Schneider Electric EVRPD-44U Digital AC/DC Voltage Relay, 100-240VAC/DC, 44U Series, Over/Under/Phase Loss Protection, 50/60Hz

Schneider Electric EVRPD-44U Digital AC/DC Voltage Relay, 100-240VAC/DC, 44U Series, Over/Under/Phase Loss Protection, 50/60Hz

The Schneider Electric EVRPD-44U is a high-performance Digital AC/DC Voltage Relay designed for comprehensive voltage monitoring and protection in industrial and commercial electrical systems. This versatile device offers robust detection capabilities for critical voltage anomalies, including over-voltage, under-voltage, phase loss, phase unbalance, and phase reversal. With a wide universal control supply voltage range of 100-240VAC/DC and compatibility with both 50Hz and 60Hz systems, the EVRPD-44U is suitable for a diverse array of global applications. Its advanced digital display and intuitive menu navigation facilitate easy setup, real-time monitoring of L1-L2, L2-L3, L3-L1 line voltages, and access to fault history, ensuring optimal operational safety and system reliability.

Manufacturer Information:

• Manufacturer: Schneider Electric
• Product Series: EVRPD
• Model/Part Number: EVRPD-44U
• Product Type: Digital Voltage Relay (Electronic Voltage Relay)
• Key Specifications:
  • Control Supply Voltage (Rated Supply Voltage A1 A2): 100-240V AC/DC, 50/60Hz (Universal control supply for flexibility in various power systems).
  • Rated Operation Voltage (L1, L2, L3): 100-480V AC, 50/60Hz (Input voltage range for monitoring).
  • Output Contacts:
    • 95-96 (Normally Open/Close configurable based on Fail Safe 'N' or 'R' type)
    • 95-98 (Normally Close/Open configurable based on Fail Safe 'N' or 'R' type)
  • Monitoring Functions:
    • Over-voltage protection (User-configurable threshold as a percentage of nominal voltage: 101-125%).
    • Under-voltage protection (User-configurable threshold as a percentage of nominal voltage: 70-99%).
    • Phase Loss detection.
    • Phase Unbalance detection (User-configurable threshold: 3-15%).
    • Phase Reversal detection.
    • Configurable trip delay times for over-voltage, under-voltage, phase loss, and unbalance detection.
    • Harmonic Distortion monitoring (Total Harmonic Distortion for L1-L2, L2-L3, L3-L1 line voltages).
    • Fundamental voltage monitoring (for L1-L2, L2-L3, L3-L1).
  • Display: Digital display for real-time voltage values, settings, trip indications, and diagnostic messages.
  • Mounting: 35mm DIN-rail and M4 screw mounting (versatile installation).
  • Wiring: Screw terminals for secure wire connections.
  • Temperature Range: Typically designed for industrial environments (though specific operating temperature isn't directly on the label, such devices usually handle -20 to +60°C).
  • Reset Options: Electric (power cycle), Manual (ESC button), Automatic (with configurable auto-reset time).
  • Diagnostic Features: Trip Cause Indication, Fault History (stores up to three recent trip events with associated voltage data), and Self-Diagnosis Test.
  • Safety Features: Fail Safe mode for trip output (N type: 95-96 open, 95-98 close when power is applied; R type: 95-96 close, 95-98 open when power is applied). Requires 3-phase voltage > 50% of nominal for "on" mode to function correctly.
• Applications:
  • Protection of motors, pumps, and compressors against voltage fluctuations and phase issues.
  • Monitoring and protection of sensitive industrial machinery.
  • Power distribution systems to ensure stable voltage supply.
  • HVAC systems.
  • Generator sets and utility grids for phase sequence and voltage monitoring.