Insulation monitoring device for unearthed AC control circuits (IT systems)

The ISOMETER® IR420-D4 monitors the insulation resistance of unearthed AC control circuits (IT systems) 0…300 V. If the systems to be monitored include DC components, such as switched-mode power supplies or solenoid valves, the display and operating characteristics may be affected.
The display and response values apply to pure AC systems. An external supply voltage allows de-energised systems to be monitored too.

  • Insulation monitoring device for AC IT systems
  • Application control circuits
  • According to IEC 61557-8
  • Two separately configurable response values
  • Multi-functional LC display
Besleme Gerilimi Besleme Gerilimi Type Art No
AC DC Screw-type terminal Push-wire terminal
16…72 V, 42…460 Hz 9.6…94 V IR420-D4-1 B91016409 B71016409
70…300 V, 42…460 Hz 70…300 V IR420-D4-2 B91016405 B71016405


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