Sea-Dog 420109-1 SPDT Momentary On/Off/Momentary On Toggle Switch, 15 Amp 12 Volt

The Sea-Dog 420109-1 is a water-resistant toggle switch built for marine electrical panels where reliable momentary control is needed. It is wired SPDT (single-pole, double-throw) with a Momentary On/Off/Momentary On circuit across 3 blades, meaning the toggle springs back to the center off position when released from either direction rather than latching on. This makes it well suited for applications like trim tabs, windlass controls, horns, or other functions that should only run while the switch is actively held.

Construction is stamped brass, injection molded nylon, and polycarbonate, with a locking ring and lever seal designed to resist water penetration at the panel mount, protecting the switch body from spray and splash in a marine environment. The switch is rated 15 Amps at 12 Volts DC and uses 3/8 inch and 1/2 inch terminal dimensions for easy wiring with standard connectors.

Sea-Dog backs the 420109-1 with a 90 day warranty. It is sold as a single switch and is a direct fit anywhere a 420109-1 momentary on/off/momentary on toggle switch is specified.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420109-1
• Circuit Type: SPDT Momentary On/Off/Momentary On
• Blades: 3
• Amperage: 15 Amps
• Voltage: 12 Volts DC
• Terminal Dimensions (A x B): 3/8 inch x 1/2 inch
• Connector Type: Quick Connect
• Material: Stamped brass, injection molded nylon, polycarbonate
• Weight: 0.058 pounds
• Warranty: 90 days
• UPC: 035514423212

Frequently Asked Questions

What circuit type is the Sea-Dog 420109-1 wired for? The 420109-1 is an SPDT switch wired Momentary On/Off/Momentary On, so it springs back to the center off position when released from either direction rather than staying latched on.

Is this toggle switch illuminated? No, the 420109-1 is not an illuminating switch. It is a standard, non-lit toggle with a momentary on/off/momentary on action.

What amperage and voltage is the 420109-1 rated for? It is rated 15 Amps at 12 Volts DC, matching typical 12V marine electrical circuits.

What is the 420109-1 toggle switch made of? Construction is stamped brass, injection molded nylon, and polycarbonate, giving the switch a water-resistant, corrosion-resistant build for marine panels.

How is the 420109-1 sealed against water? A locking ring with a lever seal is used at the panel mount to resist water penetration around the toggle.

What terminal size does the 420109-1 use? The switch uses 3/8 inch and 1/2 inch terminal dimensions, sized for standard quick-connect wiring.

How many blades does the 420109-1 have? The Sea-Dog 420109-1 has 3 blades as part of its SPDT circuit design.

What is a good application for a momentary on/off/momentary on switch like the 420109-1? This action suits controls that should only run while actively held, such as trim tab, windlass, or horn circuits, since the toggle returns to off on its own when released.

Does the 420109-1 come with a warranty? Yes, Sea-Dog backs the 420109-1 toggle switch with a 90 day warranty.

What is the weight of the Sea-Dog 420109-1? The 420109-1 toggle switch weighs 0.058 pounds.

How is the 420109-1 different from Sea-Dog's illuminating toggle switches? The 420109-1 is a non-illuminating toggle, while Sea-Dog's illuminating toggle switch line lights up red in the on position; the 420109-1 does not have that lit indicator.