The voltage relays of the VME420 series are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values (window discriminator function) in AC and DC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value leading to the activation of the alarm relays will be stored. Due to adjustable response times, installationspecific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. Device version VME420 requires an external supply voltage.

  • Features
  • Applications
  • Accessories
  • Ordering information
  • Downloads
  • Monitoring AC/DC systems for undervoltage, overvoltage and frequency in the voltage range of 0…300 V
  • Various monitoring functions selectable
    < U, > U, < f, > f
  • Start-up delay, response delay and delay on release
  • Adjustable switching hysteresis
  • r.m.s. value measurement (AC+DC)
  • Digital measured value display via multi-functional LC display
  • Preset function (automatic setting of basic parameters)
  • LEDs: Power On, Alarm 1, Alarm 2
  • Measured value memory for operating value
  • Continuous self monitoring
  • Internal test/reset button
  • Two separate alarm relays (one changeover contact each)
  • N/C or N/O operation and fault memory behaviour selectable
  • Password protection for device setting
  • Sealable transparent cover
  • Two-module enclosure (36 mm)
  • Push-wire terminal (two terminals per connection)
  • RoHS compliant
  • Single-phase voltage and frequency monitoring of machines and electrical installations
  • Earth fault monitoring in medium-voltage systems via voltage transformers
  • Monitoring of battery systems
  • Switching on and switching off at a certain voltage level


Optional accessories for LINETRAXX® VME420

TypeArt No.
Mounting clip for screw fixing (1 piece per device)B98060008

Variants of LINETRAXX® VME420

TypeSupply voltage US*Nominal system voltage Un*Art. No.**
VME420-D-1DC 9,6 V…94 V / AC 16…72 V, 15…460 HzAC/DC 0…300 V / 15…460 HzB73010001
VME420-D-2DC 70…300 V / AC 70…300 V, 15…460 HzAC/DC 0…300 V / 15…460 HzB73010002
* absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)

Downloads for LINETRAXX® VME420



Category Prodotto Language Size Download