Originally Posted by lbrjet
A true major surge event will fry a Progressive unit, ,,,
Good. Where are numbers define this fault? Do you feel it must be true - and then declare it as fact? Or use logic and numbers to first define what a 'surge event' is? No useful reply is possible for an emotion belief that is not even defined - and has no numbers.
Evereddie is correct except for one minor point. As protectors parts are failing, even that first surge is incoming to the 'unit it is protecting'.
Surge is a current. If that current is incoming to a protector, then that same current is outgoing into a 'protected unit' - simultaneously. Long after that current has flowed through everything, then something in that path fails - ie a near zero (sacrificial) protector part.
Any following surge is also connected to that 'protected unit' - as Evereddie describes. A thermal fuse only disconnected near zero protectors parts to avert a fire. That first and all following surges remain connected to a 'protected unit'.
A thermal fuse 'sacrificed' itself to save a human from fire - because that human purchased a near zero protector.
Meanwhile you have also confused two completely different devices called "surge protector". A protector that disconnects is for over voltages, polarity reversals, etc. Disconnecting takes milliseconds or seconds.
Surges are done in microseconds - cannot be stopped by disconnecting.
You confuse two completely different devices (both called surge protectors) that address two completely different electrical anomalies. A first post (that was read with insufficient attention and comprehension) explained that.