Victron VDI-32 Galvanic Isolator - GDI000032000

Galvanic isolator prevents electrolytic corrosion. It blocks the low voltage DC currents that enter the boat through the shore cable of the shore supply. These currents can cause corrosion of metallic elements below the waterline, such as the hull, the propeller and its shaft, and others.
The galvanic isolator has in its interior two diodes connected in an antiparallel way. When connected in this way, the diodes allow current to pass in both directions, but only above a certain voltage threshold. The voltage at which the diodes are conductive is about 1.4 Vdc.

The isolator is installed directly behind the 230V connection of your boat. The direct voltage coming from the galvanic isolator is higher than the potential difference between the metals. As a result, this voltage will not allow conduction and, as such, the galvanic isolator will prevent any electrolytic current. However, should there be a higher erroneous voltage in the AC circuit, the diodes will allow the current to pass and the residual current device will interrupt the circuit.

Victron VDI-32 Galvanic Isolator Manual - GDI000032000

See Victron VDI-32 Galvanic Isolator Manual - GDI000032000