GoKawiilSurge protectors' MOV components wear out silently over time
Most household surge protectors rely on metal-oxide varistors (MOVs) to absorb excess voltage, but these components degrade with each surge and even with normal use over time. A worn-out surge protector often looks and functions identically to a new one, continuing to power devices even after its protective capability has failed. Some models are designed to cut power to outlets once the MOV protection is no longer functioning, but many are not.