Voltage droopW
Voltage droop
OvervoltageW
Overvoltage
Voltage regulatorW
Voltage regulator
Voltage spikeW
Voltage spike
Surge arresterW
Surge arrester
Transient voltage suppressorW
Transient voltage suppressor
Transient-voltage-suppression diodeW
Transient-voltage-suppression diode
Uninterruptible power supplyW
Uninterruptible power supply
Zener diodeW
Zener diode