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  • Insulation monitoring device for AC and DC IT systems
  • Application photovoltaic systems up to AC 793 V/DC 1100 V
  • Separately adjustable response values 200 Ω…100 kΩ
  • Automatic adaptation to the system leakage capacitance up to 2000 μF
  • Isometer disconnecting relay for the operation of several ISOMETER® in interconnected IT systems

The ISOMETER® of the isoPV series is designed to monitor the insulation resistance of unearthed main circuits (IT systems) AC, AC/DC 0…793 V resp. DC 0…1100 V. Solar systems containing inverters and isolating transformers are often designed as IT systems. iso-PV variants using the AMPPlus measurement method capable of adapting to slow voltage fluctuations meet the particular requirements of modern solar systems. Due to wide spatial distribution or EMC interference suppression methods often high leakage capacitances against earth occur in these systems. Considering this, the isoPV automatically adapts to the system conditions in order to optimise the measuring time. In particular, the requirements for permissible voltage ranges along with a low level of insulation can be met here.

Use the ISOMETER® isoPV in combination with the AGH-PV only. An external supply voltage allows deenergised systems to be monitored too.


  • Insulation monitoring for unearthed systems AC, AC / DC 0…793 V, DC 0…1100 V
  • Two separately adjustable response values 0.2 kΩ…100 kΩ
  • Various AMPPlus measurement methods selectable
  • Automatic adaptation to the system leakage capacitance
  • Info button to display device settings and the system leakage capacitance
  • Self monitoring with automatic alarm
  • Automatic self test, selectable
  • Connection for external kΩ indication
  • Test and reset button
  • External test/reset button can be connected
  • Two separate alarm relays with two potential-free changeover contacts
  • N/O or N/C operation, selectable
  • Backlit LC display
  • RS-485 interface
  • Presetting for PV systems via menu


  • AC, DC or AC/DC main circuits
  • Solar systems with directly connected inverters
  • Solar systems with high system leakage capacitances of up to 2000 µF
  • Solar systems with high but slow voltage fluctuations
  • Systems including switched-mode power supplies
  • Coupled IT systems

ISOMETER® isoPV with AGH-PV Variant(s)

TypeNominal system voltage UnSupply voltage USArt. No.
isoPV-327 with AGH-PV

consisting of:
3(N)AC 0…793 V / DC 0…1100 VAC 19.2…55 V / DC 19.2…72 VB91065132W

isoPV-335 with AGH-PV

consisting of:
3(N)AC 0…793 V / DC 0…1100 VAC 88…264 V / DC 77…286 VB91065133W

B 9106 5131W
B 9803 9020W

Optional Accessories for ISOMETER® isoPV with AGH-PV

External kΩ measuring instrument 20 mA

TypeArt. No.

Downloads for ISOMETER® isoPV with AGH-PV

Manuals isoPV mit AGH-PV 2.3 MB DE2019/05/13 10:31:4613.05.2019 10:31:46D00024
Manuals isoPV with AGH-PV 2.2 MB EN2019/05/13 10:31:5313.05.2019 10:31:53D00024
Manuals isoPV avec AGH-PV 1.1 MB FR2019/05/13 10:31:5513.05.2019 10:31:55D00024
Datasheets isoPV mit AGH-PV 627.6 KB DE2019/05/13 10:31:3513.05.2019 10:31:35D00024
Datasheets isoPV with AGH-PV 582.6 KB EN2019/07/16 06:18:0816.07.2019 06:18:08D00024
Datasheets isoPV con AGH-PV 721.4 KB ES2019/05/13 10:31:3713.05.2019 10:31:37D00024
Datasheets isoPV + AGH-PV 855.6 KB ZH2019/05/13 10:31:3313.05.2019 10:31:33D00024