Description
The BENDER IRDH275BM-727 A-ISOMETER Insulation Monitoring Device (B91065120) is an advanced insulation monitoring unit designed for unearthed AC, AC/DC, and DC IT power systems. It continuously monitors insulation resistance between live conductors and earth, helping improve electrical safety and system availability in industrial and marine power applications.
The IRDH275BM-727 uses Bender AMPPlus measuring technology and supports applications including drives with converters, rectifiers, and DC systems. It provides alarm monitoring, insulation fault detection, communication functions, and diagnostic information through its integrated display and BMS interface.
IRDH275BM-727
🔹 Product Parameters
| Parameter | Description |
|---|---|
| Brand | BENDER |
| Model | IRDH275BM-727 |
| Series | A-ISOMETER IRDH275 Series |
| Product Name | Insulation Monitoring Device |
| Part Number | B91065120 |
| Origin / Place of Origin | Germany |
| Product Status | Used / Industrial Spare Part |
| Dimensions | Approx. 100 × 160 × 75 mm |
| Weight | Approx. 0.52 kg |
| Power | DC 19.2–72 V / Approx. 8 VA |
| Discontinued | No, legacy model available through replacement channels |
🔹 Technical Features
⚡ Designed for insulation monitoring of unearthed AC, AC/DC, and DC IT systems.
⚡ Suitable for systems with rectifiers, converters, and variable-speed drives.
⚡ Uses AMPPlus measurement method for stable insulation resistance measurement.
⚡ Two adjustable response values from 100 kΩ to 10 MΩ for pre-warning and alarm monitoring.
⚡ Integrated BMS interface with electrically isolated RS-485 communication.
⚡ Provides alarm relay outputs, self-test function, history memory, and LCD display monitoring.
⚡ Suitable for marine power systems, industrial plants, automation equipment, and critical electrical installations.
🔹 Common Questions & Answers
Q: What is the main function of the BENDER IRDH275BM-727?
A: It monitors insulation resistance in unearthed power systems and detects insulation faults before they cause electrical failures or safety risks.
Q: What applications use the IRDH275BM-727?
A: It is commonly used in marine electrical systems, industrial power networks, drives with converters, and DC control systems.
Q: What is the operating power supply range?
A: The device operates with DC 19.2–72 V supply voltage.
Q: What communication interface does this device support?
A: The IRDH275BM-727 supports the Bender Measuring Device Interface (BMS) through electrically isolated RS-485 communication.
Q: What are common failure symptoms of this insulation monitor?
A: Typical issues include insulation alarm activation, communication loss, incorrect resistance readings, display problems, or relay output faults.
Q: What should be checked before replacing the IRDH275BM-727?
A: Confirm system voltage range, IT network configuration, communication settings, alarm parameters, wiring connections, and replacement model compatibility.
Q: Can the IRDH275BM-727 monitor DC systems?
A: Yes. The IRDH275 series supports AC, AC/DC, and DC IT system insulation monitoring applications.
🔹 Recommended BENDER Models
- BENDER IRDH275BM-727 A-ISOMETER Insulation Monitoring Device
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