Model PND

  Technical Reference Sheet

  Phase-Guard   Model PND

             UL LISTED 573U

   INDUSTRIAL CONTROL EQUIPMENT

The master relay coil in this model is de-energized when conditions are normal.

Upon phase loss or phase unbalance(12% or more)  the master relay will energize

after the time delay has elapsed (standard 1 ½ seconds).

The master relay will not react to a total power interruption of any duration.

The PND model will automatically reset when fault has been corrected and balanced

Voltage is restored

            Standard features

            Model PND includes led indicators for normal (green) and phase loss (yellow) as a standard

            feature.  It also includes DPDT output relay with 30 amp contact rating.

           A total power loss will not affect the model PND since the master relay is normally

           de-energized.  This characteristic helps eliminate the possibility of nuisance tripping during

           storms and other outages.

           The PND model is recommended for applications involving a main breaker or  bolted pressure

           switch which must be manually reset after an outage occurs.

Available Options