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

The bell rings

We would like to thank ERTECH Elektronik AG, our representative in Switzerland and Liechtenstein, for this beautiful and festive cowbell as a gift for…

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We use the power of the sun

We have installed a 100 kWp photovoltaic system at our factory in Körperich. 264 solar modules generate around 99 kWh on an area of 500 m². This is…

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75 years of Horstmann – a great reason to celebrate

Dipl.-Ing. H. Horstmann GmbH can look back on three quarters of a century of company history this year – a good reason to celebrate the anniversary…

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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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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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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

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