Login EN Search Solutions Products Horstmann Contact News Short-circuit and earth fault indicators Remote monitoring Voltage detectors Short-circuiting and earthing devices Substation accessories Product finder for short-circuit indicators Selection scheme for short-circuit and earth fault indicators Project planning for directional fault indicators (Sigma D and ComPass B series) 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… Read more 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… Read more 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… Read more Testimonials Previous 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 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 Next Contact Wishlist & Inquiry Product comparison Product finder Dipl.-Ing. H. Horstmann GmbH Humboldtstraße 2 42579 Heiligenhaus, Germany Phone +49 2056 976-0 Fax +49 2056 976-140 info@horstmanngmbh.com Privacy policy Impressum Contact person Contact We use cookies to ensure that you have the best experience on our site. Allow tracking cookies Tracking cookies are used to save and analyze website visitors and their behavior on the site. This gives us the opportunity to improve the user experience on our website. Visit website with this selection