About us





Since more than 50 years we manufacture top quality surge arresters in our factory in Hermsdorf/Germany.
At the same time our company looks back to a history of more than 100 years.
Today TRIDELTA Surge Arresters stand for worldwide best quality, highest reliability and free of maintenance over their whole service life. Our portfolio of metaloxide surge arresters for system voltages from 1 kV up to 800 kV is completed by customized arrester solutions for special applications.
Our surge arresters are in reliable service in more than 120 countries worldwide and prove successfully their duty even under the most severe climatic conditions.
Since 2015 Tridelta is part of Meiden Corporation with Headquarters in Japan.
History

1889
Foundation

1897
High Voltage Insulator „DELTA-Glocke”

1901
Start manufacturing of porcelain insulators
1920
Start manufacturing of 110 kV insulators

1960
Start manufacturing of surge arresters

1968
development of first 400 kV surge arrester

1989
Manufacturing of metaloxide varistor surge arresters

1997
Introduction of surge arresters with silicone housing

2004
development of first 800 kV surge arrester

2007
Introduction cage design surge arresters

2015
Tridelta becomes part of international Meidensha Group
Pictures are provided by "Verein für Regional- und Technikgeschichte e.V. Hermsdorf"
Quality management and environmental protection
„Customer satisfaction and continuous process improvement - the way to secure the future.”
Tridelta Meidensha GmbH maintains a process-oriented quality and environmental management system according to DIN EN ISO 9001 and DIN EN ISO 14001. The system, the processes, technologies, procedures and activities are described in the management documentation. These documents define the specifications for all business processes, in particular the quality and environmental planning as well as the development and production of high-quality and environmentally friendly products and their testing.
The manufacturing of our products is carried out according to the requirement of IEC 60099-4 standard. All products must be individually examined with calibrated measuring equipment before delivery. A corresponding certificate of conformity shall be drawn up for each article.
Certificates
Tridelta Test Laboratory
Tridelta has a modern and highly efficient high-voltage laboratory, in which any surge arrester related tests according IEC 60099-4 like type tests or customer acceptance tests can be carried out.
Testing Facilities
- impulse generator up to 1.2 MV
- 600 kV power frequency voltage transformer
- varistor test facility IP 225/100
- 100 kA high current impulse generator
- long wave generator for line discharge classes 1 - 5
- 5000 hour weather ageing test facility
- climatic chamber for -40°C to +100°C
- mechanical bending and tensile test facility for up to 30 000 N
Our development department is certified according to ISO 9001.