The VOLTGUARD will disconnect the power to your appliance if the mains goes below or above (user adjustable using iSenseTM) pre-set limits. The VOLTGUARD will re-connect automatically only after the supply has returned to acceptable limits after the set delay time. You can set the standard delay time to 30 seconds or 3 minutes using the front dial. TimeSaveTM function With a built in TimeSaveTM function, the VOLTGUARD will reconnect automatically in 10 seconds if the unit has been switched off for more than the set standard delay (30 seconds or 3 minutes), thereby ensuring longer operating time and reducing unnecessary longer start up delay. iSenseTM function The iSenseTM technology allows you to control how sensitive the VOLTGUARD is to voltage problems. Using the iSenseTM dial you can set the desired level of protection and startup delay.