Company history

DEHN historyFascinated by the force of a lightning strike, Hans Dehn decided to specialise in lightning protection. Since the foundation of the company on January 21, 1910 in Nuremberg, Germany, he was engaged both in the installation of electrical systems and lightning protection systems.

In the early 1920s he started manufacturing lightning protection and earthing components. Over the following decades, electrical and electronic devices found their way into all aspects of life and work. It became more and more apparent that conventional lightning protection alone would not be sufficient to provide protection against fire. The importance of internal lightning protection, also known as surge protection, became evident. As a result of intensive development work, we launched the world’s first indoor surge arrester for use in low-voltage installations at the beginning of the 1950s.
Shortly afterwards, we extended our portfolio by safety equipment for protecting of persons working on electrical systems and persons installing and maintaining these systems.
About 1,600 employees of the DEHN group proudly look back on more than 100 years of continuous development, tradition and experience.


More detailed information on our company‘s history

DEHN is an innovative, globally active family-owned electrotechnical company with more than 100 years of experience and tradition.

1910: Registration of an electrical installation business in Nuremberg. Apart from local network construction, construction of overhead lines and installation work on buildings, mounting of lightning protection systems on buildings is an integral part of the business activities.
1918: Very quickly, Hans Dehn finds himself involved in the complex problems surrounding lightning protection. In 1918, he is granted his first patent on this subject.
1921: A subsidiary is set up in Neumarkt, about 45 km from Nuremberg.
1923: Hans Dehn starts to produce lightning protection and earthing components.
1933: The company grows. Hans Dehn transfers a part of the responsibility to his sons Walter and Willy. Both become co-partners and the family-owned company is named DEHN & SÖHNE. In 1941, the youngest son Richard becomes a co-partner.
1939-1945: The Second World War inevitably affects business development. The premises in Nuremberg and Neumarkt are considerably damaged during the war. Highly motivated, the family starts reconstruction.
1945: The starting point for post-war activities in Neumarkt is a warehouse built during the last months of the war in the area where the headquarters are located today.
1948: The decision to build a hot dip galvanising plant paves the way for developing the subsidiary in Neumarkt into a production site.
1952: DEHN + SÖHNE presents lightning protection and earthing equipment at the Hanover Fair for the first time.
1952: The increasing market demand requires a further expansion of the production facilities in Neumarkt.
1952: Besides lightning protection and earthing, the company starts to develop earthing and short-circuiting devices, which are an integral part of our safety equipment portfolio today. The patented ball pin decisively influences the state of the art.
1953: Austria becomes the first exporting country.
1954: DEHN is the world's first manufacturer to launch a surge arrester for use in low-voltage installations, the legendary J250.
1956: The KS connector that reliably connects circular conductors to flat profiles is developed.
1958: The separable earth rod, a pioneering innovation, considerably extends the range of earthing components and is in great demand. DEHN + SÖHNE becomes well-known in the field of earthing technology.
1960: The family-owned company celebrates its 50th anniversary. On this occasion, a new administration building is constructed in Nuremberg.
1970 – 1980: The company’s surge protection portfolio is continuously amended and extended. New protective devices such as VA 280 and BLITZDUCTOR® are developed.
1977: The safety equipment portfolio is considerably extended: Voltage detectors of type PHE and PHG, which are no longer purchased from other manufacturers, but developed in-house, are introduced to the market.
1984: The first lightning current carrying arrester, DEHNventil®, enters the market and becomes a synonym worldwide for a new generation of arresters. It allows the company to strengthen its leading position in the sector of surge protection.
1986: The success story of surge protection starts with the introduction of the world’s first arrester with a modular width of 17.5 mm, VM 280.
1988: Foundation of DESITEK A/S in Denmark - the first subsidiary outside Germany.
1991-1998: The company prepares for the future by developing and implementing the master plan DEHN 2000. National and international success requires comprehensive restructuring, reorganisation and reorientation in Neumarkt.
1993: The new energy-coordinated arresters of the Red/Line® family for low-voltage consumer‘s installations is launched. Surge protective devices such as DEHNport® and DEHNguard® start their success story.
1996: The new energy-coordinated arresters of the Yellow/Line family for the protection of data and automation systems are presented. BLITZDUCTOR® CT stands as milestone in the development in the field of lightning and surge protection.
1999: For transparency reasons, activities in the field of installation of electrical systems are spun off into a separate subsidiary called DEHN INSTATEC GmbH based in Nuremberg, Neumarkt and Hermsdorf (Germany).
2002: The master plan is continued by moving into new production facilities for surge protective devices.
2003: Completion of and move into a new administration building in Neumarkt.
2003: The HVI® conductor stands as milestone in external lightning protection. The separation distance can be easily maintained by using the new high-voltage-resistant down conductor, even in case of challenging architectural design.
2004: 50 years of surge protection by DEHN.
2006: Safe and functional arresters with a unique design. The new Red/Line® and Yellow/Line product families are launched.
2007: A three-storey production facility is built to expand the production capacities in Neumarkt.
2008: The new DEHNrecord MCM XT condition monitoring system acts like an early warning system, generating a fault message already in the event of imminent arrester overload.
2009: DEHNguard® SCI, a surge protective device for use in PV systems, is introduced to the market. It combines effective surge protection with personal and fire protection.
2010: DEHN celebrates its 100th anniversary. The small electrical installation business became a globally active family-owned company.
2010: We fund an endowed professorship at the Ilmenau University of Technology  to promote fundamental research on modern methods, technologies and materials in the field of lightning and surge protection.
2011: Foundation of our subsidiary DEHN INDIA in Gurgaon (New Delhi).
2012: DEHNvenCI, a coordinated spark-gap-based lightning current and surge arrester with integrated backup fuse, is introduced to the market.
2012: In the field of safety equipment, DEHN presents a new arc-fault-tested protective suit. DEHNcare® consists of a safety helmet, protective gloves, trousers as well as jacket or coat.
2012: Spark gap technology and d.c. extinction circuit of the DEHNlimit PV 1000 V2 combined arrester protects PV systems.
2013: Active arc fault protection system DEHNarc protects persons against the effects of arc faults and prevents damage to installations, downtime as well as the resulting costs.
2013: Establishment of three new subsidiaries DEHN PROTECTION SOUTH AFRICA (Pty) Ltd. in Johannesburg, OOO DEHN RUS in Moscow and DEHN PROTECTION MÉXICO, S.A. de C.V. in Mexico City.
2013: The high-voltage-insulated HVI®power Conductor is an ideal solution that makes lightning protection even more efficient. It ensures an equivalent separation distance of 90 cm in air.
2013: DEHNconnect DCO SD2, an efficient surge protective device that increases the safety of, for example, automation systems.
2013: DEHNcombo YPV SCI type 1 and 2 combined arrester with SCI technology for PV systems.
2013: DEHNcube YPV SCI the first type 2 d.c. surge arrester for PV systems to be installed outside of enclosures up to IP65 and is thus ideally suited for protecting string inverters.
2014: Change of management: Thomas Dehn retired after more than 33 years as Managing Partner. Besides Dr. Philipp Dehn, who joined the DEHNgroup in 2011 as Managing Partner, and Dr. Peter Zahlmann, Helmut Pusch took over the managerial responsibility.
2014: DEHN opens new logistics and production site in Muehlhausen (near Neumarkt).
2014: The new BLITZDUCTOR® SP is a powerful surge arrester which increases safety of data and information technology as well as measuring and control systems.
2014: The DEHNcord type 2 surge arrester reliably protects for example outdoor LED lights from surges caused by lightning interference.
2014: The intelligent type 2 surge arrester DEHNguard® SE features an early warning system (Lifetime Indication) which informs the user of an arrester’s end of life at an early stage.
2014: The new DEHNbox TC 180 is ideal for use in modern telecommunication systems (ISDN, analogue telephones, xDSL). Surges are limited to an acceptable level for the connected terminal equipment without interfering with the data signal.
2014: Foundation of a new sales office in Turkey.
2014: The telescopic test joint box from DEHN is a product for easy and proper integration of a test joint in the building insulation, i.e. the thermal insulation composite systems (ETICS).
2014: 200 kA clamps for LPL I and II with a lightning current carrying capability of 200 kA (10/350 µs) withstand maximum loads.
2014: DEHN Test Centre: The newly designed test laboratory generates extremely high lightning currents with a peak value up to 400 kA in the standardised 10/350 μs test wave form.