Dold Italia S.r.l.

Via Privata Passo Pordoi, 5
20139 Milano
RN 5897/011

Insulation monitor

RN 5897/011


Auxiliary voltage

Alarm value

Prewarning value

Approvals and Markings


  • 0069283
  • RN5897.12/011/61 AC/DC24-60V
The insulation monitor RN 5897/011 of the VARIMETER IMD family is a solution for optimal... altro

Descrizione del prodotto

The insulation monitor RN 5897/011 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 even with large leakage capacity to earth (PE). The adjustment of the setting values is simple and user friendly done on 2 rotary switches on the front of the device. Via display and LEDs the measured value, device parameters and device status are indicated easy to read. With a sealable transparent cover the device is protectet against manipulation. The RN 5987/011 has an additonal Modbus RTU-interface. All measured values, device states and parameters can be read out, set and parameterized. All functions available on the device can also be operated via Modbus.

Specifiche tecniche

Width: 52,5 mm
Response value: 1 - 2000 kΩ
IMD type: AC, DC, AC/DC
Nominal voltage IT system: AC 0 - 230, AC 0 - 690 (Coupling device), DC 0 - 230, DC 0 - 1000 (Coupling device) V
Auxiliary voltage: AC/DC
Earth fault indicator: Yes
Approvals: UL
Response value type: Adjustable
Bus interface: Modbus RTU
Enclosure design: Distribution board
Type: RN 5897/011

Vorteile / Kundennutzen

  • Preventive fire and system protection
  • Detection of symmetric and asymmetric insulation faults
  • Quick fault localisation through selective earth fault detection to L+ and L-
  • 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
  • Easy adjustment of response values and setting parameter via rotational switch and menu display or via Modbus RTU-interface
  • Suitable for large leakage capacitances up to 1000 μF
  • Optimised reaction time for large leakage capacitances
  • 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)
  • 2 changeover contacts each for insulation failures-Pre-alarm and -alarm each galvanically isolated
  • With galvanic separated Modbus RTU interface


  • Insulation monitoring according to IEC/EN 61557-8
  • Trigger output for insulation fault locating system
  • 2 separate adjustable response thresholds (using e.g. for pre-Alarm and Alarm)
  • Setting range of 1st response value (Pre-Alarm): 1 kΩ … 2 MΩ
  • Setting range of 2nd response value (Alarm): 1 kΩ … 2 MΩ
  • Energized or de-energized on trip can be selected for indicator relay
  • Display for indication of measured value, device parameters and device status
  • Setting the maximum leakage capacitance to shorten the response time
  • Automatic and manual device self-test
  • Alarm storage selectable
  • Protection against manipulation by sealable transparent cover
  • External control input for combined Test-/Reset-button
  • 2 wide voltage input for auxiliary voltage
  • Width 52.5 mm