I looked at the Progressive device in the link provided above - here is what it says . . .
"Time Delay for A/C Compressor:
If the AC power is interrupted, or the EMS detects a fault condition, the built-in time delay is activated. There are two settings on the EMS: one is a 136-seconds (02:16) time delay and the other is 15 seconds. Consult your air conditioner manual to see if it has a time delay built in. If so, use the 15 second delay, if not; use the 136-second delay. The factory setting is 15 seconds."
Do you know if your A/C compressor is being protected? Should your EMS be set for 15 seconds or 136 seconds? Apparently there is a time delay of some sort? Perhaps there is a way to turn it off altogether?
It says the low is 104 volts and the high is 132. To me this means if power goes high or low even for a split second your device will cut power and then there will be a time delay to protect your A/C. I believe the delay is there whether the A/C is in operation or not - at least ours is. If the time delay is not working your A/C may not be protected.
So again - the point is - if you have a device that will keep your voltage somewhere between the 104 and 132 cutoff points you will have fewer trips of your protection. If there is a time delay it can be very annoying to have your power going on and off and then waiting for it to come back on. Even if the cutoff voltage is detected for a split second you could be out of power for 2 or 3 minutes.
Perhaps a device that is supposed to have a time delay but is not providing the delay could be some problem with the device not working as designed?