LINETRAXX® VMD420

  • Undervoltage, overvoltage and frequency monitoring in 3(N)AC systems 0…500 V
  • Various monitoring functions selectable < U, > U, < f, > f
  • Asymmetry, phase failure and phase sequence monitoring
  • Adjustable start-up delay, response delay and delay on release

The multi-functional VMD420 series voltage relay is designed to monitor the frequency, undervoltage and overvoltage and the voltage between two threshold values in 3(N)AC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The devices require an external supply voltage.

Questions? Contact us!

LINETRAXX® VMD420
LINETRAXX® VMD420
  • Undervoltage, overvoltage and frequency monitoring in 3(N)AC systems 0…500 V
  • Various monitoring functions selectable < U, > U, < f, > f
  • Asymmetry, phase failure and phase sequence monitoring
  • Adjustable start-up delay, response delay and delay on release

The multi-functional VMD420 series voltage relay is designed to monitor the frequency, undervoltage and overvoltage and the voltage between two threshold values in 3(N)AC systems. The voltages are measured as r.m.s. values. The currently measured value is continuously shown on the LC display. The measured value required to trigger the alarm relay is stored. Due to adjustable response times, installation-specific characteristics, such as device-specific start-up procedures, short-time voltage fluctuations, etc. can be considered. The devices require an external supply voltage.

Questions? Contact us!

Features

  • Undervoltage, overvoltage and frequency monitoring in 3(N)AC systems 0…500 V
  • Asymmetry, phase failure and phase sequence monitoring
  • Different monitoring functions selectable < U, > U, < f, > f
  • Start-up delay, response delay, delay on release
  • Adjustable switching hysteresis
  • r.m.s. value measurement (AC)
  • Digital measured value display via multi-functional LC display
  • Preset function (automatic assignment 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)
  • Indication of the system frequency
  • RoHS-compliant

Applications

  • Monitoring of voltage-sensitive machines and electrical installations
  • Switching on and switching off at a certain voltage level
  • Monitoring of stand-by and emergency supply systems
  • Supply voltage monitoring of portable loads
  • Protection of three-phase motors against phase failure and
  • Transformer protection, asymmetrical load can be recognized

LINETRAXX® VMD420 Variant(s)

TypeSupply voltage US*Nominal system voltage Un*Art. No.**
VMD420-D-1AC 16…72 V / DC 9,6…94 V, 15…460 Hz3(N)AC 0…500 V / 288 V 15…460 HzB73010005
B93010005
VMD420-D-2AC/DC 70…300 V, 15…460 Hz3(N)AC 0…500 V / 288 V, 15…460 HzB73010006
B93010006

* absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)

Optional Accessories for LINETRAXX® VMD420

TypeArt. No.
Mounting clip for screw mounting (one piece per device)B98060008
Mounting frame XM420B990994 

Downloads for LINETRAXX® VMD420

NameCategorySizeLanguageTimestampD-/B-Number
TÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x und VMx420 Certificates 431.9 KB DE2023/01/1212.01.2023
TÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x and VMx420 Certificates 411.7 KB EN2023/01/1212.01.2023
UKCA - VMx42x Declarations of Conformity 141.7 KB 2022/12/2020.12.2022
VMx42x CE Declarations of Conformity 93.7 KB 2022/11/0404.11.2022
VMD420 Manuals 5.7 MB EN2022/06/0909.06.2022D00137
VMD420 Datasheets 372.2 KB EN2022/08/1010.08.2022D00137
VMD420 Quickstarts 964.6 KB EN2024/05/2323.05.2024D00137
XM420 interface options Datasheets 223.5 KB EN2019/05/1313.05.2019D00051
Changed variants of relays from goldplated to silver-plated contacts Technical Information 166.3 KB EN2022/06/2727.06.2022