ABB CM-IWN-AC Insulation Monitoring Relay

• 1. Product Overview

  ABB CM-IWN-AC Insulation Monitoring Relay is designed for continuous insulation monitoring of AC power systems in IT networks. It continuously measures the insulation resistance between live conductors and earth. When the insulation resistance falls below a preset threshold, the relay activates an alarm output, allowing early fault detection without interrupting power supply.

  This device is especially suitable for applications where power continuity and safety are critical.

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  2. Main Technical Data

  General

  • System type:
    IT systems (unearthed or impedance-earthed systems)

  • Monitoring function:
    Insulation resistance to earth

  • Rated system voltage:
    AC systems (typically low-voltage AC applications)

  • Frequency:
    50 / 60 Hz

  Insulation Monitoring

  • Monitoring mode:
    Continuous online insulation monitoring

  • Alarm threshold:
    Adjustable insulation resistance setpoint

  • Response:
    Alarm triggered when resistance drops below the set value

  • Interference immunity:
    Designed to tolerate system leakage capacitance and operational disturbances

  Outputs and Indication

  • Output contacts:
    Changeover relay contact (NO / NC)

  • Output function:
    Alarm and system status signaling

  • Indication:
    LED indicators for power, alarm, and fault status

  Power Supply and Installation

  • Auxiliary supply:
    Wide-range auxiliary power input

  • Mounting:
    DIN rail mounting

  • Housing:
    Industrial modular enclosure

  • Protection:
    Suitable for industrial control environments

  Standards and Reliability

  • Compliance:
    IEC / EN standards for insulation monitoring and control devices

  • Operating conditions:
    Designed for continuous industrial operation

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  3. Key Advantages and Features

  1. Improved Power Availability
     Detects first insulation faults without shutting down the system.

  2. Enhanced Safety
     Early warning of insulation deterioration reduces risks to personnel and equipment.

  3. Continuous Monitoring
     Real-time supervision without affecting normal operation.

  4. Adjustable Alarm Levels
     Flexible settings for various system sizes and applications.

  5. Industrial-Grade Reliability
     Stable operation in harsh electrical environments.

  6. Easy Installation and Maintenance
     Compact DIN-rail design with clear wiring layout.

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  4. Typical Applications

  • Industrial automation and process control

  • Oil, gas, and chemical plants

  • Medical facilities (e.g. operating rooms, medical IT systems)

  • Mining, tunnels, and underground installations

  • Marine and offshore systems

  • Data centers and critical infrastructure

  • Power plants and auxiliary power systems

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  5. Installation and Application Notes

  1. For IT systems only
     Not suitable for TN or TT systems.

  2. Correct wiring is essential
     Monitoring terminals must be properly connected to the system and earth.

  3. Proper alarm setting
     Adjust the alarm threshold according to system size, cable length, and environment.

  4. Avoid unintended grounding
     Accidental earth connections can affect monitoring accuracy.

  5. Regular functional testing
     Periodic tests are recommended to ensure reliable alarm operation.

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The structure and details of the product：

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