Sea-Dog Resettable Circuit Breaker 420842-1, 20 Amp, 12/24 Volt, No Cover

The Sea-Dog 420842-1 is a resettable inline circuit breaker built for protecting higher-amperage accessories aboard a boat. Rated at 20 amps and usable on both 12 volt and 24 volt systems, it features a manual reset button so a tripped circuit can be restored at the breaker itself instead of replacing a fuse. The body is constructed of injection molded nylon and polycarbonate with stamped brass internals, and it terminates in #10-32 studs with nuts for a secure wired connection. The copper post is the battery, or "power in," connection, while the silver post is the auxiliary, or "power out," protected side of the circuit, making correct wiring straightforward to identify at installation.

This breaker is ignition protected, meaning it is rated safe for installation aboard gasoline powered boats near the engine compartment. It complies with SAE standard J553 and SAE J1171, the marine industry standards covering circuit breaker construction and performance. This version does not include the splash proof breaker cover; the cover is available separately as Sea-Dog part number 420840 for installations needing extra environmental protection.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420842-1
• Current Rating: 20 Amps
• Voltage: 12 or 24 Volts
• Circuit Breaker Type: Resettable, Manual Reset
• Cover Included: No (cover sold separately as Sea-Dog 420840)
• Mounting: #10-32 studs with nuts
• Material: Stamped Brass / Injection Molded Nylon / Polycarbonate
• Dimension A: 1-5/16 inches
• Dimension B: 1-7/16 inches
• Dimension C: 1-3/8 inches
• Dimension D: 7/8 inches
• Weight: 0.06 pounds
• Standards Compliance: SAE J553, SAE J1171
• Ignition Protection: Ignition Protected
• UPC: 035514420730

Frequently Asked Questions

What amperage is the Sea-Dog 420842-1 rated for? The Sea-Dog 420842-1 is rated at 20 amps and is designed for use with higher-amperage accessories on a boat's electrical system.

Does this breaker work on both 12 volt and 24 volt systems? Yes, the Sea-Dog 420842-1 can be used on either 12 volt or 24 volt systems.

Does the 420842-1 include a breaker cover? No, the 420842-1 is the version without a cover. A splash proof breaker cover is available separately as Sea-Dog part number 420840.

Is this circuit breaker safe to install on a gasoline powered boat? Yes, the 420842-1 is ignition protected, which means it is rated for installation aboard gasoline powered boats.

How do I reset the breaker after it trips? The Sea-Dog 420842-1 has a manual reset button built into the body; press it to restore the circuit after a trip rather than replacing a fuse.

Which post is the power-in connection and which is power-out? On the 420842-1, the copper post is the battery, or power-in, connection, and the silver post is the auxiliary, or power-out, protected connection.

What type of terminals does this breaker use? The 420842-1 terminates in #10-32 studs with nuts for securing ring or spade terminal wiring.

What is the 420842-1 made of? It is constructed of stamped brass internals with an injection molded nylon and polycarbonate body.

What standards does this circuit breaker meet? The Sea-Dog 420842-1 complies with SAE standard J553 and SAE J1171, the marine circuit breaker standards.

How much does the 420842-1 weigh? The Sea-Dog 420842-1 weighs 0.06 pounds.

What are the dimensions of this circuit breaker? The 420842-1 measures 1-5/16 inches by 1-7/16 inches by 1-3/8 inches, with a 7/8 inch dimension at D.

What is the difference between the 420842-1 and the 420852-1? Both are 20 amp, 12/24 volt resettable breakers with the same dimensions and construction; the 420842-1 does not include a cover, while the 420852-1 includes the splash proof breaker cover.