Failsafe galvanic isolators interrupt galvanic current with other boats in your marina when installed on a boat which is connected to shore power. It maintains the safety ground and solves the most common forms of corrosion and premature zinc loss within a boat's bonding system by protecting your system from boats or marinas with improper wiring. In the event of a failure, it maintains safety by not compromising the ground continuity onboard when you are connected to shore power. 22074 features built in cooling if needed. UL certified and ABYC A-28 compliant and fail safe certified. Meets ISO 8846 for ignition protection for mounting within an engine compartment. Voltage: 120/240.