BENDER IRDH375

Technical Specifications:

• System Type: AC, DC and mixed AC/DC IT systems
• Rated System Voltage: Up to 793 V AC / DC
• Measuring Principle: Pulse measuring method
• Measurement Range: 0 Ω to 10 MΩ
• Relay Outputs: Alarm relay contacts
• Communication: Modbus RTU interface
• Power Supply: 24 VDC
• Operating Temperature: -20 °C to +60 °C

Functional Features:

• Continuous insulation resistance monitoring of IT networks
• Adjustable pre-alarm and fault alarm thresholds
• Automatic self-test function
• Memory storage for fault history and insulation trend data
• Modbus RTU for remote data access and system integration
• Response time adjustable according to system capacitance
• Separate warning and fault relay outputs

Application Scenarios:

• Medical isolated power systems (hospitals operating rooms)
• Marine IT power distribution systems
• Mining underground power networks
• EV charging station isolated supply
• Industrial UPS unearthed power systems

Performance Parameters:

• High immunity to system leakage capacitance
• Insulation resistance measurement accuracy
• Event timestamp for fault logging

Structure Characteristics:

• DIN rail mounted plastic enclosure
• Front panel LCD display for insulation value reading
• Push buttons for parameter configuration
• LED status indicators for alarm and operating state

Installation Requirements:

• Mount on standard DIN rail inside electrical cabinet
• Connect measuring wires according to wiring diagram
• Avoid long measuring cable runs near high frequency interference sources
• Set alarm thresholds according to local electrical code

Notes:

• Do not use in earthed TN or TT power systems
• Perform commissioning test after installation
• Calibrate periodically to maintain measurement accuracy