Sea-Dog 420820-1 Thermal AC/DC Circuit Breaker, 20 Amp, Panel Mount, UL Listed A-0701

The Sea-Dog 420820-1 is a thermal AC/DC circuit breaker rated for 20 Amps, built to protect an electrical circuit from damage caused by excess current. Unlike a sacrificial fuse that must be replaced once it blows, this breaker is resettable: after it trips, a simple push-to-reset action restores the circuit without swapping any parts. The housing is constructed of molded Bakelite for durability, with quick-connect, terminal-style, stamped brass contacts for a secure electrical connection. The breaker is UL Listed under A-0701 and is rated for 125-250 VAC and 32 VDC, covering both AC and DC circuits on board.

Vibration and shock resistant, the 420820-1 is built for the marine environment and uses a compact, panel-mounted design that fits standard breaker panel cutouts. It serves as an economical alternative to magnetic circuit breakers while still delivering reliable, resettable overcurrent protection. For boats operating in wet conditions, Sea-Dog offers an optional Thermal Breaker Boot (420839, sold separately) that fits over the breaker to provide additional protection against moisture.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420820-1
• Current Rating: 20 Amps
• AC Voltage Rating: 125-250 VAC
• DC Voltage Rating: 32 VDC
• Number of Poles: 1
• Circuit Breaker Type: Standard, push-to-reset (resettable)
• Housing Material: Molded Bakelite
• Contact Material: Stamped brass
• Terminal Type: Quick connect
• Mounting Type: Panel mount
• Certification: UL Listed (A-0701)
• Weight: 0.082 pounds
• UPC: 035514420488
• Optional Accessory: Sea-Dog 420839 Thermal Breaker Boot (sold separately)

Frequently Asked Questions

What amperage is the Sea-Dog 420820-1 circuit breaker rated for? The Sea-Dog 420820-1 is rated for 20 Amps.

Is the 420820-1 breaker resettable after it trips? Yes, it is a push-to-reset thermal breaker, meaning it can be reset after tripping instead of being replaced like a fuse.

What voltage does this breaker support? The 420820-1 is rated for 125-250 VAC and 32 VDC, covering both AC and DC circuits.

What is the housing of the 420820-1 made of? The housing is molded Bakelite, with stamped brass, quick-connect terminal-style contacts.

Is the Sea-Dog 420820-1 UL Listed? Yes, this breaker carries UL Listing A-0701.

How does a thermal breaker like the 420820-1 differ from a fuse? A thermal breaker is resettable after it trips, while a fuse is sacrificial and must be replaced once it blows; the 420820-1 uses a push-to-reset design.

Can the 420820-1 be used in wet marine environments? It is vibration and shock resistant and designed for marine use; for added protection in wet environments, Sea-Dog offers the optional 420839 Thermal Breaker Boot, sold separately.

What type of terminal connection does this breaker use? The 420820-1 uses quick-connect, terminal-style, stamped brass contacts.

How much does the Sea-Dog 420820-1 weigh? It weighs 0.082 pounds.

How many poles does the 420820-1 have? This is a single-pole (1 pole) circuit breaker.

Is the 420820-1 designed for panel mounting? Yes, it features a compact, panel-mounted design.

Is there an accessory to add extra water protection to this breaker? Yes, the Sea-Dog 420839 Thermal Breaker Boot fits the 420820-1 and other breakers in the series to add protection in wet environments; it is sold separately.