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Series: 201A AU

201A-AU Series – Three-Phase Voltage/Phase Monitor
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The 201A-AU series is a three-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50/60 Hz motors regardless of their size. This monitor provides a user-selectable nominal voltage setpoint and will automatically select between the 200 V and 400 V range. Additional adjustment knobs allow the user to set a 1–30 second trip delay, a manual restart or 1–500 second restart delay, and a 2–8 % voltage unbalance trip point. It includes advanced, single LED diagnostics where color and light patterns distinguish between faults and normal conditions. This unique microcontroller-based voltage and phase-sensing unit constantly monitors the three-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels for a specified restart delay time (or manual reset).

  • Proprietary microcontroller-based circuitry
  • Auto-sensing wide voltage range
  • Advanced LED diagnostics
  • Compact design for 8-pin; DIN-rail or surface mount
  • Adjustable voltage unbalance trip setting
  • Adjustable trip and restart delay settings
  • Constant monitoring of loss of any phase, low-voltage, high-voltage, voltage unbalance, phase reversal, harmful power line conditions
  • Automatically senses system voltage between 190–480 V ac. Saves setup time
  • Quick visual indicator for cause of trip
  • Allows flexibility in panel installation
  • Allows compatibility with a variety of motors and reduces nuisance tripping
  • Prevents nuisance tripping due to rapidly fluctuating power line conditions.

201A AU Parts

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201A AU Applications

Highlights Section

  • Fan motors
  • Air conditioners
  • Compressors
  • Heat, well, and sump pumps
  • Small conveyer motors

Series: 201A AU Resources