Each Shore Power Feeder is protected by what device at the Ship's Service Switchboard?

The correct answer is that each Shore Power Feeder is protected by a circuit breaker at the Ship's Service Switchboard. Circuit breakers are designed to automatically interrupt electrical flow when there is an overload or short circuit, thus protecting the electrical system from damage. In the context of a ship's electrical system, this is crucial as it ensures safety for both the equipment and personnel onboard.

Shore Power Feeders are the electrical connections that allow a ship to receive power from an external source while docked. The use of circuit breakers in this setup ensures that if any fault occurs, the circuit can be quickly interrupted, minimizing potential hazards such as electrical fires or equipment damage. This level of protection is essential for maintaining the overall safety and reliability of the ship's electrical system when connecting to shore power.

Other options, like fuses, do offer protection by breaking the circuit when a fault occurs; however, they require replacement after they have blown, which can be less efficient for operations that may require frequent reconnections. Relays could also be involved in control or protective functions but do not serve as the primary protective device for the feeders. Transformers are used to step voltage levels up or down but are not protective devices. Therefore, the circuit breaker is the most effective and