The Bender IRDH275B A-ISOMETER® is an advanced insulation monitoring device (IMD) designed for continuous monitoring of insulation resistance in IT (unearthed) power systems.

It provides reliable detection of insulation faults, ensuring maximum safety and system availability in critical electrical installations. The device continuously measures insulation resistance and triggers alarms when threshold values are exceeded.

⚡ Electrical Specifications

• Rated insulation monitoring range: 1 kΩ … 10 MΩ
• Rated voltage:
  • AC: 3 AC / AC 0…793 V
  • DC: 0…650 V
• Supply voltage:
  • AC: 88…264 V
  • DC: 77…286 V
• Power consumption: approx. 8 VA

🔋 Monitoring & Control Functions

• Continuous insulation resistance monitoring
• Adjustable response values
• Visual indication via integrated display
• Alarm signaling for insulation faults
• Built-in TEST, RESET, MENU, INFO functions

🛡️ Protection & Safety

• Early detection of insulation degradation
• Increased system safety and uptime
• Relay outputs for alarm signaling
• Suitable for critical and industrial environments
• CE marked

⚙️ Construction Features

• Model: IRDH275B-49335
• Series: A-ISOMETER® IRDH275
• Manufacturer: Bender
• DIN rail mounting
• Robust industrial housing
• Integrated LCD display
• Front panel with control buttons

🔌 Connections

• Multiple screw terminals for system integration
• Relay outputs: AC 250 V / 5 A
• Interfaces for monitoring and signaling circuits
• Clearly labeled terminal layout

🏭 Applications

• IT power systems (unearthed systems)
• Industrial plants
• Hospitals and medical locations
• Photovoltaic and energy systems
• Critical infrastructure and safety systems

💡 Note

A high-reliability insulation monitoring device designed for continuous operation in critical systems, ensuring early fault detection and preventing unexpected downtime.