Originally Posted by Flybob
Surge protectors are sacrificial devices. To protect from a major surge, the device is permanently damaged ( by design).
A protector damaged by a surge did not do effective protection. It is best called a scam. Only grossly undersized protectors fail so that naive consumers will wildly speculate it did protection.
Reality - protection inside all appliances is quite robust. A surge too tiny to overwhelm that protection may also destroy a near zero protector. That increases both sales and profits. Because many will wildly speculate only from observation. Many fail to do what is also necessary before making any conclusions - learn how the thing works; what it does. Especially spec numbers.
A technical conclusion not tempered by numbers suggests junk science reasoning. Any protector that fails on a surge is so undersized that even fire is another possibility. Spec numbers demonstrate the threat.
Meanwhile a Progressive is mostly for something that is not a surge - low voltage. But that is in a category with other anomalies - all called surges. Only some protectors also protect from surges. Unfortunately many completely different and unrelated anomalies (ie low voltage, polarity reversal, surge, floating ground) all get called surges. This confusion creates misguided sales because too many reason subjectively. Then must assume protectors work by sacrificing.
Scam protectors are so easy to promote.