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 guideProduct families / Insulation monitoring · IMD / ISOMETER® isoHV425 + AGH422
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Bender ISOMETER® isoHV425 + AGH422Insulation Monitoring Device (IMD)
Insulation and voltage monitoring combination for IT systems up to AC/DC 1000 V with AGH422 coupling device.
TECHNICAL SUMMARY
Features that distinguish this model.
Control and auxiliary circuits
- With AGH422: 3(N)AC, AC/DC 0…1000 V or DC 0…1000 V.
- Two independent alarm thresholds: 10…500 kΩ; maximum leakage capacitance 150 µF.
- isoHV425-D4-4: BMS, Modbus RTU and IsoData via isolated RS-485.
- isoHV425-D4M-4: galvanically isolated analogue output.
FROM PRODUCT TO TECHNICAL KNOWLEDGE
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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
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Model options and technical values
| Model | Supply voltage U S | Nominal voltage U n | Version | Order code |
|---|---|---|---|---|
| isoHV425-D4-4 with AGH422 | AC 100…240 V, 47…63 Hz/DC 24…240 V | AC-, 3(N)AC, DC 0…1000 V | Serial interface | B71036501 |
| isoHV425W-D4-4 with AGH422W | AC 100…240 V, 47…63 Hz/DC 24…240 V | AC-, 3(N)AC, DC 0…1000 V | Serial interface | B71036501W |
| isoHV425-D4M-4 with AGH422 | AC 100…240 V, 47…63 Hz/DC 24…240 V | AC-, 3(N)AC, DC 0…1000 V | Analogue output | B71036503 |
| isoHV425W-D4M-4 with AGH422W | AC 100…240 V, 47…63 Hz/DC 24…240 V | AC-, 3(N)AC, DC 0…1000 V | Analogue output | B71036503W |
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
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6 / 6 documents
Datasheet
isoHV425
isoHV425_D00082_D_XXEN.pdfTechnical summary source · pp. 1, 2Open document ↗Operating manualisoHV425
isoHV425_D00082_M_XXEN.pdfOpen document ↗Conformity documentisoXX425
CEKO_isoXX425.pdfOpen document ↗Conformity documentUKCA - AGH
UKCA_AGH.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
This summary is based on product descriptions and features on the specified pages of the documents above. Consult the manufacturer document for complete technical values, connection information and ordering options.
Current product and variant information · 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 ↗
APPLICATIONS
Its role in your application.
Tracks insulation resistance, leakage capacitance and system voltage together in AC/DC circuits with high system voltages. It also measures conductor-to-PE DC voltages to support assessment of insulation conditions.
IN THE SAME APPLICATION GROUP
