Standard Features on All Models

• Upon phase loss, or phase unbalance (12% or more) the master relay will trip after the time delay (standard 1.5 seconds) has elapsed.
  Features can be added to make any of these settings can be adjustable and customizable.
• Phase Guard will automatically reset whenever the cause of the fault has been corrected and balanced voltage is restored.
• All models include DPDT output relay with 30 amp contact rating.
• A two line display shows the current state of the relay.
• If voltage is normal, after 10 minutes, the display will begin cycling through relay state and latest fault.
• An event log records the 50 most recent voltage faults and the date and time they occurred.

Phase Guard Model P

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

The master relay will trip on a loss of 1 or 2 phases and also on total power loss.

Recommended Use

This model is recommended for protection of pumps, compressors, ventilation fans, etc. or any individual or group of motors on a common feed.

Phase Guard Model PND

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

The master relay will not trip on total power loss.

Recommended Use

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 power 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.

Additional Options

The functionality of each Phase Guard can be extended and fully customized with a variety of different options and features. These options can be purchased at the time of the original order or they can be purchased at a later date and activated on the Phase Guard by using the Admin Software.
View List of Available Options