Patent ID: 8471162

Claim:
A single-pole or multi-pole switching device for low voltage systems comprising a case containing at least one pair of contacts that can be reciprocally coupled/decoupled; at least one containment structure to contain at least one accessory device of said switching device, comprising means for interfacing with said accessory device; at least one accessory device comprising a body that can be inserted in said containment structure and provided with coupling means to couple it to said containment structure; said accessory device comprising operating means to interact with said switching device via said interface means of said at least one containment structure, said accessory device being provided with disengagement means operatively connected with said coupling means, said disengagement means, once activated, freeing said coupling means to permit the extraction of said accessory device from said containment structure; wherein said coupling means of said accessory device comprise a first lever arm pivoting on a flexible fulcrum portion emerging from a surface of said body of said accessory, said first lever arm comprising a free end which couples to a corresponding coupling surface of said containment structure when said accessory device is inserted in the structure; and wherein said disengagement means comprise a second lever arm provided with an actuation portion, said second lever arm being operatively connected to said first lever arm in order to free, when activated, said free coupling end from said coupling surface of said containment structure; wherein said first lever arm and said second lever arm develop on opposite sides with respect to said fulcrum portion and in such a way that said actuation portion of said second lever arm remains accessible once said accessory device is inserted in said containment structure; wherein said body comprises a first and a second flat surface substantially parallel to each other and at least one pair of reciprocally opposed lateral surfaces which develop in a direction substantially square to said flat surfaces, said coupling means comprising a pair of first lever arms each of which pivots on a fulcrum portion emerging from one of said opposed lateral surfaces, said disengagement means comprising a pair of second lever arms each of which are made in one single piece with a corresponding first lever arm, each of said second lever arms developing on a side opposite that of the corresponding first lever arm so that said actuation portion remains accessible once said accessory is inserted in said containment structure; wherein said body of said accessory comprises a first surface substantially square to said flat surfaces and to said opposed lateral surfaces, said operating means emerging from said first surface, said body comprising a second surface substantially opposite said first surface, said second surface comprising one or more connection terminals for the interface of said accessory device with other parts of said switching device.