modular interchangeable and enbloc series for fixed electrical installations with electrical and electronic equipment, namely, electromechanical, electronic and infrared switches and controls, push buttons, dimmers and relays; fixed socket outlets for electrical supply, television, telephone and electronic data processing signals reception; remote sensors for monitoring the operational state of commerical and household appliances and lighting equipment; emergency warning lights; electric signalling bells, buzzers and chimes; electronic, visual and acoustic signalling apparatus for controlling access to premises; electromechanical and electronic equipment designed for protection against electric overload, electric shock and short circuits, namely, fuse holders, transient voltage suppressors, circuit breakers, residual current operated magneto-thermic circuit breakers, and magneto-thermic circuit breakers; electronic burglar alarm and anti-intrusion alarm systems, namely, alarms, central control units, sirens, power supplies, detectors, transformers, receivers, transmitters, and parts therefor; fire alarms, smoke alarms, and chemical detection alarms; sound amplifiers and transmitters and parts therefor; electric plugs, surface and portable socket outlets for electrical supply and for signal reception; plug-in-timers; one-way and multi-way electrical adaptors; table-type electric socket outlets; electric cable reels; flexible cord operated switches; push button operated switches; flush or surface electrical mounting and junction boxes with open lids or fixed covers equipped or supplied with necessary parts to accept switch disconnectors, circuit breakers, magneto-thermic circuit breakers for circuit identification and protection; dustproof and waterproof electrical boxes for flush, surface, panel, architrave, or table type mounting for household purposes, and parts therefor