Scientific, electric and electronic apparatus and instruments for conveying, directing, distributing, transforming, accumulating, regulating, filtering, measuring, signaling, monitoring or controlling electric current, including electric or electronic components for such apparatus and instruments, rectifiers, semiconductors, electric relays, capacitors, inductive resistors, circuit breakers, switches, contactors, automatic systems, control panels, static converters, programmers, computers, batteries, storage batteries, apparatus for supply, filtration, transformation, maintenance and storage of electrical power