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Galvanic Isolators

A galvanic isolator is a device used to block low voltage DC currents coming on board your boat on the shore power ground wire. These currents could cause corrosion to your underwater metals; through hulls, propeller, shaft etc.

Additonal resources:
DEI Galvanic corrosion overview  
Blog post about the relative merits of galvanic isolators and isolation transformers

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