AC-Powered, AC Voltage Monitor, Adjustable

Model Modules VMA

AC-Powered, AC Voltage Monitor, Adjustable

NAI’s VMA is a field-adjustable, AC-Powered, AC Voltage Monitor used to monitor voltage characteristics of single- or three-phase power lines. This allows normal operation of system loads when the power-line characteristics are within pre-determined limits.

High and low voltage limits, and "pick-up" and "drop-out" time delay are field-adjustable. The VMA voltage monitor is ideally suited for rugged defense and industrial applications.


  • AC-powered
  • 50/60/400 Hz
  • Accuracy ±1%
  • Repeatability 0.5% typical
  • Time delay (pick-up & drop-out) 250 ms to 10 seconds
  • Field-adjustable
  • High reliability
  • Versatile design allows for many variations

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VMA Specifications