Abstract: A cathodic protection (CP) interruption system includes a metallic structure and a plurality of passive CP units embedded in an electrolytic medium, a plurality of test units electrically coupled with the structure and each of the CP units, and a low-power consumption component arrangement. The arrangement includes a real-time clock (RTC) and a GPS receiver coupled with each test unit for receiving GPS time from a GPS satellite. A controller is communicatively coupled with each RTC and GPS receiver for activating the GPS receiver once the RTC reaches a predetermined time to synchronize a RTC time of each RTC with GPS time. Interruption modules are coupled in electrical and data communication with the controller. The controller selectively changes an activation state of each interruption module once the RTC time reaches a predetermined activation state change time to selectively electrically couple or decouple each CP unit from the structure.