- Monitors Delta or Wye Systems
- Monitors up to 480 VAC
- Fixed, Lock Shaft, or Screwdriver Adjustment
- Automatic Reset with Manual Option Available
- Plug-in or Surface Mount Styles
With normal operating voltages applied in the proper ABC sequence, the internal relay will energize. When incorrect phase sequence or phase loss occurs, or the three-phase voltages fall below the drop-out voltages, the relay will de-energize.
When a phase is lost while the motor is running, a condition known as regeneration occurs where a voltage is induced into the open phase nearly equal in magnitude to the normal phase-to-phase voltage. However, with the exception of lightly loaded motors, enough change is detected by the SLA to provide the required protection when properly adjusted.
- Phase Loss
- Under Voltage
- Phase Reversal