Sea-Dog 420845-1 Resettable Circuit Breaker, 50 Amp, 12/24 Volt, Without Cover

The Sea-Dog 420845-1 is an inline resettable circuit breaker rated for 50 amps, built for higher-amperage marine accessories that need reliable overcurrent protection. It features a manual reset button, so a tripped circuit can be restored with a simple push rather than replacing a fuse. The breaker is ignition protected, making it safe to install aboard gasoline powered boats, and it operates on either 12 volt or 24 volt DC systems.

Construction is injection molded nylon and polycarbonate with stamped brass #10-32 studs and nuts for secure, corrosion-resistant wiring connections. The two posts are functionally distinct: the copper post is the battery, or power in, connection, and the silver post is the auxiliary, or power out, protected connection, so wiring is straightforward once the posts are identified correctly. The 420845-1 does not include a cover; a matching splash proof breaker cover is available separately as Sea-Dog part 420840 for installations that need extra protection from moisture. This breaker complies with SAE standard J553 and SAE J1171.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 420845-1
• Current Rating: 50 Amps
• Voltage: 12 or 24 Volts DC
• Reset Type: Manual Reset Button (Resettable)
• Cover Included: No (splash proof cover sold separately, Sea-Dog 420840)
• Material: Injection Molded Nylon and Polycarbonate
• Stud Type: Stamped Brass #10-32 Studs with Nuts
• Ignition Protected: Yes
• Standards Compliance: SAE J553, SAE J1171
• Product Dimensions: 4.9 inches D x 4 inches W x 1.3 inches H
• Weight: 0.062 pounds
• UPC: 035514423809

Fitment

This is a universal marine circuit breaker for use with higher-amperage 12 volt or 24 volt DC accessory circuits; it is not restricted to a specific boat make, model, or engine.

Replaces (OEM)

No OEM cross-reference numbers are specified for this part.

Frequently Asked Questions

What amperage is the Sea-Dog 420845-1 circuit breaker rated for? The 420845-1 is rated for 50 amps, making it suitable for higher-amperage marine accessory circuits.

Can this breaker be used on both 12 volt and 24 volt systems? Yes, the Sea-Dog 420845-1 is designed to work on either 12 volt or 24 volt DC systems.

Does the 420845-1 come with a protective cover? No, the 420845-1 is sold without a cover. A matching splash proof breaker cover is available separately as Sea-Dog part 420840.

What is the circuit breaker housing made of? The Sea-Dog 420845-1 is constructed of injection molded nylon and polycarbonate, with stamped brass #10-32 studs and nuts.

Is this breaker safe to install on a gasoline powered boat? Yes, the 420845-1 is ignition protected, which makes it safe for installation aboard gasoline powered boats.

How do you reset the breaker after it trips? The 420845-1 has a manual reset button built into the breaker body; pressing it restores the circuit after an overload trips it.

What is the difference between the copper post and the silver post? On the Sea-Dog 420845-1, the copper post is the battery, or power in, connection, and the silver post is the auxiliary, or power out, protected connection.

What size are the mounting studs on this breaker? The 420845-1 uses stamped brass #10-32 studs supplied with nuts.

What standards does the 420845-1 comply with? This breaker complies with SAE standard J553 and SAE J1171.

How much does the Sea-Dog 420845-1 weigh? The 420845-1 weighs 0.062 pounds.

What are the dimensions of this circuit breaker? The Sea-Dog 420845-1 measures 4.9 inches D x 4 inches W x 1.3 inches H.

Can I add a cover to the 420845-1 later? Yes, a splash proof breaker cover is sold separately as Sea-Dog part 420840 and can be added to the 420845-1 breaker at any time.