The three-minute delay is a reconnection function. It should not be described as a three-minute wait before protection.
1. The normal sequence
- Voltage becomes too high or too low.
- The protector disconnects the appliance.
- Voltage returns to the accepted range.
- The protector confirms stability during the delay period.
- Output is restored after the delay completes.
2. Why compressor loads benefit
After a refrigerator, freezer or air conditioner stops, pressure in the refrigeration circuit may not be balanced immediately. A rapid restart can create high starting stress, failed starting or additional heating. A delay gives the system time before the next start attempt.
3. Continuous timing versus accumulated timing
For compressor protection, a conservative design normally requires the voltage to remain continuously within the safe range. If it becomes abnormal again, the countdown restarts. Accumulating separate short periods of normal voltage can restore power after only a brief final stable period.
Clear product wording: “Any voltage fluctuation during the countdown restarts the full delay, helping provide a stable and safer restart for compressor appliances.”
4. Questions buyers should ask
- Does the delay occur after every power-on or only after an abnormal event?
- Does a new fluctuation reset or pause the timer?
- Is the delay fixed or adjustable?
- What do the indicators show during countdown?
- Which appliance types were used during validation?