The Marpac Resettable Inline Circuit Breaker 20 Amp 7-1172 is a reliable boat part designed to protect electrical circuits from overloads. With a maximum amperage of 20 A, this circuit breaker from a trusted brand like Marpac is ideal for marine applications. The resettable feature allows for easy maintenance and ensures that the circuit breaker can be used again after an overload has occurred, preventing unnecessary downtime on the boat.