Good job, baffin. So now you finally understand that MOVs don't WEAR. Or do you?
Your tires wear. Your brakes wear. That's a normal in-service condition the designer fully expects and accounts for. The device still meets spec and performs as intended after significant wear. Your window glass doesn't wear. If it takes a hit, it's either OK or broken. Same with MOVs. That's why they put LEDs on the better ones, so you can tell if they're OK or broken.
Dx, Your still wrong. Do a search on "MOV DEGRADATION".
MOV's are DEGRADED, or should I say WORN, by surges over the designed max. Temporary over voltages from the utility, say 140 volts instead of 120, for 10 seconds or more will cause significant WEAR on the MOV's in most of the surge strips found in stores today (MCOV of 130V). It won't toast them, but it will reduce the voltage at which it passes current. Since it begins clamping at a lower voltage than initially designed, it's peak current handling rating for it is also lower. In other words it's not as good as it was when it was new because it's WORN.
No you should NOT say WORN. You should say degraded, failed, broken, replaceitnow, goodbye, sayonara, adios.
Originally posted by baffin789
MOV's are DEGRADED, or should I say WORN, by surges over the designed max.
This is common sense. If you exceed the design max of your double-pane window and break only one pane, it still kinda keeps the rain out. But it's not WORN, it's BROKEN.