Product of Bender

Bender VM Series Voltage Monitoring Relay is manufactured for the frequency, undervoltage and overvoltage, phase sequency, phase failure and asymmetry monitoring in AC / DC 3(N)AC systems. VM Series Voltage Monitoring Relay ensures the standards of IEC 60364-4-43 and DIN VDE 0100-430

Bender VM Series Voltage Monitoring Relay is manufactured for the frequency, undervoltage and overvoltage, phase sequency, phase failure and asymmetry monitoring in AC / DC 3(N)AC systems. VM Series Voltage Monitoring Relay ensures the standards of IEC 60364-4-43 and DIN VDE 0100-430.

VM Series Voltage Monitoring Relay | Technical Features

VME420 Current monitoring relays for monitoring 3AC currents for overcurrent and undercurrent

The VME420 series voltage relays are designed to monitor the frequency, undervoltage, overvoltage and the voltage between two threshold values 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 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 relays require an external supply voltage.

  • Undervoltage, overvoltage and frequency monitoring of AC/DC systems 0…300 V
  • Various monitoring functions selectable < U, > U, < f, > f
  • Supply voltage US: DC 9,6 V…94 V, AC 16…72 V, 15…460 Hz // DC 70…300 V, AC 70…300 V, 15…460 Hz
  • Nominal system voltage Un :  AC/DC 0…300 V / 15…460 Hz
  • Type
Supply voltage US* Nominal system voltage Un* Art. No.** 
VME420-D-1 DC 9,6 V…94 V / AC 16…72 V, 15…460 Hz AC/DC 0…300 V / 15…460 Hz B73010001
B93010001
VME420-D-2 DC 70…300 V / AC 70…300 V, 15…460 Hz AC/DC 0…300 V / 15…460 Hz B73010002
B93010002

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

VMD420 Three-phase voltage and frequency monitoring relay

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.

  • 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
  • Nominal system voltage Un: 3(N)AC 0…500 V / 288 V 15…460 Hz
  • Supply voltage US: AC 16…72 V, DC 9,6…94 V, 15…460 Hz  //  AC/DC 70…300 V, 15…460 Hz
Type Supply voltage US* Nominal system voltage Un* Art. No.** 
VMD420-D-1 AC 16…72 V / DC 9,6…94 V, 15…460 Hz 3(N)AC 0…500 V / 288 V 15…460 Hz B73010005
B93010005
VMD420-D-2 AC/DC 70…300 V, 15…460 Hz 3(N)AC 0…500 V / 288 V, 15…460 Hz B73010006
B93010006

VMD461 Multifunctional voltage relay for AC, DC, 3(N)AC systems

The multifunctional voltage monitoring relay VMD461 monitors frequencies, undervoltages and overvoltages in DC, AC and 3(N)AC systems. The phase voltages and/or line-to-line voltages are measured as r.m.s. value and are continuously shown on the device display.

The measured value required to trigger the alarm relay is stored. The VMD461 features additional measuring functions for:

  • ROCOF df/dt
  • Vector shift monitoring
  • Unbalance monitoring
  • Phase sequence monitoring

The corresponding ANSI codes for all available measuring functions are provided. Configurable delay times allow considering special installation-specific properties (e.g. device-specific start-up procedures). The VMD461 requires an external supply voltage.

The optional use of a CD440 coupling device extends the voltage range that can be monitored to DC/3AC 1200 V or 1AC/3NAC 690 V.

  • Voltage monitoring up to 1200 V
  • All functions are represented in ANSI codes
  • 3-stage voltage and frequency monitoring with a corresponding response delay
  • Can be used optionally for a wide variety of system configurations such as AC, 3AC, 3NAC and DC
Type Supply voltage Us Art. No. 
VMD461-D-2 AC/DC 100…240 V B93010047
Type Size Download Link
General Catalog PDF 1 MB Download
Earth Leakage Relays Catalog PDF 1 MB Download

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