How does an insulation monitoring device (IMD) work?
Explore insulation resistance measurement, the Riso alarm and the relationship between measurement method and system.
Read the technical guideOfficial Bender product image
BENDER DISTRIBUTOR IN TÜRKİYE · ADEO TEKNİK
Bender ISOMETER® isoRW425Insulation Monitoring Device (IMD)
Insulation monitoring device for railway applications.
- Designed for rolling-stock control circuits within the scope of EN 50155.
- Insulation monitoring in AC and DC IT systems.
- Insulation impedance measurement at 50 Hz or 60 Hz (Z mode).
A CLOSER LOOK AT THE PRODUCT
Technical specifications and functions.
Insulation monitoring device for railway applications. When selecting, consider nominal values, supply options and required system components together.
Bender official product source ↗- Designed for rolling-stock control circuits within the scope of EN 50155.
- Insulation monitoring in AC and DC IT systems.
- Insulation impedance measurement at 50 Hz or 60 Hz (Z mode).
- Adaptation to system leakage capacitances up to 300 µF.
- RMS system voltage measurement with undervoltage/overvoltage detection.
FROM PRODUCT TO TECHNICAL KNOWLEDGE
All technical guides ↗Related technical guides
Explore the product's function and its system's operating principle through technical explanations.
What is an insulation monitoring device (IMD)?
Progress from system type, voltage, leakage capacitance and application conditions to selecting a suitable IMD.
Read the technical guideSystem leakage capacitance and measuring methods in IMD selection
Learn how leakage capacitance and power electronics affect measurement methods and device selection.
Read the technical guideADEO Teknik · Bender distributor in Türkiye
Ask ADEO Teknik Technical product information and supply support for model selection, compatible components and current manufacturer documentation.
MODEL, ORDER AND ACCESSORY INFORMATION
Compare all options in the series.
Assess the option for your application using model names, order codes and technical values. Accessories appear in separate tables.
3 / 3 options
No options match your search. Change the model name or order code.
Model options and technical values
| Model | Nominal system voltage U n | Supply voltage U S | Order code* |
|---|---|---|---|
| isoRW425-D4W-4 | 3(N)AC, AC 0…440 V/DC 0…440 V, 15…460 Hz | DC 24…240 V / AC 100…240 V, 47…63 Hz | B71037000W / B91037000W |
Manufacturer table notes (original language):
*(B7… = push-wire terminal / B9… = screw-type terminal)
Explore compatible accessories
Compatible accessories · 1
| Model | Order code |
|---|---|
| Mounting clip for screw mounting (one piece per device) | B98060008 |
| Mounting frame XM420 | B990994 |
Based on tables on the manufacturer's current product page. For marked-value footnotes, connection conditions and variant suitability, review Bender product source ↗ and the technical documents together. Listing an order code does not commit to stock availability or delivery time.
BENDER MANUFACTURER DOCUMENTS
Access technical documentation in one place.
Find product and accessory documents by type or file name. Language and file information appear beside each document.
5 / 5 documents
Datasheet
isoRW425
isoRW425_D00052_D_XXEN.pdfOpen document ↗Operating manualisoRW425
isoRW425_D00052_M_XXEN.pdfOpen document ↗Conformity documentisoXX425
CEKO_isoXX425.pdfOpen document ↗Conformity documentUKCA - isoxx425
UKCA_isoXX425.pdfOpen document ↗Other technical documentsTÜV NORD - isoHV42x, AGH42x, isoHV52x, isoRW42x and VMx420
Z_BS3.20170626.134319_Bender_Messrelais_en.pdfOpen document ↗No documents match your search. Change the search or document type.
About manufacturer sources
Data sheets and operating manuals open Bender’s official PDFs in a new tab. Documents are in English.
Other languages, accessory documents and current revisions · Bender ↗
Data sheets, operating manuals and related manufacturer documents. File names identify the model or accessory; documents retain their original language.
ADEO Teknik · Bender's distributor in Türkiye. Current Bender product source ↗
Insulation monitoring devices · IMD
