Apparatus for the control and/or distribution of electric power comprising a protective anti-dust device

An apparatus for the control and/or distribution of electric power comprising:

• a generally box-shaped supporting structure delimiting an inner space, the supporting structure comprising confinement walls of the inner space in at least one of which an access opening to the inner space is defined;
• a switching member suitable for establishing/interrupting electrical connections, said switching member being housed in the inner space;
• at least one electrical connection terminal;
• a protective device against the intrusion of dust and similar stably coupled to the supporting structure, comprising a tearable membrane occluding the access opening and intended for being torn and/or traversed by a fitting or connecting device which can be coupled to the apparatus by engagement with said opening;
• characterised in that
• the electrical connection terminal comprises a screw clamp, the apparatus comprising a diaphragm housed in the inner space and such as to divide the inner space into a first and at least one further chamber, the tearable membrane being fixed to the diaphragm, wherein the first chamber and the further chamber house respectively said switching member and said screw clamp.