Victron galvanic isolator VDI-32 A

Victron galvanic isolator VDI-32 A

The galvanic isolator prevents electrolytic corrosion. It blocks low voltage direct currents that enter your boat via the shore power ground cable. These currents can cause corrosion on the metal parts of the boat underwater such as the hull, propeller, shaft, and so on.
The galvanic isolator consists internally of two diodes connected in anti-parallel fashion. This connection allows the diodes to allow current to flow in both directions, but only when a certain voltage threshold is exceeded. The voltage at which the diodes conduct is 1.4 Vdc.

The isolator is installed directly behind the 230 V connection of your boat. The forward voltage of the galvanic isolator is higher than the potential difference between metals. As a result, the voltage does not allow conduction and the galvanic isolator prevents any electrolytic current. However, if a (higher) fault current occurs in the AC circuit, the diodes allow the current to pass through and the residual current device interrupts the circuit.

manual