Shurflo Caged Automatic Bilge Pump Switch 359-111-40, 12/24V Non-Mercury Float Switch

The Shurflo Caged Automatic Bilge Pump Switch (359-111-40) is a non-mercury mechanical float switch built to automatically activate and deactivate your boat's bilge pump as water levels rise and fall. It turns on when water reaches 1-3/4 inches and shuts off once the level drops to 3/4 inch, giving reliable, hands-free bilge water evacuation without constant monitoring. A protective cage shields the float mechanism from debris that could otherwise interfere with its operation, making it well suited to harsh marine bilge environments.

Installation is straightforward thanks to an easy snap-into base design that supports either remote or direct mounting, along with a 3 inch tinned wire assembly for making electrical connections. A manual test feature lets you verify pump operation on demand without waiting for water to reach the trip point. For maximum performance, mount the switch horizontally. The switch is ignition protected and rated for 12/24 VDC systems, drawing up to 12 amps at 12 volts DC or 6 amps at 24 volts DC, and it operates across a temperature range of 33 degrees F to 180 degrees F. Its snap-in baseplate is designed to work with SHURFLO 380, 500, 700, and 1000 GPH bilge pumps. Backed by a 3 year manufacturer's warranty, this switch is a durable, drop-in solution for automating bilge pump control on boats of all sizes.

Specifications

• Brand: Shurflo
• Manufacturer Part Number: 359-111-40
• Type: Float Switch
• Voltage: 12/24 VDC
• Max Amperage: 12 Amps at 12 Volt DC / 6 Amps at 24 Volt DC
• Activation Level: 1-3/4 inches
• Deactivation Level: 3/4 inch
• Operating Temperature Range: 33 degrees F to 180 degrees F
• Wire Assembly Length: 3 inches
• Mounting: Remote or direct mounting, snap-in base
• Box Dimensions: 4 inches H x 7 inches W x 9 inches L
• Weight: 0.64375 pounds
• Material: Acrylonitrile Butadiene Styrene (ABS), Metal
• Mercury Content: Non-mercury
• Certifications: Ignition protected, CE approved
• Compatible Pump Models: SHURFLO 380, 500, 700, and 1000 GPH bilge pumps
• Warranty: 3 year manufacturer's warranty
• UPC: 752324010622

Fitment

Snap-in baseplate fits SHURFLO 380, 500, 700, and 1000 GPH bilge pumps.

Replaces (OEM)

No OEM cross-reference numbers are listed for this part.

Frequently Asked Questions

At what water level does the Shurflo 359-111-40 switch turn the bilge pump on and off? The Shurflo Caged Automatic Bilge Pump Switch (359-111-40) activates when water reaches 1-3/4 inches and deactivates once the level falls to 3/4 inch.

Does this switch contain mercury? No, the 359-111-40 is a non-mercury mechanical float switch, making it a safer and more environmentally friendly option for bilge control.

Can this switch be manually tested? Yes, the Shurflo 359-111-40 includes a manual test feature so you can verify pump operation without waiting for the bilge to fill to the activation level.

How should this bilge pump switch be mounted? For maximum performance, the Shurflo 359-111-40 should be mounted horizontally, and it supports either remote or direct mounting via its snap-into base design.

What is the wire length on this switch? This switch comes with a 3 inch tinned wire assembly for making electrical connections.

What voltage and amperage does the 359-111-40 support? The Shurflo Caged Automatic Bilge Pump Switch operates at 12/24 VDC, drawing up to 12 amps at 12 volts DC or 6 amps at 24 volts DC.

What pumps is this switch compatible with? The snap-in baseplate on the Shurflo 359-111-40 is designed to fit SHURFLO 380, 500, 700, and 1000 GPH bilge pumps.

What operating temperature range is this switch rated for? The 359-111-40 is rated to operate between 33 degrees F and 180 degrees F.

Is this switch ignition protected? Yes, the Shurflo Caged Automatic Bilge Pump Switch is ignition protected and CE approved for marine use.

How much does this bilge pump switch weigh? The Shurflo 359-111-40 weighs 0.64375 pounds.

What is the difference between this switch and a standard, uncaged float switch? The 359-111-40 is the caged version, featuring a protective cage around the float mechanism to shield it from debris in the bilge, along with a manual test feature and easy snap-into base design.

What warranty comes with this part? The Shurflo 359-111-40 is backed by a 3 year manufacturer's warranty.