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.