We are talking about let through voltage or rather what spike in voltage will prompt a surge protector to divert unwanted electricity from the protected line. This component degrades when its exposed to either a small number of large surges or a larger number of smaller surges.

Details About Cci 9 Outlet Ground Surge Protector W 3 Phone Jacks Ps 901ft 1
Surge protector ground light. When it comes to your electronics the last thing youd probably get excited for is a surge protector. Ground light indicates that a good ground is detected in the outlet and that the protector has somewhere to shunt excess voltage. Both lights being lit is a good thing. All back ups and surgearrest products equipped with a site or building wiring fault indicator. If the light is not illuminated there is a problem with the ac outlet into which the cyberpower surge suppressor is plugged. The problem must be resolved before the cyberpower surge suppressor can be used.
On apc ups products this indicator is typically on the rear panel. These arent the sexy pieces of hardware that grab headlines or turn your dusty old computer. Globe electric designer series 3 outlet usb surge protector desktop power strip 4x usb port 3 grounded outlets 6 ft fabric power cord reset button white finish item 1946427 model 78428. Philips 6 outlet surge protector tap 2 pack 900 joules 3 prong space saving design protection indicator led light white spp3466wa37 47 out of 5 stars 1368 1499 14. The ground indicator light should be illuminated. The purpose of this indicator light is to warn you that there are problems with your building wiring that may result in a shock hazard.
The surge light indicates that the protector is still within its manufacturers coverage life and will still provide the expected levels of protection. Surge protectors limits the voltage supplied to an electrical device by either blocking or shorting to ground any unwanted voltages above a safe threshold. A typical surge protector uses a component called a metal oxide varistor mov. Philips 6 outlet surge protector tap 2 pack 900 joules 3 prong space saving design protection indicator led light white spp3466wa37 by philips 1499 14. When the voltage spikes the surge protector effectively diverts that extra voltage to the mov component. If this is the case please disconnect the surge suppressor until the problem is resolved.
The site wiring fault swf led light is only present on 120v ups and surge products.