Article number: 70 927/N24.1
  • HIG93T are a series of insulation monitor devices (IMDs) for insulated systems (IT systems) in rolling stock.
  • The IMDs are designed according to the EN 50155 standard and are prepared for measuring insulation resistance in trains, trams, and trolleybuses.
  • The IMDs are usually applied with a range of TL * T coupling devices, which allow monitoring of the usual operating voltages of 3 x 400 V or 3 x 500 V.
Monitored IT power supply system type according to IEC 61557-8 AC
Measuring range of insulation resistance RF 5 ÷ 900 kΩ
Adjustable range of critical insulation resistance Ran 5 ÷ 300 kΩ
Number of insulation resistance fault levels (Ran)
Rated voltage of monitored IT system (AC) Un 275 V
IMD power supply From independent power source
Nominal supply voltage AC Us 10 ÷ 26 V
Nominal supply voltage DC Us 11 ÷ 38 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) MDS-D, MDS-DELTA
Communication interface for user RS485 bus
Communication protocol ISOLGUARD, PROFIBUS
Housing material Polyamid PA6, UL94 V-0
External control inputs Test start
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
Use for traction Yes
Operating position Any
Operation type Permanent
Quick contact
Ing. Aneta Sčebelová
 +420 494 942 314