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ISOMETER® IRDH275BM-7 with AGH675S-7…

ISOMETER® IRDH275BM-7 with AGH675S-7…

  • Insulation monitoring device for AC and DC IT systems
  • Application for drives including medium voltage converters up to 15.5 kV
  • In combination with AGH675S-7 and AGH675S- MV15
  • History memory with real-time clock for storing alarm messages with date and time
  • Galvanically isolated RS-485 interface for data exchange

The device combination ISOMETER® IRDH275BM-7 and the coupling device AGH675S-7 or the coupling devices AGH675S-7MV15 is designed to monitor the insulation resistance of unearthed medium voltage systems (IT systems). It is suitable for universal use in 3AC, combined AC/DC and DC systems. AC systems may include extensive DC-supplied loads. The AMPPlus measurement method meets the particular requirements of modern power supplies which often include rectifiers, converters, thyristor-controlled DC drives and directly connected DC components. Taking the system leakage capacitances into account, the IRDH275BM-7 automatically adapts itself to the existing system conditions in order to optimise the measuring time.

  • Features
  • Applications
  • Accessories
  • Ordering information
  • Downloads
  • Insulation monitoring for drives including medium voltage converters up to 15.5 kV
  • Two separately adjustable response values 100 kΩ…10 MΩ
  • AMPPlus measurement method (European patent: EP 0 654 673 B1)
  • Automatic adaptation to the system leakage capacitance
  • Info button to display device settings and the system leakage capacitance
  • History memory with real-time clock to store alarm messages with date and time stamp
  • BMS interface (Bender Measuring Device Interface) for communication with other Bender devices (RS-485 electrically isolated)
  • Current output 0(4)…20mA (electrically isolated) analogously to the measured insulation value
  • Self monitoring with automatic alarm
  • Automatic self test, selectable
  • Connection for external kΩ indication
  • Test and reset button
  • Connection external test and reset button
  • Two separate alarm relays with two potential-free changeover contacts
  • N/O or N/C operation, selectable
  • Backlit two-line plain text display
  • Remote setting of specific parameters via Internet (option; COM460IP with at least Option C required)
  • AC, DC or AC/DC medium voltage systems
  • AC/DC medium voltage systems with directly connected DC components, such as rectifiers, converters, and thyristor-controlled DC drives


Optional accessories for ISOMETER® IRDH275BM-7 with AGH675S-7…

External kΩ measuring instruments (20 mA)
TypeSKMP *2Art. No.
9620-17212,8 MΩB986849

Variants of ISOMETER® IRDH275BM-7 with AGH675S-7…

TypeNominal voltageSupply voltageCable lengthArt. No.
IRDH275BM-7--AC 19.2…55 V / DC 19.2…72 V--B91065120
AGH675S-7-2000AC/DC 0…7.2 kV, 0…460 Hz--2000 mmB913061
AGH675S-7-500AC/DC 0…7.2 kV, 0…460 Hz--500 mmB913060
AGH675S-7MV15-500AC/DC 0…15.5 kV, 0…460 Hz--500 mmB913058

Downloads for ISOMETER® IRDH275BM-7 with AGH675S-7…



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