Sea-Dog SPDT On/Off/On Toggle Switch, 15 Amp 12 Volt Waterproof Marine Switch

This Sea-Dog toggle switch is a water resistant SPDT On/Off/On switch built for marine electrical panels where reliable, corrosion-resistant switching is required. The three-position action lets you control two separate circuits from a single switch, or reverse a motor or accessory, making it a common choice for bilge pumps, trim tabs, navigation lights, and other 12 volt onboard equipment. It is rated for 15 amps at 12 volts DC and uses a 3-blade SPDT contact configuration.

The switch is constructed of stamped brass, injection molded nylon, and polycarbonate for durability in a marine environment. A locking ring with a lever seal helps resist water penetration around the mounting hole, and the protruding cap nut design makes the switch easy to grip and actuate even with wet or gloved hands. Terminals are sized at 3/8 inch and 1/2 inch for secure wire connection, and installation is straightforward for anyone rewiring or upgrading a helm or accessory panel.

Sea-Dog Line has manufactured marine hardware and electrical components since 1933, and this toggle switch is sold individually for boat builders, riggers, and DIY boat owners replacing a worn or failed switch or adding a new circuit.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420108-1
• Switch Type: Toggle Switch
• Circuit Action: On/Off/On
• Contact Type: SPDT (Single Pole Double Throw)
• Number of Blades: 3
• Current Rating: 15 Amps
• Voltage: 12 Volts DC
• Terminal Size A: 3/8 inch
• Terminal Size B: 1/2 inch
• Mounting Type: Surface Mount
• Material: Stamped Brass, Injection Molded Nylon, Polycarbonate
• Weight: 0.058 pounds
• UPC: 035514423205

Frequently Asked Questions

What does SPDT On/Off/On mean on this switch? SPDT On/Off/On describes a single pole double throw contact with three positions: one energized position, a center off position, and a second energized position, so the Sea-Dog 420108-1 can control two separate circuits or two directions from one switch.

Is this toggle switch waterproof? The Sea-Dog 420108-1 is water resistant rather than fully submersible, using a locking ring with a lever seal around the mounting hole to resist water penetration in a marine environment.

What is the amperage and voltage rating? This switch is rated for 15 amps at 12 volts DC, suitable for typical 12 volt marine circuits such as pumps, lights, and small accessories.

What terminal size does this switch use? The Sea-Dog 420108-1 has 3/8 inch and 1/2 inch spade terminals for wire connection.

What material is the switch made from? It is constructed of stamped brass, injection molded nylon, and polycarbonate, chosen for corrosion resistance in a marine setting.

How much does this switch weigh? The Sea-Dog 420108-1 toggle switch weighs 0.058 pounds.

Does this switch include an illuminated position indicator? No, the 420108-1 is a standard (non-illuminating) toggle switch; it does not light up in any position.

Can this switch reverse a motor, such as a trim tab or windlass? Yes, because the On/Off/On SPDT action provides two separate energized positions, it is commonly used to reverse small 12 volt motors or control two circuits from a single switch.

Is this a genuine Sea-Dog part? Yes, this is a genuine Sea-Dog toggle switch, part number 420108-1.

How is this switch mounted? The 420108-1 is a surface mount toggle switch installed through a panel hole and secured with its locking ring and cap nut.

What is the UPC for this product? The Sea-Dog 420108-1 toggle switch has UPC 035514423205.