VEI began to design and construct electrical plants in the 1960's, becoming ever more specialized in the electrical distribution field and in particular the Medium Voltage sector. At the beginning of the 70's they began to design and manufacture MV switchgear with metallic enclosure. By the beginning of the 80's VEI was developing switch-disconnectors and it was during these years that the ISARC series was developed and was to make VEI famous worldwide with more than 600.000 apparatus being installed. ISARC today is still being produced after successive modernisation