Surge Protectors Degrade Over Time, Requiring Regular Replacement

Surge Protector Degradation

Surge protectors, commonly found in households, utilize components like metal-oxide varistors (MOVs) to absorb and redirect excess voltage. These MOVs degrade over time, even without significant voltage surges, and repeated spikes accelerate this wear. This degradation means the device's protective capacity diminishes.

Lack of Visible Wear

The wear and tear on surge protectors are not typically visible. A degraded surge protector may continue to power devices, even though its internal MOV components are no longer functioning correctly. Some designs will shut off outlets when the protection mechanism fails, but this is not universal.

Identifying a Failed Protector

To determine if a surge protector is still functional, users should check for an indicator light, often labeled "Protected" or "Protection Present." An unlit protection indicator typically signifies that the surge-suppression components have failed. Consulting the product's instructions or manufacturer information is necessary to interpret specific indicator light meanings.

Replacement Guidelines

If the indicator light shows that protection has failed, or if there are obvious signs of damage like smoke, scorch marks, or melting plastic, the surge protector should be replaced. Replacement is also advised after significant electrical events, such as a lightning strike nearby.