ISOMETER® IR420-D4

  • Ground-fault monitoring device for AC IT systems
  • Application control circuits
  • According to IEC 61557-8
  • Two separately configurable response values
  • Multi-functional LC display

The ISOMETER® IR420-D4 monitors the insulation resistance of ungrounded 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-energized systems to be monitored too.

Questions? Contact us!

ISOMETER® IR420-D4
ISOMETER® IR420-D4
  • Ground-fault monitoring device for AC IT systems
  • Application control circuits
  • According to IEC 61557-8
  • Two separately configurable response values
  • Multi-functional LC display

The ISOMETER® IR420-D4 monitors the insulation resistance of ungrounded 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-energized systems to be monitored too.

Questions? Contact us!

Features

  • Insulation monitoring for IT control circuits AC 0…300 V
  • Two separately adjustable response values
  • Preset function (automatic assignment of basic parameters)
  • Connection monitoring system/earth
  • LEDs: Power On, Alarm 1, Alarm 2
  • Internal/external test/reset button
  • Two separate alarm relays (one changeover contact each)
  • N/O or N/C operation, selectable
  • Fault memory behaviour, selectable
  • Self monitoring with automatic alarm message
  • Multi-functional LC display
  • Adjustable response delay
  • Two-module enclosure (36 mm)
  • RoHS-compliant
  • Push-wire terminal (two terminals per connection)

Applications

  • AC control circuits in the industrial sector, mechanical engineering, power plants, elevators, automation systems etc.
  • AC control and auxiliary circuits in accordance with IEC 60204-1 / DIN EN 60204-1 Electrical equipment of machines
  • AC auxiliary circuits in accordance with DIN VDE 0100-725 (VDE 0100-725)
  • Smaller AC IT systems such as lighting systems, mobile generators

ISOMETER® IR420-D4 Variant(s)

TypeNominal system voltage* UnSupply voltage* USResponse value RanSystem leakage capacitance CeArt. No.**
IR420-D4-1AC 0…300 V, 42…460 HzDC 9,6…94 V /
AC 16…72 V, 42…460 Hz
1…200 kΩ< 20 µFB71016409
B91016409
IR420-D4-2AC 0…300 V, 42…460 HzDC 70…300 V /
AC 70…300 V, 42…46 Hz
1…200 kΩ< 20 µFB71016405
B91016405

* absolute values
**(B7… = push-wire terminal / B9… = screw-type terminal)

Optional Accessories for ISOMETER® IR420-D4

TypeArt. No.
Mounting clip for screw mounting (one piece per device)B98060008
Mounting frame XM420 B990994 

Downloads for ISOMETER® IR420-D4

NameCategorySizeLanguageTimestampD-/B-Number
UKCA - IR42x Declarations of Conformity 140.6 KB 2022/12/2020.12.2022
IR42x CE Declarations of Conformity 94.2 KB 2022/08/1212.08.2022
IR420-D4 Manuals 2.0 MB EN2024/08/0909.08.2024D00037
IR420-D4 Datasheets 511.8 KB EN2024/07/3030.07.2024D00037
Changed variants of relays from goldplated to silver-plated contacts Technical Information 166.3 KB EN2022/06/2727.06.2022