Victron Galvanic Isolator

The Victron Energy Galvanic Isolator Diode consists internally of two diodes connected in an anti-parallel fashion. When connected this way, the diodes allow current in both directions but only above a certain threshold voltage. The voltage at which the diodes conduct is about 1.4 Vdc. The isolator is installed directly behind your boat's 230V connection. The forward voltage from the galvanic isolator is higher than the potential difference between metals. As a result, this voltage will not allow conduction, and thus the galvanic isolator will prevent any electrolytic current. However, if there is a higher error voltage in the AC circuit, the diodes will allow current through, and the residual-current device will break the circuit.