• Insulation monitoring device for mobile generators
  • Protective isolation with insulation monitoring and shutdown
  • in Accordance with DIN VDE 0100-551 and DIN EN 61557-8
  • Two Response values (Factory settings 46 kΩ, 23 kΩ)
  • Degree of protection IP65

The ISOMETER® monitors the insulation resistance of unearthed AC, AC/DC and DC systems (IT systems) with nominal system voltages of 3(N)AC, AC/DC 0…400 V or DC 0…400 V. The maximum permissible system leakage capacitance Ce is 5 μF. DC components existing in AC systems do not influence the operating characteristics, when a minimum load current of DC 10 mA flows. A separate supply voltage allows de-energised systems to be monitored too.

  • Features
  • Applications
  • Ordering information
  • Downloads
  • Monitoring the insulation resistance for unearthed AC/DC systems
  • Measurement of the system voltage (true r.m.s.) with undervoltage and overvoltage detection
  • Measurement of DC system voltages to earth (L1+/PE and L2-/PE)
  • Two operating modes: GEn and dc
  • Automatic adaptation to the system leakage capacitance up to 5 μF
  • Selectable start-up delay, response delay and delay on release
  • Two separately adjustable response value ranges of 5…200 kΩ (Alarm 1, Alarm 2)
  • Automatic device self test with connection monitoring
  • Selectable N/C or N/O relay operation
  • Fault memory can be activated
  • RS-485 (galvanically isolated) including the following protocols:
    – BMS interface (Bender measuring device interface) for data exchange with other Bender components
    – Modbus RTU
    – IsoData (for continuous data output)
  • AC main circuits up to 400 V
  • DC main circuits up to 400 V
  • Generators according to DIN VDE 0100-551


Variants of ISOMETER® isoGEN523

TypeVersionArt. No.
isoGEN523-S4-4Digital interfaceB91016330

Downloads for ISOMETER® isoGEN523



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