Sea-Dog 420843-1 Resettable Circuit Breaker, 30 Amp, 12/24 Volt, No Cover

The Sea-Dog 420843-1 is a 30 amp inline resettable circuit breaker built for higher amperage marine accessories that need reliable overcurrent protection. It features a manual reset button, so a tripped circuit can be restored on the spot without replacing a fuse. The breaker is ignition protected, meaning it is safe to install aboard gasoline powered boats, and it works on both 12VDC and 24VDC electrical systems.

Construction is injection molded nylon and polycarbonate housing with stamped brass #10-32 studs and nuts, giving the breaker a corrosion resistant, marine-grade build. Wiring is straightforward: the copper post is the battery or power-in connection, and the silver post is the auxiliary or power-out protected connection. This particular unit does not include the splash proof breaker cover, which is sold separately for installations needing extra weather protection. The breaker complies with SAE standard J553 and SAE J1171, the recognized standards for marine circuit protection devices.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420843-1
• Current Rating: 30 Amps
• Voltage: 12 or 24 Volts
• Cover Included: No
• Dimension A: 1-5/16 inches
• Dimension B: 1-7/16 inches
• Dimension C: 1-3/8 inches
• Dimension D: 7/8 inches
• Weight: 0.04 pounds
• Material: Injection molded nylon and polycarbonate, stamped brass studs
• Mounting Type: Bolt-on mount
• Number of Poles: 3
• Standards Compliance: SAE J553, SAE J1171
• Ignition Protected: Yes

Frequently Asked Questions

What amperage is the Sea-Dog 420843-1 circuit breaker rated for? The Sea-Dog 420843-1 is rated for 30 amps, making it suited to higher amperage marine accessories that need dedicated overcurrent protection.

Does this breaker work on both 12 volt and 24 volt systems? Yes, the 420843-1 can be used on either 12VDC or 24VDC marine electrical systems.

Does the 420843-1 come with a splash proof cover? No, this version of the breaker does not include the splash proof breaker cover. Sea-Dog sells a matching cover separately for installations that need extra weather protection.

Is this circuit breaker safe to install on a gasoline powered boat? Yes, the 420843-1 is ignition protected, which means it is designed to be safely installed aboard gasoline powered boats.

How do I reset the breaker after it trips? The 420843-1 has a manual reset button built into the housing; pressing it after a trip restores the circuit without needing to replace any part.

What are the two posts on the breaker used for? On the 420843-1, the copper post is the battery or power-in connection, and the silver post is the auxiliary or power-out protected connection.

What is the breaker housing made of? The 420843-1 uses an injection molded nylon and polycarbonate housing with stamped brass #10-32 studs and nuts for the terminal connections.

What size are the mounting studs on this breaker? The 420843-1 has stamped brass #10-32 studs with nuts for wire connections.

What are the physical dimensions of the 420843-1 breaker? The Sea-Dog 420843-1 measures 1-5/16 inches by 1-7/16 inches by 1-3/8 inches by 7/8 inches across its mounting dimensions and weighs 0.04 pounds.

Does this breaker meet any marine electrical standards? The 420843-1 complies with SAE standard J553 and SAE J1171, the standards covering circuit protection devices for marine use.

What is the difference between the 420843-1 and the 420853-1? Both are 30 amp, 12/24 volt Sea-Dog circuit breakers with the same dimensions, but the 420853-1 includes the splash proof breaker cover while the 420843-1 does not.

Can I add a cover to the 420843-1 later if I need one? Yes, Sea-Dog offers the splash proof breaker cover (420840) as a separate accessory that can be added to the 420843-1 breaker.