Product Description
BENDER IRDH275B-427 is an ISOMETER® insulation monitoring device from IRDH275B series, designed for unearthed IT AC/DC power systems. It adopts Bender patented AMPPlus adaptive measuring pulse principle, continuously monitoring insulation resistance for power networks with non-linear loads such as converters and rectifiers. Equipped with real-time clock for timestamped alarm event memory; galvanically isolated RS485 BMS communication and isolated 0/4…20 mA analog output are standard. It comes with LCD display and operating keys, supports manual & automatic self-test, DIN rail mounting. This unit gives early warning of insulation degradation and prevents single earth faults escalating into short-circuit accidents, widely deployed in industrial safety power supply applications.
Specifications
- Part Number: IRDH275B-427
- Brand: BENDER (Germany)
- Product Type: ISOMETER® Insulation Monitoring Device
- Applicable System: Unearthed IT system, AC / AC+DC 0~793 V; DC 0~650 V
- Measuring Principle: AMPPlus adaptive measuring pulse
- Supply Voltage: 19.2–72 VDC
- Communication: RS485 (BMS protocol, galvanically isolated)
- Analog Output: Isolated 0…20mA / 4…20mA switchable
- Display: LCD with keypad and status LED indicators
- Event Memory: RTC real-time clock, timestamped alarm records
- Relay Output: 2 alarm relay outputs
- Mounting: Standard DIN rail mount
- Housing: Plastic enclosure with front panel operation
- Functions: Auto adaptation to system earth leakage capacitance, manual/auto self-test, adjustable threshold, system isolation control via F1/F2 terminals
- Certifications: CE, compliant with IEC 61557-8
Applications
Continuous insulation monitoring for unearthed IT power distribution networks:
- Medical power supply: Isolated power systems for hospital operating rooms & ICU
- Mining & tunnel: Underground unearthed distribution systems
- New energy: PV and energy storage DC IT systems
- Marine & railway: On-board isolated power supply for vessel and rail transit
- Industrial drives: IT distribution for inverters, rectifier cabinets and large motor drives
- Data centers & chemical plants: High-reliability unearthed power circuits
It continuously measures earth insulation resistance and triggers visual, audible and relay alarms once insulation value drops below threshold. Connectable to PLC/DCS for remote monitoring. Detects cable damage and insulation aging at early stage, protecting personnel and equipment and reducing unplanned outages.
Series Models
IRDH275-427, IRDH275BW-427, IRDH275B-435, IRDH275BM-7, IRDH275W-427, IRDH275-435
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