ATC Diversified SLA Series 3-Phase Universal Phase Monitoring Relays - Surface Mount Style

SLA Series Style E*

The ATC Diversified SLA series is a family of three-phase universal phase monitoring relays, designed to provide cost-effective protection against phase loss, under voltage, and phase reversal conditions that can contribute to premature motor or equipment failure and downtime. It is designed for use with three-phase systems (Delta and Wye), such as those typically found in motor control centers or other critical motor and pump monitoring applications.

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.


  • Monitors up to 480 VAC
  • Protects three-phase equipment from:
  • Phase loss
  • Under voltage
  • Phase reversal
  • Delta or Wye systems
  • Lockshaft adjustment
  • Several enclosure styles


  • Critical motor and pump monitoring
  • Water and wastewater plants
  • Sewage plants
  • Booster stations
  • Grinders
  • Irrigation equipment
  • Petrochemical
  • Machine Tool
  • Conveyors
  • HVAC/R
  • Elevators/escalators
  • Utilities
  • Processing equipment
  • Agricultural machinery and equipment
  • Renewable energy& wind power turbine monitoring
More Information
Display No
Features Automatic Reset, Manual Reset
Manufacturer ATC - Diversified
Measurement Phase Loss Sensing, Phase Sequence Sensing, Under Voltage Sensing
Type Phase Monitor
Additional Skus SLA-120-ALE, SLA-120-ALER, SLA-230-ALE, SLA-230-ALER, SLA-380-ALE, SLA-380-ALER, SLA-440-ALE, SLA-440-ALER, SLA-575-ALE
Additional Details

*Pricing & appearance may vary based on configuration!* Please configure product above.

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