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Product Overview
The Bender ISOMETER® IRDH275BM-727 is an advanced digital insulation monitoring device designed for ungrounded AC, AC/DC, and DC electrical systems (IT systems).
Equipped with Bender’s patented AMP Plus (Adaptive Measuring Pulse) technology, the IRDH275BM-727 continuously monitors system insulation resistance to ground, automatically adapting to high system leakage capacitances ($C_e$) and system frequency fluctuations (0–460 Hz).
The BM-727 designation indicates a specific functional variant featuring Bender BMS bus communication (RS-485 Modbus / BMS protocol) and specialized system options for industrial automation, power distribution, and marine installations.
Technical Specifications
| Parameter | Specification Details |
| Product Model | IRDH275BM-727 |
| Product Series | ISOMETER® IRDH275 Series |
| Monitored System Type | Ungrounded AC, AC/DC, or DC IT systems |
| Nominal System Voltage ($U_n$) | 0 to 793 V AC / 0 to 650 V DC (expandable to higher voltages with coupling devices like AGH series) |
| System Frequency Range | DC / 1 Hz to 460 Hz |
| Auxiliary Supply Voltage ($U_s$) | AC 88…264 V / DC 77…286 V |
| Insulation Resistance Measuring Range | 1 kΩ to 10 MΩ |
| Response Value ($R_{an}$) | Adjustable setpoints (e.g., Alarm 1: 1 kΩ…10 MΩ; Alarm 2: 1 kΩ…1 MΩ) |
| Max. System Leakage Capacitance ($C_e$) | Up to 500 µF (with automatic adaptation via AMP Plus) |
| Communication / Interfaces |
• RS-485 with Bender BMS Protocol / Modbus RTU • 0/4–20 mA or 0–10 V analog output for insulation measurement |
| Relay Contacts | 2 configurable alarm relays (SPDT / Changeover contacts) |
| Display & Controls | Multi-line backlit LCD display, internal Test/Reset keys |
| IP Degree of Protection | IP30 (Front frame IP54 with transparent cover) |
| Mounting & Dimensions | DIN rail mounting or screw mounting; standard 144 mm panel footprint options |
Key Advantages
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AMP Plus Measuring Principle: Automatically adjusts to high system leakage capacitances and variable frequency drives (VFDs), ensuring fast and reliable fault detection without false alarms.
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Comprehensive AC/DC IT System Coverage: Capable of monitoring pure AC, pure DC, and complex AC systems with downstream rectifiers or VFDs.
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Integrated BMS Bus & Networkability: Enables remote monitoring, parameter assignment, and centralization into SCADA or PLC systems via RS-485 Modbus / BMS communication.
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Dual Adjustable Alarm Relays: Allows two distinct alarm thresholds (e.g., Pre-alarm at 50 kΩ and Main Alarm at 10 kΩ) for early warning before equipment trip or shutdown.
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Continuous Self-Monitoring: Built-in automatic self-test routine checks internal measurement circuits and connection cables to earth and monitored network lines.
Important Usage & Installation Precautions
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Single Insulation Monitor Rule: Never connect more than one insulation monitoring device (ISOMETER®) to the same ungrounded (IT) system simultaneously, as their measuring signals will interfere with each other.
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Coupling Device Requirement for High Voltage: For system voltages exceeding 793 V AC / 650 V DC, an external Bender coupling unit (such as AGH520S or AGH150W) must be connected in series.
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System Grounding Integrity: Ensure the protective earth ($PE$) and system ground connections ($E/KE$) are securely wired with separate lines to guarantee accurate measurement and reliable fault detection.
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Auxiliary Power Matching: Verify that the supply voltage delivered to the auxiliary terminals ($A1/A2$) falls within the specified range of 88–264 V AC / 77–286 V DC.
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Capacitance Limits: Although AMP Plus adapts to high capacitance, total system leakage capacitance ($C_e$) should not exceed 500 µF to maintain fast response times.
Applications
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Marine & Offshore Facilities: Insulation monitoring for shipboard power supply systems, platform distribution networks, and electric propulsion systems.
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Variable Speed Drives (VFDs) & Automation: Protecting complex industrial networks containing inverted drives, power converters, and soft starters.
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Mining & Heavy Industry: Continuous ground-fault detection in underground power grids, excavators, and heavy material handling systems.
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Chemical & Process Industries: Ensuring continuous operational uptime in critical uninterrupted process lines operating on ungrounded IT power networks.
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Critical Power & Energy Storage: Monitoring ungrounded DC battery banks, photovoltaic systems, and UPS distribution systems.
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