What does it mean when the green indicator light is off on surge protection power strips? January 27, 2023 12:57 Updated The overvoltage protection is no longer active. However, you can still use the strip, only without overvoltage protection. Related articles Is a surge protection device still functional after an overvoltage? Does the surge protection also exist when the switch of the power strip is not switched on? Why is the internal thermal fuse not exchangeable? Can I continue to use the power strip if the switch's glow lamp flickers or stops glowing? How does a surge protection device work?