Sea-Dog Lighted DPDT Toggle Switch 420128-1, On/Off/On, 8 Blade, 15A 12V

This Sea-Dog toggle switch, part number 420128-1, is a DPDT (double pole, double throw) On/Off/On switch built for marine electrical panels. The toggle bat features a lighted tip that glows white when the switch is in the OFF position and red when switched ON, giving an at-a-glance indication of circuit status even in low light. The switch body has a locking ring and lever seal designed to resist water penetration, making it suitable for use in wet helm stations and cockpit panels. Construction is stamped brass and injection molded nylon, with a polycarbonate toggle lever for added durability against UV and saltwater exposure.

The 420128-1 is rated 15 Amps at 12 Volts DC, matching typical 12-volt marine accessory circuits such as lighting, bilge pumps, and other onboard electronics wired through a switch panel. It fits panels up to 1/4 inch thick and requires a 15/32 inch mounting hole for installation, allowing a straightforward panel-mount install without special tools. As a DPDT switch, it carries 8 terminal blades, giving it the extra switching contacts needed to control two separate circuits or a reversing (on/off/on) function from a single toggle, unlike the simpler SPDT switches in the same family.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420128-1
• Switch Type: DPDT (Double Pole, Double Throw), Toggle
• Switching Function: On/Off/On
• Number of Terminal Blades: 8
• Amperage Rating: 15 Amps
• Voltage Rating: 12 Volts DC
• Mounting Hole Diameter: 15/32 inch
• Maximum Panel Thickness: 1/4 inch
• Toggle Illumination: Lighted tip, white when OFF, red when ON
• Material: Stamped brass and injection molded nylon body with polycarbonate toggle
• Water Resistance Feature: Locking ring and lever seal
• Weight: 0.092 pounds

Frequently Asked Questions

What type of switch is the Sea-Dog 420128-1? The 420128-1 is a DPDT (double pole, double throw) toggle switch with an On/Off/On switching function, giving it 8 terminal blades so it can control two circuits or a reversing function from one toggle.

Does this switch have a lighted toggle tip? Yes, the toggle bat on the 420128-1 is lighted: it shows white when the switch is in the OFF position and red when it is switched ON, so you can see circuit status at a glance.

What size mounting hole do I need to install this switch? The Sea-Dog 420128-1 requires a 15/32 inch mounting hole and fits panels up to 1/4 inch thick.

What is the amp and voltage rating of the 420128-1 toggle switch? This switch is rated 15 Amps at 12 Volts DC, suitable for standard 12-volt marine accessory circuits.

What is the 420128-1 switch made of? It is constructed of stamped brass and injection molded nylon, with a polycarbonate toggle lever for durability in a marine environment.

Is this switch sealed against water? The 420128-1 has a locking ring and lever seal designed to resist water penetration, making it suitable for wet marine switch panels.

How much does the Sea-Dog 420128-1 toggle switch weigh? The 420128-1 weighs 0.092 pounds.

How is the 420128-1 different from the Sea-Dog 420123-1 or 420125-1 switches? The 420128-1 is a DPDT switch with 8 terminal blades, while the 420123-1 and 420125-1 are SPDT switches with 5 terminal blades; the DPDT design gives the 420128-1 the extra contacts needed to switch two circuits at once.

Is the 420128-1 a momentary switch? No. The 420128-1 is an On/Off/On switch, not a momentary type; Sea-Dog's momentary DPDT version in the same lighted toggle series is the 420129-1.

What does DPDT On/Off/On mean for wiring purposes? On the 420128-1, DPDT means the switch controls two separate poles simultaneously, and On/Off/On means it has two active positions with a center OFF position, allowing it to be wired for functions like reversing a motor or switching between two circuits.

Is the toggle switch sold as a single unit? Yes, the Sea-Dog 420128-1 is supplied as one complete toggle switch, ready to wire into a 12-volt DC panel.