Joules - surge protector question
I see surge protectors with differing values for joules.... but it doesn't say what is better ... is higher better than lower values ? thanks
Forum Discussion
When a metal oxide varistor is "used up" the show is over. Their weakness is relatively slow reaction time which limits usefulness with high frequency events. I did not spend extra money for 20mm devices for the heck of it. BTW the response time for a bi-directional TVS diode is four-billionths of a second. They compliment a MOV nicely. But the TVS need individual fuzing which makes them less attractive to gizmo manufacturers. A 180 volt rated TVS chops all transients off at 180-volts but they are fragile and that's where MOVs "should" take the load off.
