BENDER IRDH275-435 Insulation Monitoring Device

Product Description

The BENDER IRDH275-435 is an ISOMETER® Insulation Monitoring Device (IMD) designed for continuous monitoring of insulation resistance in ungrounded AC, AC/DC, and DC IT systems. It detects insulation faults between live conductors and earth, helping prevent electrical shock risks, equipment damage, and unexpected system downtime.

The device is suitable for industrial power systems containing rectifiers, converters, inverter drives, thyristor-controlled DC drives, and DC components. It supports systems up to 793 VAC or 650 VDC without an external coupling device.

Detailed Specifications

Advantages & Features

• Continuous insulation resistance monitoring
• Supports AC, DC, and mixed AC/DC networks
• Detects ground insulation faults without interrupting operation
• Suitable for power electronics systems with high leakage capacitance
• AMPPlus measurement technology adapts automatically to system conditions
• Integrated display and control buttons for parameter setting
• 0–400 μA analog output for external monitoring systems
• Compact DIN rail mounting design
• High reliability for critical industrial power systems

Applications

• Industrial Power Distribution Systems
• Automation Control Cabinets
• Frequency Converter Systems
• Servo Drive Systems
• Renewable Energy Equipment
• Marine Electrical Systems
• Medical IT Power Systems
• Mining and Heavy Industry Equipment
• Process Automation Systems

Precautions

• Confirm the system is an ungrounded IT system before installation.
• Check monitored voltage range before connection.
• For systems above 793 VAC / 650 VDC, use a suitable external coupling device.
• Ensure correct grounding and wiring according to the manual.
• Do not disconnect insulation monitoring terminals while the system is energized.
• Installation should be performed by qualified electrical personnel.