is the world's most trusted automatic bilge pump float switch, relied upon by recreational boaters and commercial fishermen alike. Designed for automatic on/off bilge pump control, it activates the pump when water rises to 2" (51mm) and shuts the pump off once the level drops to 3/4" (19mm), helping to keep your bilge dry without manual intervention. This model includes an integrated inline fuse holder on the positive wire, protecting both the switch and pump from electrical damage in the event of a fault.

Key Features:

• Mercury-free snap switch using Silver Tin Oxide contacts, tested to over one million cycles for long-term reliability
• Removable base with convenient snap-in design for easy cleaning, inspection, and servicing
• Extra-large float chamber for increased buoyancy and consistent water level detection
• Integrated waterproof inline fuse holder — no need to add a separate fuse to the battery positive wire
• Marine-grade "blocked" wire leads with tinned conductors and sealed exits to prevent water intrusion and resist corrosion
• Rubber grommet strain relief where wiring exits the body, keeping connections dry
• Switch design prevents rapid on/off cycling to protect the bilge pump motor
• Compatible with pumps drawing up to 14 amps
• Operates on 12V, 24V, or 36V DC systems
• Can also be used to trigger high-water alarm systems
• Backed by a 2-year limited warranty

The Rule 35FA is a dependable, environmentally responsible upgrade over older mercury-based switches, making it the go-to automatic bilge float switch for freshwater and saltwater vessels of all sizes.