Dipl. Ing. H. Horstmann GmbH is a medium-sized company based in Heiligenhaus near Düsseldorf (Germany). The company was founded in 1946 by Heinrich Horstmann, and since that time it has been a successful family-owned company. Due to its long experience and continuous investment in research and product development Dipl.-Ing. H. Horstmann GmbH is today recognized as a leading manufacturer in medium voltage technology for:

  • Short-circuit and earth fault indicators
  • Voltage testers and voltage detecting systems
  • Earthing devices and accessories.

Further information


New substation

Good news, today the new substation (630 kVA, 10 kV) was successfully commissioned on schedule.

This substation will supply our new production and…

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Westnetz GmbH relies on Smart Navigator 2.0

Toppled trees, lightning and other natural causes often lead to disruptions to power supply via overhead lines. Troubleshooting is usually…

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Tack Maxeta!

On behalf of Dirk Horstmann and our team, we would like to thank Maxeta AS very much for the very nice gift and the congratulations to our 75th

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SAE IT-systems

"In order to master the exciting tasks of the coming years, we believe that only holistic solutions will lead to the goal. For many years, Horstmann has been one of our strong partners, making a significant contribution with its know-how to our solution concepts for smartification of the networks."

Mr. Callegari, Managing Director Sales

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Westnetz GmbH

"We like to use the high-quality products of Horstmann GmbH in our assets, such as short-circuit and earth fault indicators ComPass or capacitive voltage indicators of the Wega series.

In addition to the product quality, we particularly appreciate the company's customer focus and innovative ability."

Bastian Wölke, Technical Product Manager Medium Voltage Switchgear

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Elektrotechnik Eimers

"Horstmann GmbH has been a leading supply partner of Elektrotechnik Eimers GmbH for products in the field of short-circuit indicators and voltage testers for more than 20 years. Their products always meet the highest quality standards and the support is excellent."

Axel Eimers, Managing Director

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“The very reliable short-circuit indicators from Horstmann have been used in the Remscheid electric power grid for a long time. Together, we are now taking the next step in digitization in the distribution grid. Horstmann has been highly flexible in responding to our wishes and ideas and has developed a new product with us and for us within a very short time.”


Frank Aschenbroich, Manager Electric Power Grid

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Stadtwerke Lünen

"During the retrofitting and integration of the ComPass Bs 2.0 in remotely switchable substations, Horstmann was always available to us as a competent partner."

 Rainer Steinkuhl, Stadtwerke Lünen GmbH


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Elektrotechnische Werke Fritz Driescher & Söhne GmbH

"Dipl.-Ing. H. Horstmann GmbH is one of the most innovative partner companies for Driescher with regard to the increasing requirements for more digitalization in the energy supply business. In addition, Horstmann is aways willing to listen to our concerns and wishes."

Christoph Driescher, CEO


Trade fair dates

Many trade fairs will take place in 2022.


Hannover Messe

30.05. – 02.06.2022

You will find us in hall 13 stand E58

Innotrans Berlin

20.09. - 23.09.2022


Belektro Berlin

08.11. - 10.11.2022


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