Receptacle device of a terminal block for alternatively receiving a first accessory and a second accessory

An accessory cooperation system, comprising:

• a first accessory having a plurality of first sized cooperating elements;
• a second accessory having a plurality of second sized cooperating elements;
• and
• a receptacle device alternatively receiving the first accessory or the second accessory in a mounted position, the receptacle device has a first cooperating assembly configured to receive the first accessory and a second cooperating assembly configured to receive the second accessory, the first cooperating assembly has a pair of protrusions of a first type that are symmetrical on an inward facing side with regard to a first central plane and that extend toward each other transversally to the first central plane, and asymmetrical on an outward facing side, the second cooperating assembly has a pair of protrusions of a second type that are symmetrical on an outward facing side with regard to a second central plane and that extend opposite to each other transversally to the second central plane and asymmetrical on an inward facing side, the first central plane being parallel to and displaced transversally from the second central plane.