Back in 1954 an electrical engineer from Balteau (later absorbed by ALSTOM then AREVA), named René Soumoy, created a company named "Constructions Electriques RS".
First RS instrument transformers were designed at that time, with EDF and ALSTOM as main customers.
Originally based in Gentilly (near Paris, France), then in Sainte Ménéhould (Eastern part of France), this familly business grew with every year better performing instrument transformers reaching market. Vaccum casting techniques for resin insulating envelopes were developped in these times.
In 1973 the company is tranferred to Cepoy near Montargis (center part of France) to gather the activities of encapsulated instrument transformers and cast resin instrument transformers.
1995 sees the begining of exports for the RS ISOLSEC products line, which nowadays represents the main final destination of our measure and protection instrument transformers.
In 2005 the instrument transformer business of ALSTOM - AREVA designed for the equipment of Hi Voltage substations joins RS ISOLSEC. In that same year, the instrument transformer business of Schlumberger - Actaris - also joins the RS ISOLSEC group.
