ISOMETER® isoRW425

  • Ground-fault monitoring device for AC and DC IT systems
  • Application control circuits in railway vehicles according to EN 50155
  • Insulation impedance measurement (Z mode) for 50 Hz or 60 Hz
  • Automatic adaptation to the system leakage capacitance up to 300 μF
  • Measurement of the nominal system voltage (RMS) with undervoltage and overvoltage detection

The ISOMETER® isoRW425 monitors the insulation resistance of ungrounded AC, AC/DC and DC Systems (IT systems) for railway applications up to AC/DC 0…440 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.

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ISOMETER® isoRW425
ISOMETER® isoRW425
  • Ground-fault monitoring device for AC and DC IT systems
  • Application control circuits in railway vehicles according to EN 50155
  • Insulation impedance measurement (Z mode) for 50 Hz or 60 Hz
  • Automatic adaptation to the system leakage capacitance up to 300 μF
  • Measurement of the nominal system voltage (RMS) with undervoltage and overvoltage detection

The ISOMETER® isoRW425 monitors the insulation resistance of ungrounded AC, AC/DC and DC Systems (IT systems) for railway applications up to AC/DC 0…440 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.

Questions? Contact us!

Features

  • Monitoring of the insulation resistance (R mode) or the insulation impedance (Z mode) of unearthed 3(N)AC, AC and
  • DC systems (IT systems) with galvanically connected rectifiers or inverters
  • Insulation impedance (Z mode) for 50 Hz or 60 Hz
  • Measurement of the nominal system voltage (RMS) with undervoltage and overvoltage detection
  • Measurement of DC voltages system to earth (L+/PE and L-/PE)
  • Automatic adaptation to the system leakage capacitance up to 300 μF in R mode and 1μF in Z mode
  • Automatic device self test with connection monitoring
  • Selectable start-up delay, response delay and delay on release
  • Two separately adjustable response ranges of 1…990 kΩ (Alarm 1, Alarm 2)
  • Alarm signalling via LEDs (AL1, AL2), a display and alarm relays (K1, K2)
  • N/C operation or N/O operation selectable
  • Measured value indication via multifunctional LCD
  • Fault memory can be activated
  • RS-485 (galvanically isolated) interface including the following protocols:
    – BMS interface (Bender measuring device
  • interface) for data exchange with other Bender components
    – Modbus RTU
    – isoData (for continuous data output)
  • Password protection to prevent unauthorised changes of parameters

Applications

  • AC control circuits in industry, mechanical engineering, power stations, elevators, automation systems and railway systems in accordance with EN 50155
  • AC control and auxiliary circuits in accordance with DIN EN 60204-1 “Electrical equipment of machines”, IEC 60204-1, EN 60204-1
  • AC auxiliary circuits in accordance with DIN VDE 0100-725
  • Smaller AC IT systems such as lighting systems, mobile generators

ISOMETER® isoRW425 Variant(s)

TypeNominal system voltage UnSupply voltage USArt. No.*
isoRW425-D4W-43(N)AC, AC 0…440 V/DC 0…440 V, 15…460 HzDC 24…240 V / AC 100…240 V, 47…63 HzB71037000W
B91037000W

*(B7… = push-wire terminal / B9… = screw-type terminal)

Optional Accessories for ISOMETER® isoRW425

TypeArt. No.
Mounting clip for screw mounting (one piece per device)B98060008
Mounting frame XM420B990994 

Downloads for ISOMETER® isoRW425

NameCategorySizeLanguageTimestampD-/B-Number
TÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x und VMx420 Certificates 431.9 KB DE2023/01/1212.01.2023
TÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x and VMx420 Certificates 411.7 KB EN2023/01/1212.01.2023
UKCA - isoxx425 Declarations of Conformity 142.1 KB 2023/06/1212.06.2023
isoXX425 CE Declarations of Conformity 146.2 KB 2023/07/1414.07.2023
isoRW425 Quickstarts 931.7 KB EN2024/01/3030.01.2024D00052
isoRW425 Manuals 4.2 MB EN2023/09/2626.09.2023D00052
isoRW425 Datasheets 284.2 KB EN2020/06/2626.06.2020D00052
Modbus RTU - Monitor isoxx425 V2.2.2 setup Software 7.1 MB 2019/05/1313.05.2019