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® IR420-D4
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BENDER DISTRIBUTOR IN TÜRKİYE · ADEO TEKNİK
Bender ISOMETER® IR420-D4Insulation Monitoring Device (IMD)
Compact device monitoring insulation resistance in unearthed AC control circuits from 0…300 V.
TECHNICAL SUMMARY
Features that distinguish this model.
Control and auxiliary circuits
- Designed for AC 0…300 V IT control circuits.
- Two independent alarm thresholds and two alarm relays, each with a changeover contact.
- System/earth connection monitoring; internal or external test/reset.
- Multifunction LC display, adjustable alarm delay and 36 mm enclosure.
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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4 / 4 options
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Model options and technical values
| Model | Nominal system voltage* U n | Supply voltage* U S | Alarm threshold R an | System leakage capacitance C e | Order code** |
|---|---|---|---|---|---|
| IR420-D4-1 | AC 0…300 V, 42…460 Hz | DC 9,6…94 V / / AC 16…72 V, 42…460 Hz | 1…200 kΩ | < 20 µF | B71016409 / B91016409 |
| IR420-D4-2 | AC 0…300 V, 42…460 Hz | DC 70…300 V / / AC 70…300 V, 42…460 Hz | 1…200 kΩ | < 20 µF | B71016405 / B91016405 |
Manufacturer table notes (original language):
* absolute values **(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
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3 / 3 documents
Datasheet
IR420-D4
IR420-D4_D00037_D_XXEN.pdfTechnical summary source · pp. 1, 2Open document ↗Conformity documentIR42x
CEKO_IR42x.pdfOpen document ↗Conformity documentUKCA - IR42x
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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 ↗
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APPLICATIONS
Its role in your application.
Signals insulation deterioration as prewarning and alarm in machinery, automation, lift and power-plant control circuits. De-energised circuits can also be monitored when a separate supply is used.
IN THE SAME APPLICATION GROUP
