Sea-Dog Toggle Switch 420101-1, SPST On/Off, 15A 12V, Water Resistant Marine Switch

The Sea-Dog 420101-1 is a water resistant SPST On/Off toggle switch built for marine electrical panels where reliable, corrosion-resistant switching is a must. It uses a locking ring with a lever seal and a protruding cap nut to resist water penetration at the panel face, making it suitable for helm stations, consoles, and other exposed-to-spray locations aboard a boat. The switch is rated 15A at 12VDC, covering common marine circuits such as cabin lights, bilge pumps, accessories, and other single-pole on/off applications.

Construction is stamped brass, injection molded nylon, and polycarbonate, giving the switch body and toggle strong resistance to moisture and everyday wear in a marine environment. It is a 2-blade SPST design, meaning it simply opens and closes a single circuit with no momentary or center-off function, and it mounts through a standard panel cutout using its threaded bushing and cap nut. Overall dimensions are 4.94 x 1.88 x 1.25 inches, and the switch weighs 0.056 pounds. This is a straightforward, drop-in replacement or new-install switch for boat owners and marine electricians wiring or upgrading a 12V DC panel.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420101-1
• Circuit: SPST
• Action: On/Off
• Terminals: 2 Blades
• Amps: 15A
• Volts: 12V
• Material: Stamped Brass, Injection Molded Nylon, Polycarbonate
• Product Dimensions: 4.94 x 1.88 x 1.25 inches
• Weight: 0.056 pounds
• UPC: 035514420754

Fitment

Universal fit for standard marine panel cutouts on 12V DC electrical systems; no make/model-specific fitment restrictions are specified.

Frequently Asked Questions

What type of switch is the Sea-Dog 420101-1? It is an SPST On/Off toggle switch, meaning it controls a single circuit with a simple on or off action and no momentary or center positions.

What is the amperage and voltage rating? The 420101-1 toggle switch is rated 15A at 12V, suitable for standard 12V DC marine circuits like lighting, pumps, and accessories.

Is this toggle switch waterproof? It is water resistant rather than fully submersible, using a locking ring with a lever seal and a protruding cap nut to resist water penetration at the panel.

What material is the Sea-Dog 420101-1 made from? The switch is constructed of stamped brass, injection molded nylon, and polycarbonate for corrosion resistance in a marine environment.

How many terminals does this switch have? The 420101-1 has 2 blade terminals, consistent with its SPST On/Off circuit design.

What are the dimensions of this switch? The Sea-Dog toggle switch measures 4.94 x 1.88 x 1.25 inches overall.

How much does the switch weigh? The 420101-1 weighs 0.056 pounds.

Will this switch fit any boat's electrical panel? Yes, the 420101-1 is a standard toggle switch designed to mount into a typical panel cutout on 12V DC marine electrical systems, with no make or model restrictions specified.

What is the difference between this switch and Sea-Dog's SPDT toggle switches? The 420101-1 is a single-pole (SPST) On/Off switch with 2 blade terminals, while Sea-Dog's SPDT models are On/Off/On switches with 3 blade terminals for controlling two circuits or directions from one switch.

Does this switch include a mounting nut? The 420101-1 toggle switch has a protruding cap nut and locking ring built into its design for panel mounting.

Is the Sea-Dog 420101-1 genuine Sea-Dog product? Yes, the 420101-1 is a genuine Sea-Dog branded marine toggle switch, not a generic aftermarket part.

What is the UPC for this switch? The Sea-Dog 420101-1 toggle switch carries UPC 035514420754.