SLU-0200 Series Universal Phase Monitoring Relay

The SLU-0200 Phase Monitor Relays (3-Phase Monitors) provide cost-effective protection against premature equipment failure or downtime caused by voltage faults or untimely outages on 3-Phase systems (Wye or Delta). The SLU-0200 comes complete with ‚ÄúRapid Cycle Lockout.”

The SLU-0200 provides cost effective protection against premature equipment failure caused by voltage faults on 3-Phase systems (Wye or Delta). This unit can be easily adjusted for voltage, imbalance percentage and time delay requirements to protect against unbalanced voltages or single phasing regardless of any regenerative voltages.

Designed with high noise environment applications in mind, the SLU-0200 can be utilized for most generator type applications. Unique features of the SLU-0200 includes auto-ranging scales (200-500v 3 phase), adjustable restart delay, adjustable fault delay, automatic reset, and rapid cycle lockout.

Notes: Both DELTA and WYE systems may be monitored. In Wye systems, connections to neutral are NOT required. Can be used for most generator applications. Not recommended for variable frequency drive applications. Call technical support for application assistance.



  • Monitors up to 480 VAC
  • 8-pin plug-in version
  • Automatic¬† reset
  • LED fault
  • Adjustments for:
  • Unbalance percentage
  • Fault delay time
  • Restart delay


  • Critical motor and pump monitoring
  • Water and wastewater plants
  • Sewage plants
  • Booster stations
  • Irrigation equipment
  • HVAC/R