AUTOGUARD Self Test Technology 1st introduced by Hubbell over 15 years agoself test monitoring now required in UL 943 GFCI Safety Standard Hubbell AUTOGUARD GFCI receptacles continually test and monitor for people protection capability automatically. This patented safety feature includes disconnecting power to the receptacle if critical components are damaged and GFCI protection is lost. GFCI auto-monitoring is conducted continuously within every 30 seconds. Also, a clear visual indicator is provided on the device face representing power status, trip condition, ground fault condition and end of life status. In addition, for added safety, power will be denied to the receptacle face if reverse wiring of line and load was to occur.