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RN 5897/240

Insulation monitor

RN 5897/240


Auxiliary voltage

Alarm value

Approvals and Markings


  • 0069123
  • RN5897.12/240/61 AC/DC24-60V
The insulation monitor RN 5897/240 of the VARIMETER IMD family is a solution for optimal... more

Product description

The insulation monitor RN 5897/240 of the VARIMETER IMD family is a solution for optimal insulation monitoring of modern IT systems. The device can be used in the most flexible way for AC, DC and AC/DC systems. The setting of the parameters and the switching values is done by simple and operator friendly rotational switches on front of the device. The operating status is indicated user friendly via a multicolour LED. With a sealable transparent cover the device is protectet against manipulation.

Technical specifications

Width: 52,5 mm
Classification: For DC charging stations
Response value: 1 - 500 kΩ
IMD type: AC, DC, AC/DC
Nominal voltage IT system: AC 0 - 690 (Coupling device), DC 0 - 1000 (Coupling device) V
Auxiliary voltage: DC, AC/DC
Earth fault indicator: Yes
Approvals: UL
Response value type: Adjustable
Enclosure design: Distribution board
Type: RN 5897/240


  • Insulation monitoring according to IEC/EN 61557-8
  • Suitable for DC charging stations for electric vehicles acc. to IEC/EN 61851-23:2014/AC:2016-06
  • Universal application in non-earthed AC, DC, AC/DC networks up to AC max. 250 V or DC max. 300 V
  • With connection facility of an external coupling device RL 5898 for voltages up to AC 400 V / DC 500 V or RP 5898 for voltages up to AC 690 V / DC 1000 V
  • Extended operating temperature range of - 40 ... + 70 °C
  • Very fast reaction time ≤ 1 s
  • Optimised insulation resistance monitoring also during mains voltage variation
  • Self-test every full operating hours
  • Preventive fire and system protection
  • Detection of symmetric and asymmetric insulation faults
  • Universal application in non-earthed AC, DC, AC/DC networks
  • Easy adjustment of response value and setting parameter via rotational switch
  • Suitable for large leakage capacitances up to 5 μF
  • Monitoring also with voltage-free mains
  • Measuring circuit L(+)/L(-) with broken wire detection (can be switched off)
  • Protective conductor PE1/PE2 with broken wire detection (can't be switched off)


  • Setting range of 2nd response value (alarm): 1 kΩ … 500 kΩ
  • 1 changeover contacts each for insulation failures alarm and device failures
  • Energized or de-energized on trip can be selected for indicator relay
  • With multicolour status LED to indicate the state of operation.
  • Automatic and manual device self-test
  • Alarm storage selectable
  • Protection against manipulation by sealable transparent cover
  • External control input for combined test- / reset-button with additional stop of the measuring function
  • With semiconductor output to indicate the insulation resistance (PWM)
  • 3 wide voltage input for auxiliary voltage
  • Width 52.5 mm