
ISOMETER® IR425-D4
Insulation monitoring device for 0…300 V AC/DC IT control circuits containing DC components.
Control and auxiliary supplies are separate circuits that support continuity of the main energy flow. Bender’s brochure considers measurement coordination and insulation information together for IT supplies, coupled systems and UPS circuits.
Bender distributor in Türkiye · ADEO Teknik

Control voltage, UPS supplies and three-phase distribution circuits create different monitoring duties. Bender product families address these through measurement and alarm functions.
Start with models selected for the application’s measurement and monitoring duties; other products and accessories appear in the complete list below.

Insulation monitoring device for 0…300 V AC/DC IT control circuits containing DC components.

For identifying the feeder containing an insulation fault in control circuits.
Compare all related products ↓ · Product selection and quotations from the distributor ↗
Control and auxiliary supplies are separate circuits that support continuity of the main energy flow. Bender’s brochure considers measurement coordination and insulation information together for IT supplies, coupled systems and UPS circuits.
Related brochure section · PDF p. 6 ↗
IT auxiliary circuits, voltage and earthed sub-distribution are monitored by separate products in substations.
After choosing a product family for the application, compare the model’s measurement scope, accessory compatibility and communication options on its detail page.
Explore related Bender models ↓The explanation, Bender’s relevant sector publication and official application page form the basis of this content. The image is presented in its original form from the source brochure.

Official Bender manufacturer publication
Open brochure PDF ↗Download PDF ↓Bender source document ↗
Original publication: Electrical Protection Selection Guide
Bender manufacturer publication · US / North American edition
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Original publication: Bender Industry Applications
Bender manufacturer publication · US / North American edition
Open brochure PDF ↗Download PDF ↓Bender source document ↗
Original publication: CEP - Central earthing Point
Sector publication from Bender’s official download centre
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Original publication: High-Resistance and Low-Resistance Grounding Systems
Bender manufacturer publication · US / North American edition
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Original publication: System Grounding in the Americas, Australia, South Africa and Other Regions
Sector publication from Bender’s official download centre
Open brochure PDF ↗Download PDF ↓Bender source document ↗
Original publication: Flexible system communication
Sector publication from Bender’s official download centre
Open brochure PDF ↗Download PDF ↓Bender source document ↗Product families fulfil different measurement and notification duties. The model’s full scope and required components are identified in the relevant technical source.
BENDER PRODUCT FAMILYApplication-specific ISOMETER® insulation monitoring devices for IT systems.
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BENDER PRODUCT FAMILYProducts for monitoring voltage, current, frequency, phase and loop resistance.
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BENDER PRODUCT FAMILYTracking electrical quantities, energy consumption and power quality indicators.
Explore related products ↗You can request product information, manufacturer documentation and a supply quotation for this application.
Get product information for your application ↗IT auxiliary circuits, voltage and earthed sub-distribution are monitored by separate products in substations.

Relay using analogue technology to monitor undervoltage/overvoltage in three-phase AC circuits for power-plant applications.

Energy storage module helping the VMD258 voltage relay complete its configured response delay during a supply interruption.

Insulation monitoring device for 0…300 V AC/DC IT control circuits containing DC components.

For identifying the feeder containing an insulation fault in control circuits.

RCMS variant with LED indication and a separate alarm contact for each of its 12 measurement channels.

Voltage, current, power and energy measurement; THD and harmonic indicators up to the 31st order.

AC/DC-sensitive measuring current transformer series comprising a CTBC core and electronic module.

Fault location in main circuits with six integrated measuring current transformers.

Insulation fault location in IT systems with six integrated measurement channels.

Portable insulation fault location in IT systems, with a separate residual current measurement function for TN/TT systems.


Insulation monitoring for inverter applications and large industrial installations.

Residual current monitor with 12 channels and a local graphic display, supporting multi-device monitoring via BMS.

RCMS460 variant with channel alarm LEDs and BMS address indication for 12-channel systems.

Monitoring device offering 12-channel residual current monitoring with the appropriate measuring current transformers.
Explore all options in the relevant family. Assess model selection alongside system topology, voltage, measurement requirements and accessory compatibility.
Measuring and monitoring relaysCompare 14 products / series in this family ↗
Insulation monitoring · IMDCompare 30 products / series in this family ↗
Insulation fault locationCompare 5 products / series in this family ↗
Residual current monitoringCompare 18 products / series in this family ↗
Power quality and energy meteringCompare 2 products / series in this family ↗
Measuring current transformersCompare 10 products / series in this family ↗As Bender’s distributor in Türkiye, ADEO Teknik provides technical product information and quotation support for model and accessory selection, manufacturer documentation and product supply.
Manufacturer document · English
Manufacturer document · English
Manufacturer document · English
Images and application content: official Bender sources. The relevant documents identify the exact model, variant and operating conditions.
Explore product group introductions and original manufacturer brochures with ADEO Teknik, Bender’s distributor in Türkiye.
Insulation monitoring · IMDIn an IT system, live conductors are not directly connected to earth. Behaviour during the first insulation fault is assessed alongside the system configuration, leakage capacitances and protection arrangement.Read the product group guide ↗
Measuring and monitoring relaysVoltage and frequency, current and protective conductor loop monitoring are different tasks. Relay selection starts with the quantity to be monitored.Read the product group guide ↗
Power quality and energy meteringMain distribution, subdistribution and load levels are monitored according to the installation configuration. Multiple measuring points help assess the source of a change.Read the product group guide ↗
Insulation fault locationThe locating current injector, suitable measuring current transformers and EDS evaluator must be considered together.Read the product group guide ↗
Residual current monitoringDetecting sinusoidal AC, pulsating DC and smooth DC components requires different sensor and evaluator configurations. Choose A/F or B/B+ according to the application's current waveform.Read the product group guide ↗
Measuring current transformersType A is considered for alternating and pulsating direct currents; suitable Type B sensors are assessed where smooth DC components must also be measured.Read the product group guide ↗Contact your distributor in Türkiye for product selection, technical documents and quotations.