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.


  • Insulation monitoring device for AC and DC ungrounded systems
  • Used on control circuits and main circuits
  • Two response values adjustable via rotary switch or mobile app
  • Measured value display via LEDs
  • Modbus RTU and NFC interfaces

The new ISOMETER® iso415R is a simple and intelligent ground-fault monitor for electrical safety in control circuits and other applications. It is for ungrounded systems for compliance with IEC 60364-4, and meets IEC 61557-8 requirements. It combines easy operation, multiple interfaces, flexible application options and a compact design. It is the first device of Bender's new SmartDetect series and offers maximum safety in ungrounded AC, AC/DC, and DC systems.

Fast, simple operation was a central goal in the development of the new iso415R. That is why the parameters of the ISOMETER® can be set either with two rotary potentiometers, with the Bender Connect app, or with Modbus RTU communications. With the app, the iso415R can be set up before installation. In addition, a setting made once can be transferred to any number of devices. All technical information including the manual can be conveniently accessed at any time via the QR code. The measured value is displayed by LEDs. The device, which is only 18 mm (0.7”) wide, is installed by simply pushing it into place on a DIN rail.

Easy configuration via app

With the NFC function and the Bender Connect App you can easily configure the iso415R via a smartphone.


  • Monitoring of the insulation resistance for unearthed 3(N)AC, AC and DC systems with galvanically connected rectifiers
  • Automatic adaptation to the system leakage capacitance up to 25 μF
  • Response time ≤ 6 s at Ce = 1μF and Rf = Ran/2
  • Automatic device self test with connection monitoring
  • Two separately adjustable response value ranges from 5 kΩ…1000 kΩ
  • Alarms are output via LEDs (AL1, AL2) and an alarm relay
  • Selectable N/C or N/O relay operation 1
  • Selectable start-up delay, response delay and delay on release 1
  • Fault memory 1
  • RS-485 interface with Modbus RTU protocol
  • NFC interface

1 Only adjustable via Modbus RTU or Bender App.


  • Large-scale plants with many control circuits
  • Applications requiring a communications interface
  • Main circuits up to 400 V in small ungrounded systems (AC and DC) without VFDs

ISOMETER® iso415R Variant(s)

TypeSupply voltage UsNominal system voltage UnArt. No.
iso415R-24DC 24 VAC 0…415 V / DC 0…400 VB71602000*
iso415R-2AC/DC 100…240 V(3)AC 100…240 V, 3NAC 100…415 V / DC 100…240 VB71603000

* An additional power supply is required for the device version iso415R-24

Optional Accessories for ISOMETER® iso415R

Power supply

TypeRated input voltage UINRated voltageArt. No.
STEP-PS/1 AC/24 DC/0.5AC 85…264 V, 45…65 Hz; DC 95…250 VDC 24 VB94053110

For the device version iso415R-24 (B71602000), an additional power supply is required

Downloads for ISOMETER® iso415R

CE Declarations of conformity iso410_415_420 142.2 KB 2022/08/12 06:17:2512.08.2022 06:17:25
Quickstarts iso415R-x 2.3 MB DE2022/07/21 12:32:5721.07.2022 12:32:57D00401
Quickstarts iso415R-x 2.3 MB EN2022/07/21 12:32:5721.07.2022 12:32:57D00401
Datasheets iso415R-x 465.1 KB DE2022/09/13 13:36:4413.09.2022 13:36:44D00401
Datasheets iso415R-x 458.4 KB EN2022/09/13 13:36:5613.09.2022 13:36:56D00401
Manuals iso415R-x 2.4 MB DE2022/07/21 12:32:3721.07.2022 12:32:37D00401
Manuals iso415R-x 2.4 MB EN2022/07/21 12:32:4621.07.2022 12:32:46D00401
Flyer iso415R 616.6 KB EN2021/07/07 11:29:4107.07.2021 11:29:41D00401
Flyer iso415R 933.0 KB DE2021/06/29 13:49:5429.06.2021 13:49:54D00401
Flyer iso415R 932.9 KB EN2021/06/30 10:14:5330.06.2021 10:14:53D00401
Flyer iso415R 555.9 KB ES2021/07/09 06:14:3609.07.2021 06:14:36D00401
Technical information Software information 33.8 KB EN2022/09/13 10:44:5513.09.2022 10:44:55