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Innovative technologies for safe handling of electrical power to achieve high availability

We offer you first-class quality and safety combined with global service and every support in resolving your monitoring problems.

  • Electrical safety for unearthed power supplies (IT systems)
  • Insulation monitoring equipment, insulation fault location systems
  • Power supplies for medical applications
  • Measuring and monitoring relays
  • Electrical safety for earthed power supplies (TN systems)
  • Using renewable energies efficiently: wind power, photovoltaics
  • Test systems for electrical equipment and medical technology
ISOMETER® isoLR275

ISOMETER® isoLR275 with AGH-LR

  • Insulation monitoring device for AC and DC IT systems
  • Application main circuits with low-resistance insulation level
  • Separately adjustable response values 200 Ω…100 kΩ
  • Isometer disconnecting relay for the operation of several ISOMETER® in interconnected IT systems
  • History memory with real-time clock for storing alarm messages with date and time

The isoLR275 ISOMETER® in conjunction with the AGH-LR coupling device monitors the insulation resistance of IT systems. It is suitable for universal use in 3(N) AC, AC/DC and DC systems. AC systems may include extensive DC-supplied loads, such as converters or thyristor-controlled DC drives. The adaptation to the existing system leakage capacitances takes place automatically.

Only use the AGH-LR coupling device supplied with the device for adaptation of the nominal voltage range.

isoLR275 can share the BMS bus with other bus devices

Features

isoLR275

  • ISOMETER® for IT AC systems with galvanically connected rectifiers or converters and for IT DC systems (IT = unearthed systems)
  • Particularly suited for monitoring electrical installations with a low level of resistance
  • isoLR275 is always operated in conjunction with AGH-LR
  • Automatic adaptation to the existing system leakage capacitance
  • AMPPlus measurement method (European Patent: EP 0 654 673 B1)
  • Choice of measurement methods to meet different requirements
  • Two separately adjustable response ranges of 0.2 kΩ…100 kΩ each (Alarm 1, Alarm 2)
  • Two-line LC display
  • Automatic device self test
  • 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 galvanically isolated)
  • Internal disconnection of the ISOMETER® from the IT system to be monitored (via control signal; terminals F1/F2), e.g. if several ISOMETER®s are interconnected
  • Current output 0(4…20 mA (electrically isolated) in relation to the insulation value measured in the system

AGH-LR

  • Coupling device required for ISOMETER® isoLR275
  • Nominal voltage range AC 0…793 V and DC 0…1100 V
  • DIN rail mounting

Applications

  • AC, DC or AC/DC main circuits
  • IT systems with directly connected inverters
  • IT systems with high system leakage capacitances of up to 500 μF
  • IT systems with high but slow voltage fluctuations
  • Systems including switched-mode power supplies
  • Coupled IT systems

Downloads for ISOMETER® isoLR275 with AGH-LR

CategoryNameSizeLanguageTimestampD-/B-Number
Datasheets isoLR275 391.2 KB DE13.05.2019 10:31:35D00127
Datasheets isoLR275 342.2 KB EN13.05.2019 10:31:37D00127
Datasheets isoLR275 336.8 KB ES13.05.2019 10:31:37D00127
Datasheets isoLR275 645.8 KB ZH13.05.2019 10:31:33D00127
Manuals isoLR275 2.2 MB DE20.04.2021 08:07:51D00127
Manuals isoLR275 2.1 MB EN20.04.2021 08:09:31D00127
Quickstarts isoLR275 999.5 KB DE12.03.2021 07:05:26D00127
Quickstarts isoLR275 999.5 KB EN12.03.2021 07:05:26D00127

ISOMETER® isoLR275 with AGH-LR Variants

TypeNominal system voltage UnSupply voltage USArt. No.
isoLR275-327 + AGH-LR-3

consisting of:
isoLR275-327
AGH-LR
3(N) AC 0…793 V / DC 0…1100 VAC 19,2…55 V / DC 19,2…72 VB91065702W


B91065700W
B98039022W
isoLR275-335 + AGH-LR

consisting of:
isoLR275-335
AGH-LR-3
3(N)AC 0…793 V / DC 0…1100 VAC 88…264 V / DC 77…286 VB91065703W


B91065701W
B98039022W