Schneider Electric Vigilohm IM9 Insulation Monitoring Relay

Description

The Schneider Electric IMD-IM9, part of the Vigilohm series, is an insulation monitoring device for IT (ungrounded) electrical systems. It provides continuous monitoring of the network's insulation resistance to ground, triggering an alarm when the resistance drops below a user-defined threshold. This essential safety device helps prevent electric shock hazards and fire risks, ensuring operational continuity for critical power systems.

Specifications

• Manufacturer: Schneider Electric
• Type: IMD-IM9
• Reference Number: QZ13333
• Product Range: Vigilohm
• Monitored Network Voltage [Un]: 0 to 480V AC (45-440 Hz), 0 to 480V DC
• Auxiliary Supply Voltage [Us]: 110 to 415V AC (45-440 Hz), 125 to 250V DC
• Alarm Resistance Range: 1 to 500 kOhm (adjustable)
• Time Delay: 1 to 10 seconds (adjustable)
• Output Relay: 1 C/O contact
• Mounting: DIN Rail

Label Info

• Alarm Threshold: Adjustable via front dial
• Time Delay: Adjustable via front dial
• Operating Mode: Standard or Fail-safe, selectable
• Indicators: ON (green LED), Alarm (red LED)

Application

Ideal for use in industrial plants, hospitals (operating rooms), data centers, and marine applications where power continuity and electrical safety are paramount. It is specifically designed for AC and DC IT networks.

Country of Origin

Made in China.

CO2 Impact

Opting for a refurbished unit like this saves approximately 8.8 kg of CO2 emissions compared to purchasing a new one. This is equivalent to the CO2 absorbed by a mature tree in a year.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

The IMD-IM9 is specifically designed for ungrounded IT (Isulated Terra) electrical systems, both AC and DC, where the neutral is not connected to earth.

Yes, the device has a switch on the front panel that allows you to select between 'Std' (Standard) and 'Fail safe' operating modes for the output relay.

The adjustable time delay (T(s)) prevents nuisance alarms or tripping caused by brief, transient drops in insulation resistance, ensuring the alarm only triggers for sustained faults.

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Last Update: Friday, March 13, 2026