Products

Innovative technologies for safe handling of electrical power to achieve high availability

We offer you first-class quality and safety combined with global service and every support in resolving your monitoring problems.

ISOMETER® isoRW425

ISOMETER® isoRW425

  • Insulation 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® monitors the insulation resistance (R mode) or the insulation impedance (Z mode) of unearthed AC/DC main circuits (IT systems) with nominal system voltages of 3(N)AC, AC, AC/DC or DC 0…440 V. DC components existing in 3(N)AC, AC/DC systems do not influence the operating characteristics when a minimum load current of DC 10 mA flows. Due to the separate supply voltage, de-energised systems can also be monitored. The maximum permissible system leakage capacitance Ce is 300 μF in R mode and 1μF in Z mode.

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

CategoryNameSizeLanguageTimestampD-/B-Number
Certificates TÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x und VMx420 431.9 KB DE2023/01/12 14:46:3012.01.2023 14:46:30
Certificates TÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x and VMx420 411.7 KB EN2023/01/12 14:46:3512.01.2023 14:46:35
CE Declarations of conformity isoXX425 151.9 KB 2023/01/09 06:50:5109.01.2023 06:50:51
Quickstarts isoRW425 657.3 KB DE2019/05/13 10:31:5713.05.2019 10:31:57D00052
Quickstarts isoRW425 651.1 KB EN2019/05/13 10:31:5713.05.2019 10:31:57D00052
Manuals isoRW425 2.5 MB DE2021/04/20 08:07:5320.04.2021 08:07:53D00052
Manuals isoRW425 2.5 MB EN2021/04/20 08:09:3320.04.2021 08:09:33D00052
Manuals isoRW425 1.2 MB ES2019/05/13 10:31:5413.05.2019 10:31:54D00052
Datasheets isoRW425 284.1 KB DE2020/06/26 10:21:0726.06.2020 10:21:07D00052
Datasheets isoRW425 284.2 KB EN2020/06/26 10:21:1426.06.2020 10:21:14D00052
Datasheets isoRW425 314.8 KB ES2020/06/26 10:21:2226.06.2020 10:21:22D00052
Datasheets isoRW425 511.6 KB ZH2019/05/13 10:31:3313.05.2019 10:31:33D00052
Software Modbus RTU - Monitor isoxx425 V2.2.2 setup 7.1 MB 2019/05/13 10:31:5913.05.2019 10:31:59