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A Galvanic Isolator, Polarisation Cell or Decoupler is used to ensure that there is separation between the grounding of a shore power supply from the ship's electrical grounding.
Whenever a marine vessel is connected to AC shore power, a bimetallic circuit can be established which can cause corrosion of the vessel and its drive system components. Any time there is a direct bond between dissimilar metals in an electrolyte, a galvanic corrosion cell, is produced.