Insulation Monitoring Device ISOLGUARD HIG99

Address: HAKEL spol. s r. o., Bratri Stefanu 980, 500 03 Hradec Kralove, Czech Republic Phone: +420 494 942 300 Connect: Website: View website Contact: Contact supplier View: View supplier Download: Download


Insulation Monitoring Device


The insulation monitoring device, type ISOLGUARD HIG99, is designed for monitoring the insulation status of single-phase, multiphase and direct ungrounded IT power supply systems. Device is also able to monitor combined IT power supply systems, type AC/DC according to standard IEC 61557-8. HIG99 is mainly designed for use on rail vehicles and industrial systems containing rectifiers, inverters and frequency converters.

Maximum operating voltage of monitored IT power supply system is 1 000 V DC / 710 V AC. Device is directly connected to the monitored IT power supply system, no additional inductor is needed.

This device is also equipped with a blocking function thanks to which it is possible to disconnect HIG99 from the monitored system.

HIG99 monitors two insulation status’s critical levels, it is equipped with signalling diodes for local status of the device and IT power supply system signalization. Local signalization is complemented by a pair of switching relays for IT power supply fault status signalization. It is possible to realize remote signalization using communication module type HIG99 KM by CAN interface with CAN OPEN protocol.

Using the CAN communication module, numerical information on the status and value of the insulation resistance can be read, the device’s settings can be checked and changed or test cycles can be performed.

HIG99 basic characteristics:

  • Insulation monitoring device for AC, DC, AC/DC systems with 9 to 1000 V DC / 710 V AC voltage, direct or with 10 – 440 Hz frequency.
  • Device is designed for use on rail vehicles and industrial systems containing rectifiers, inverters and frequency converters.
  • Device is powered from an independent 24 V DC power supply.
  • Loss of connection indication with the measured power supply system and the ground.
  • Automatic internal test for unfunctional device detection.
  • Device evaluates two insulation resistance critical limits.
  • Two monitored power supply system’s insulation resistance status signalling relays with switching contact for two insulation resistance critical limits.
  • Option to start device test by push-button on the module.
  • Option to connect communication module, type HIG99 KM, for device’s connection to master bus-bar system.
  • Option to set critical values, hysteresis values and other parameters by KM type module.
  • HIG99, in connection with any HIG99 KM module, is 9TE (158 mm) wide and is designed for assembling on 35 mm DIN rail.

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