Galvanic ISOLATOR WITH INDICATOR For use with 120/240V 50/60Hz Correctly installed the Galvanic isolator will block Galvanic currents in the shore earth connection up to 1.1V. Above this level current is allowed to pass maintaining the safety earth connection. For almost every combination of metals likely to be found at a mooring the 1.1V maximum is sufficient to block corroding currents. When the voltage at the earth connection is greater than 1.1V, current is allowed to flow through the Galvanic isolator potentially corroding submerged metals on the boat. In this situation the shore power should be disconnected to avoid hull corrosion. D.C. Galvanic current can also be caused by other shore earth connections such as telephone & cable TV. Designed, manufactured and tested to meet ABYC. A28 standard. Meets requirements of British Marine Industry Federation. CE Marked Fully encapsulated RF suppression built in Analogue indicator shows any DC current flowing in an easy to understand scale