120V (outlet mount)

Low cost power fail alarm for household use but also indoor industrial applications.  Alarms in case of power failure. PFA-1 or PFA-2

Three phase

Three phase power alarm detects power failures, but also monitors each phase voltage and give appropriate alarm. more info here.on the PFA-3 page

240V (wall mount)

For industrial or outdoor applications. Monitors power and give an alarm if power fails. Models PFA-5 or PFA-6.