BENDER IRDH275B-425 Insulation Monitoring Device | Replacement, Equivalent & Selection Guide
Technical Specifications
- Manufacturer: BENDER GmbH & Co. KG
- Part Number / SKU: IRDH275B-425
- Series: IRDH275 Series
- Function: Insulation Monitoring Device (IMD) for unearthed IT systems
- Nominal System Voltage (Un): AC 0–690 V / DC 0–1000 V
- Response Value (Ran): Adjustable 1 kΩ – 10 MΩ
- Measuring Voltage: DC ≤ 12 V
- Supply Voltage (Us): AC/DC 24–240 V (universal)
- Frequency Range: DC, 0 Hz, 50/60 Hz
- Output Relays: 2 × changeover contacts (fault + alarm)
- Communication Interface: RS-485 (BCOM / Modbus RTU)
- Display: LCD with backlight, insulation value readout
- Protection Class: IP30 (front panel IP40 with cover)
- Operating Temperature: −25 °C to +70 °C
- Mounting: DIN rail (35 mm) or panel mount
- Approvals: IEC 61557-8, UL 61010-1, CE, cULus
- Weight: ~4.46 kg (packaged)
Compatible Replacement & Equivalent Models
When the IRDH275B-425 is unavailable or under evaluation, the following models offer functional equivalence or direct replacement capability:
- BENDER IRDH275-425 — Previous generation without B-variant enhancements; same core IMD function, reduced communication options.
- BENDER ISOMETER® iso685-D-P — Next-generation platform with extended DC range up to 3000 V; suitable for EV charging and solar IT systems.
- BENDER IRDH375 — Enhanced variant with wider voltage range and additional relay outputs; drop-in for high-demand applications.
- Littelfuse / Startco SE-330 — Third-party equivalent for basic IT system insulation monitoring; verify relay logic and communication compatibility before substitution.
- Dold BD5980 — European alternative IMD; compatible with IEC 61557-8 installations; confirm response threshold range matches system requirements.
⚠ Always verify supply voltage, response threshold range, and communication protocol before substituting any IMD in a live IT system.
Why Choose the Original Model
- Certified IT System Compliance: Factory-calibrated to IEC 61557-8 and UL 61010-1 — no field recalibration required.
- Universal Supply Voltage: AC/DC 24–240 V eliminates the need for separate power supplies across global installations.
- RS-485 / BCOM Integration: Native integration with BENDER BMS, COM465, and SCADA systems for real-time insulation trending.
- Wide Impedance Range: 1 kΩ – 10 MΩ adjustable response covers both low-impedance industrial and high-impedance medical IT networks.
- Proven Reliability: Deployed in hospitals, offshore platforms, and data centers where nuisance tripping is unacceptable.
Typical Applications
- Medical IT Systems (IEC 60364-7-710): Operating theaters, ICUs, and MRI suites requiring continuous insulation monitoring without supply interruption.
- Marine & Offshore: Ungrounded shipboard power systems per IEC 60092 and DNV GL requirements.
- Industrial Drives & Inverters: Monitoring insulation integrity of variable-frequency drive (VFD) output circuits and motor windings.
- Renewable Energy: Solar PV string monitoring and wind turbine nacelle IT networks.
- Data Centers & UPS Systems: Continuous monitoring of battery-backed IT distribution without system shutdown.
- Mining & Tunneling: High-humidity underground environments where ground fault detection is safety-critical.
System Compatibility
- Compatible with BENDER BMS (Building Management System) via BCOM protocol
- Modbus RTU over RS-485 — integrates with Siemens, Schneider, ABB, and Rockwell SCADA/PLC platforms
- Works alongside BENDER EDS (Earth Fault Location System) for fault pinpointing after alarm
- Compatible with BENDER COM465 gateway for Ethernet/IP and BACnet bridging
- Suitable for use with isolation transformers rated per IEC 61558-2-15
Selection Guide
| Requirement | Recommended Model |
|---|---|
| Standard industrial IT system, AC/DC universal supply | IRDH275B-425 ✓ |
| Medical IT per IEC 60364-7-710, alarm annunciator needed | IRDH275B-425 + BENDER MK2430 |
| DC systems up to 3000 V (EV, solar) | BENDER iso685-D-P |
| Fault location required after alarm | IRDH275B-425 + BENDER EDS series |
| Budget alternative, basic monitoring only | Dold BD5980 (verify specs) |
Quality Assurance & Sourcing
- All units sourced from authorized BENDER distributors or verified OEM channels
- Each device inspected against BENDER factory test records prior to shipment
- Serialized traceability — batch and date code documentation available on request
- Konmask.com specializes in industrial automation and safety components for B2B buyers
- Export packing with anti-static protection and moisture barrier for international logistics
How to Order
- Part Number: IRDH275B-425
- Brand: BENDER
- Add to cart directly or contact us for volume pricing, lead time, and datasheet
- OEM, EPC, and MRO procurement inquiries welcome
- Expedited shipping available for critical maintenance requirements
Replacement & Compatibility FAQ
Q: Can the IRDH275B-425 replace an older IRDH275-425 directly?
A: Yes, the B-variant is backward-compatible in mounting and wiring. The RS-485 communication interface is an added feature not present on the original IRDH275-425.
Q: Is this device suitable for DC systems in solar installations?
A: The IRDH275B-425 supports DC up to 1000 V, making it suitable for most residential and commercial PV IT systems. For utility-scale DC above 1000 V, specify the iso685-D-P.
Q: What is the difference between IRDH275B-425 and IRDH375?
A: The IRDH375 offers a wider nominal voltage range and additional relay outputs. The IRDH275B-425 is the preferred choice for standard industrial and medical IT systems within its rated voltage range.
Q: Does Konmask provide a certificate of conformity?
A: Yes. A certificate of conformity and, where available, the original BENDER factory test report can be provided upon request.
Q: What is the typical lead time?
A: In-stock units ship within 1–3 business days. For out-of-stock items, contact us for current lead time from our supply chain.
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