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


  • Increase of the ISOMETER® nominal voltage range
  • Used with ISOMETER® of the iso685 series
  • For AC up to 1650 V

The coupling device AGH204S-4 is designed to extend the nominal voltage range of the ISOMETER® iso685 series to AC, 3(N)AC 0…1650/0…1300 V, 50…400 Hz. The coupling device is connected to the system to be monitored according to the wiring diagram and connected to the terminal AK of the ISOMETER® by means of terminal AK… .



Downloads for AGH204S-4

Handbücher AGH204S-4 1.5 MB DE12.03.2021 07:42:55D00094
Handbücher AGH204S-4 1.5 MB EN12.03.2021 07:42:55D00094
Datenblätter AGH204S-4 194.2 KB ZH13.05.2019 10:31:32D00094
Datenblätter AGH204S-4 375.2 KB DE10.09.2019 10:16:12D00094
Datenblätter AGH204S-4 340.6 KB EN10.09.2019 10:16:27D00094
Datenblätter AGH204S-4 338.5 KB ES10.09.2019 10:16:42D00094

Optional accessories for AGH204S-4

AGH204S-4 Variants

TypeNominal system voltage UnArt. No.
AGH204S-4AC 0…1650 V/0…1300 VB914013