Article number: 70 926
  • The HIG91, HIG92, HIG93, and HIG94 series are a series of insulation monitoring devices for industrial isolated systems (IT systems).
  • The maximum operating voltage of the IT system is 275 V AC. This voltage can be increased up to 6 kV when using coupling devices from the TL series.
  • IMD with one Ran error level (HIG91, HIG92 series) or monitors with two error levels (HIG93, HIG94 series) are available.
  • As standard, the IMD measure Rf in the range of 5 kΩ to 900 kΩ (HIG91, HIG93 series), alternatively in the range of 200 kΩ to 5 MΩ (HIG92, HIG94). Special IMDs are also available for different measuring ranges of insulation resistance.
  • IMDs are equipped with digital processing of the measured signal, which offers the user numerical information about the measured insulation resistance.
  • IMDs are designed with independent power supply. That means that these insulation monitors can be powered from a different system than the one they measure. This has the significant effect that the IMDs are able to measure even de-energized system.
  • The power supply of the device is AC as standard, for a nominal voltage of 230 V to 110 V / 50 Hz. However, versions with a 24 V DC supply are also available.
  • All IMDs are equipped with a digital bus, which allows information to be transmitted to the master system. For signaling of the IMD status, panels from the MDS-D series can also be used (variant with RS485).
Monitored IT power supply system type according to IEC 61557-8 AC
Measuring range of insulation resistance RF 200 ÷ 5 000 kΩ
Adjustable range of critical insulation resistance Ran 200 ÷ 900 kΩ
Number of insulation resistance fault levels (Ran)
Rated voltage of monitored IT system (AC) Un 275 V
IMD power supply From measured IT system, From independent power source
Nominal supply voltage AC Us 90 ÷ 265 V
Nominal supply voltage DC Us 90 ÷ 370 V
Power consumption P 5 VA
Measuring voltage Um 12 V
Measuring current Im < 0.6 mA
Measuring input’s internal impedance Zi > 2 000 kΩ
Measuring accuracy ± 10 %
Electrical strength against internal circuits 3 750 V
Equipped with display Yes (OLED technology)
Supported module of distant signalisation (MDS) MDS10, None
Communication interface for user Ethernet bus, Webserver
Communication protocol MODBUS TCP
External control inputs Test start
Housing material Polyamid PA6, UL94 V-0
Degree of protection of front panel IP40
Degree of protection except the front panel IP20
Operating temperature ϑ - 10 ÷ 60 °C
Protection class according to IEC 61140 II
Recommended cross-section of connected conductors S 1 mm2
Installation On DIN rail 35 mm
Modular width 2, 3.5
Use for traction No
Operating position Any
Operation type Permanent
Quick contact
Ing. Aneta Sčebelová
 +420 494 942 314