- Nov 2, 2022
Yes. Zero Surge was the original. My understanding is that the patents expired and that is how Furman and Audioquest went with Series Mode protection.
This is the patent that I believe is the key one
A surge suppressor for repeatedly protecting a load against surges occurring on A-C power mains from lightning surges or the like comprises a first series circuit having a first inductance and a first alternating voltage limiter, including at least a first capacitance and a bidirectionally...patents.google.com
So which furman do you recommend that have this?