- 1948: formation of ELPO GmbH in Altdorf, near Nuremberg, by Jakob Ellenberger and Harald A. Poensgen
- 1953: launch of the E-T-A Circuit Breakers for Equipment (CBEs) protection programme
- 1955 and 1957: Overseas expansion – establishment of subsidiary companies in Chicago/USA and Montreal/Canada
- 1961: opening of manufacturing plant in Hohenfels/Germany
- 1969: formation of the electronic division leads to innovations in protection and control technology
- 1976: formation of E-T-A Circuit Breakers Ltd. in the UK
- 1977: commencement of production of E-T-A CBEs in Tunisia
- 1978: forrmation of E-T-A Elektrotechnische Apparate GmbH
- 1980s and early 1990s: formation of subsidiaries in Austria, Spain, Belgium, Italy and France
- 1991: expansion of manufacturing capability with inauguration of new plant in Altdorf.
- 1993: ISO 9001 Certification.
- 1994: formation of subsidiary in Japan.
- 1997: manufacturing plant opened in Pasuruan/Indonesia to serve the rapidly growing South East Asia market formation of E-T-A Asia Pacific in Singapore
- 1998: E-T-A celebrates its 50th anniversary - and its continuing growth...
- 2002: E-T-A certified to the new DIN EN ISO 9001:2000 and DIN EN 9100
- 2005: formation of E-T-A Australia, China and Thailand
- 2006: E-T-A Quality Management System certified to ISO/TS 16949:2002 opening of the new logistics center in Altdorf
- 2007: formation of E-T-A Russia
- 2008: manufacturing plant opened in Surabaya/Indonesia
