What is the primary role of a galvanic isolator in an electrical system?

The primary role of a galvanic isolator in an electrical system is to prevent corrosion and protect marine electrical systems by blocking DC current. Galvanic isolators work by allowing AC current to pass through while preventing the flow of DC current which can result from stray grounding currents. This is particularly important in marine environments where metal components can become corroded due to electrolysis. By blocking DC current, galvanic isolators help maintain the integrity of the electrical system and reduce the risk of damage to vessels and their equipment.

Focusing on the other options, enhancing power supply stability relates more to voltage regulation and filtering rather than the specific function of a galvanic isolator. Improving battery life typically involves proper charging practices and battery maintenance, not the roles filled by a galvanic isolator. Lastly, while reducing AC noise is important in certain applications, a galvanic isolator's primary function does not directly address noise problems in the system. Hence, the focus on blocking DC current accurately encapsulates the essential purpose of a galvanic isolator in electrical systems.