True or False: An isolation transformer makes a galvanic isolator unnecessary.

An isolation transformer does indeed serve to break the direct electrical connection between the AC power source and the load, thereby providing a level of electrical separation. This separation can help reduce the likelihood of unwanted currents that might cause galvanic corrosion. However, it is important to understand that while isolation transformers can mitigate some of the risks associated with corrosion due to stray currents, they do not eliminate the need for a galvanic isolator.

Galvanic isolators specifically function to prevent galvanic corrosion by blocking direct current flow between dissimilar metals through the water in which they are immersed. The presence of an isolation transformer does not provide the same protective function as a galvanic isolator—especially in the context of preventing corrosion caused by different metals immersed in an electrolytic medium.

In summary, while an isolation transformer provides certain advantages in terms of electrical safety and isolation, it does not make a galvanic isolator unnecessary. Hence, the answer that states it is true overlooks the distinct protective role that galvanic isolators play against corrosion, making the correct understanding that an isolation transformer does not negate the necessity of using a galvanic isolator for robust protection against galvanic corrosion.