In article , Grant Erwin wrote:

Thing I don't like about those superstrip overvoltage protectors is that
yes, they work - once. After that, you don't have any more protection.
And you have no way of knowing!

actually, they work multiple times, it is just the catastrophic surge
that snuffs them. momentary 6-1200 volts spikes are not destructive.

So a prudent guy would be soldering in new whatever-they-ares, look like
Chiclets with leads on them, every few months. And who's going to do that?
Grant Erwin

right, nobody. there must be a way to test, some newer units have an
led condition indicator. older models sometimes had a window over the
MOV. i guess it looks "zapped" when it is. --Loren


Eastburn wrote:

- e.g. buy a power plug strip that has lightening
strike
protection - and use it between the speed controller and the motor.
That will
protect both motor and speed controller to a great extent.