Watertight rotary control devices in antistatic thermosetting (GRP) suitable for applications in areas at risk of explosive atmospheres as defined in ATEX Directive 2014/34/EU. The cover is attached to the back box by means of stainless steel screws, while the sealing is guaranteed by a gasket in non-ageing elastomer. Supplied with internal earth terminal. The isolator is an AC23A-AC3 class switch at rated current with the capacity of withstanding a short circuit 10kA; the mechanical duration is over one million operations.