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


  • Automatic insulation fault location
  • Application control circuits
  • 6 measuring channels
  • Integrated measuring current transformers
  • Universal system concept

The insulation fault locator EDS151 in conjunction with the ISOMETER® isoMED427P, are designed for insulation fault location in unearthed power supplies (IT systems). The locating current pulse generated by the ISOMETER® isoMED427P are detected using the integrated measuring current transformers and evaluated by the insulation fault locators. The integration of six measuring current transformers in an EDS151 permits all current-carrying conductors of an outgoing line to be routed through. The response time for an alarm message inclusively indication on the respective display device is max. 8 s (e.g. MK2430).

A total of 88 EDS151 devices can be connected via an RS-485 interface (BMS protocol). Hence, up to 528 circuits can be monitored. Activities on the BMS bus are indicated by an alarm LED.


  • Insulation fault location in AC, AC/DC and DC IT systems
  • 6 measuring channels with measuring current transformer per EDS151
  • Up to 528 measuring channels can be combined by the BMS bus in the IT system being monitored: 88 x 6 measuring channels
  • Response sensitivity EDS151: 0.5 mA
  • A response time of up to 8 s in the AC system acc. to IEC 61557-9
  • RS-485 interface with BMS protocol
  • BMS address range 3…90
  • Cyclical self test


  • Insulation fault location in AC, AC/DC and DC IT systems
  • DC main circuits in industrial plants, power stations and ships
  • IT systems for medical locations and control circuits

Downloads for ISOSCAN® EDS151

Manuals EDS151 572.5 KB DE13.05.2019 10:31:30D00107
Manuals EDS151 572.5 KB EN13.05.2019 10:31:30D00107
Datasheets EDS150/151 280.0 KB DE13.05.2019 10:31:34D00106
Datasheets EDS150/151 236.3 KB EN13.05.2019 10:31:35D00106
Datasheets EDS150/151 282.1 KB ES13.05.2019 10:31:37D00106
Datasheets EDS150/151 461.0 KB ZH13.05.2019 10:31:32D00106
Application brochures Selectief aardfout zoeksysteem EDS 933.7 KB NL13.05.2019 10:31:28
Flyer Industrial EDS Flyer 1.1 MB EN28.04.2021 13:38:13
Flyer Healthcare EDS Flyer 1.7 MB EN29.04.2021 15:23:15
Product Brochures Mining Brochure 11.7 MB ES22.05.2020 14:37:31

Optional accessories for ISOSCAN® EDS151

TypeSupply voltageOutput voltageArt. No.Note
AN410AC 90…264 V, 47…63Hz*
DC 120…370 V*
DC 24 V, 420 mAB924209Supplies up to six EDS151
AN450AC 230 V, 50…60 HzAC 20 V, 500 mAB924201Supplies up to six EDS151
AN450-133AC 127 V, 50…60 HzAC 20 V, 500 mAB924203Supplies up to six EDS151

* Absolute values of the voltage range

ISOSCAN® EDS151 Variants

TypeSupply voltage*Art. No.
EDS151AC 17…24 V, 50…60Hz/DC 14…28 VB91080101

* Absolute values of the voltage range