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The CME420 series current relays monitor undercurrent and overcurrent in AC systems as well as the current between two threshold values (window discriminator function). The currents are measured as r.m.s. values (AC). 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 delay times, installation-specific characteristics, such as device-specific making currents, short-time current changes etc. can be considered. Current measurement is possible either directly or indirectly via standard current transformers (x/5 A). External supply voltage is required.

  • Features
  • Applications
  • Accessories
  • Ordering information
  • Downloads
  • Undercurrent and overcurrent monitoring in AC systems 0.1…16 A
  • Indirect current monitoring with standard current transformers x/5 A
  • Transformation ratio n allows adaptation to all standard current transformers x/5 A
  • Different monitoring functions selectable < I, > I or < I/> I
  • 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
  • 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
  • Current consumption of motors, such as pumps, elevators, cranes
  • Monitoring of lighting circuits, heating circuits, charging stations
  • Monitoring of emergency lighting
  • Monitoring of screw conveyors, e.g. in sewage plants
  • Dust removal in wood working


Optional accessories for LINETRAXX® CME420

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

Variants of LINETRAXX® CME420

TypeSupply voltage US*MeasurementDisplay rangeResponse valueArt. No.**
CME420-D-1DC 9.6…94 V/
AC 16…72 V,
42…460 Hz
via current transformer x/5A
0.1…16 A/
5…999 A
0.1…16 A x nB73060001
CME420-D-2DC 70…300 V/
AC 70…300 V,
42…460 Hz
via current transformer x/5A
0.1…16 A/
5…999 A
0.1…16 A x nB73060002
* absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)

Downloads for LINETRAXX® CME420



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