VBA Series Single Phase Monitoring Relay

The VBA Series Single Phase Monitoring Relay from the ATC Diversified Electronics division of Marsh Bellofram is a family of single phase voltage monitoring relays, designed to ensure the cost-effective reliable protection of critical equipment that is required to continuously operate between two voltage limits of up to 240 VAC.  Supply voltage is monitored for a preselected under and over limit.



  • Monitoring capabilities up to 240 VAC
  • Single phase Voltage Band Monitor
  • Adjustment for Voltage Trip Points (Plug in Style Only)
  • Plug in or Surface Mount Enclosures


  • Pump and motor monitoring
  • Conveyor belt chain breakage protection
  • Protection from idle running of a submersible pump
  • Light bulb burnout detection
  • Battery voltage/power supply verifications
  • Communication base control power supply monitoring