Description
Bender IRDH575B2W-435 | ISOMETER Insulation Monitor
Product Introduction
High-voltage unearthed power systems require insulation monitoring matched to the actual operating voltage—not just a device from the same product family. The Bender IRDH575B2W-435 ISOMETER is the B2 high-voltage variant of the IRDH575 insulation monitoring platform, designed for continuous insulation-resistance monitoring and support for selective insulation fault location.
The IRDH575B2W-435, article B91065503W, is specified for 340–760 VAC and 340–575 VDC monitored systems. Its BMS functionality supports communication with compatible Bender devices, while the W option provides increased resistance to shock, vibration, and moisture through special electronics coating. It is a configuration-specific replacement component; confirm the monitored voltage, auxiliary supply, BMS/EDS architecture, and full nameplate before ordering.
IRDH575B2W-435
Key Technical Specifications
- Manufacturer: Bender
- Model: IRDH575B2W-435
- OEM Article Number: B91065503W
- Product Series: ISOMETER IRDH575
- Device Function: Insulation-resistance monitoring
- Monitored System Type: Unearthed AC, 3(N)AC, and DC systems
- B2 AC System Voltage: 340–760 VAC
- B2 DC System Voltage: 340–575 VDC
- Auxiliary Supply (AC): 88–264 VAC
- Auxiliary Supply (DC): 77–286 VDC
- Auxiliary Supply Frequency: 42–460 Hz
- Response Value Range: 1 kΩ–10 MΩ
- Alarm Thresholds: Two independently adjustable response values
- Communication Interface: RS-485 / BMS protocol
- Relay Outputs: Three changeover contacts for Alarm 1, Alarm 2, and device error / selectable EDS alarm
- Insulation Fault Location: Integrated test generator/controller for compatible EDS systems
- Maximum System Leakage Capacitance: 500 μF
- W Option: Increased shock and vibration resistance; improved moisture resistance through special electronics coating
- Protection Rating: IP30 internal components / IP20 terminals; higher door-mounted protection requires specified accessories
Specifications are based on Bender IRDH575 documentation. Verify the physical nameplate and applicable manual revision before using these values as commissioning criteria.
Global Sourcing & Live-Test SOP
For a surplus IRDH575B2W-435, verification should cover both the high-voltage monitoring range and the W-rated variant. A matching front panel alone is not enough to establish configuration or operational condition.
Inbound Verification
- Confirm the complete IRDH575B2W-435 model marking.
- Verify OEM article number B91065503W, where present.
- Photograph the nameplate, front panel, terminals, and enclosure.
- Record serial number and hardware revision, where available.
- Inspect the housing, display, keys, and terminal areas for damage or corrosion.
- Check for signs of moisture ingress, coating damage, or unauthorized repair.
Authenticity and Configuration Review
- Compare the nameplate and article number against Bender documentation.
- Verify the auxiliary supply range before applying power.
- Confirm the monitored system voltage is within the B2 variant’s limits.
- Identify BMS wiring and any connected EDS equipment.
- Confirm the W option from the full model marking; do not infer it from appearance.
Functional Validation
- Energize only with a verified compatible auxiliary supply.
- Check startup, display operation, and available self-test functions.
- Test insulation-monitoring response using an appropriate controlled setup.
- Verify alarm relay operation and configured response thresholds.
- Verify BMS communication where suitable equipment is available.
- Test EDS-related functionality only with compatible equipment and configuration.
- Record test setup, settings, measured response, and results.
- Do not claim calibration or functional testing unless it has actually been performed and documented.
Extended Test and Shipment
- If extended testing is performed, record its duration and operating conditions.
- Document test date, supply voltage, alarm behavior, and communication status.
- Protect the device from impact, moisture, and contamination during shipment.
- Use protective packaging suitable for electronic instrumentation.
- Include only accessories explicitly identified in the sale.
Field Engineer’s Pitfall Guide
- ❗ Do not confuse B2 with B1. The B2-435 monitors 340–760 VAC and 340–575 VDC systems. The B1-435 has a different monitored-voltage range. Match the complete suffix to the actual electrical system.
- ❗ The auxiliary supply is separate from the monitored voltage. The documented auxiliary supply is 88–264 VAC or 77–286 VDC. Verify the supply marking independently before energizing the unit.
- ❗ W-rated does not mean waterproof. The W option improves resistance to shock, vibration, and moisture through special electronics coating. It does not replace enclosure protection or installation requirements.
Intent-Driven FAQ
What is the Bender used for?
It monitors insulation resistance in compatible unearthed AC/DC systems and supports insulation fault location with compatible EDS equipment.
What is the OEM article number?
The documented article number is B91065503W.
What system voltage can the monitor?
The B2-435 variant is specified for 340–760 VAC and 340–575 VDC systems.
What auxiliary supply does it require?
The documented auxiliary supply is 88–264 VAC or 77–286 VDC. Confirm the physical nameplate before applying power.
What does the W suffix mean?
The W option provides increased resistance to shock and vibration and improved moisture resistance through special electronics coating.
Does the support BMS communication?
The IRDH575 platform supports RS-485/BMS communication. Confirm the installed configuration and network settings during replacement.
What should I verify before purchasing a surplus unit?
Confirm the complete model and article number, monitored-system voltage, auxiliary supply, W-option marking, terminal condition, and documented test status. Verify warranty and included accessories with the seller.
Procurement Note
This listing describes the documented Bender , article B91065503W. It does not imply that a specific surplus unit has been tested, calibrated, or supplied with a warranty. Confirm physical condition, included accessories, and test status before publishing.
