The answer to 'when to replace surge protection' is that surge protectors should typically be replaced every 3-5 years, or sooner if they have been subjected to a major power surge. Surge protectors have a limited lifespan and their ability to protect your electronics degrades over time. After a few years of use, the internal components can wear out, making the surge protector less effective at blocking and diverting excess voltage.
It's important to monitor your surge protector and replace it if you notice any physical damage, the indicator light goes out, or it fails to protect your devices during a storm. Replacing your surge protector on a regular schedule helps ensure your valuable electronics stay safe from power surges and spikes.