The CME420 series current relays monitor undercurrent and overcurrent in AC systems as well as the current between two threshold values. The current are measured as r.m.s. values (AC) where the measured value is continuously shown on the LC display. The measured AC current required to trigger the alarm relay is stored. Thanks to the CME’s adjustable delay times and variable parameters, device settings can customized to suit every application. Current measurement is possible either directly or indirectly via standard current transformers (x/5 A).


  • 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
  • 70 % agreement in accordance with EEG 2012 for PV inverters


  • Undercurrent and overcurrent monitoring in AC systems with prealarm and main alarm or current monitoring with window discriminator function
  • Current monitoring using current transformers, suitable for standard transformers x/1 A, x/5 A (depending on the device type)
  • Transformation ratio n allows adaptation to all standard current transformers x/1 A, x/5 A
  • Start-up delay, response delay and 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
  • Fault memory for the operating value
  • Cyclical self monitoring
  • Internal test/reset button
  • Two separate alarm relays with 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



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