Abstract: An electrical module connecting arrangement includes a male lug projection integral with a first module and arranged for insertion within an opening contained in a second module, which opening includes an entrance portion having cross-sectional dimensions less than those of the lug projection, and an enlarged chamber portion of greater dimensions, thereby to define a transition wall surface. The male lug projection is formed from a suitable non-resilient compressible synthetic plastic material, such as a polyamide, that is so operable that a first section of the projection is compressed within the opening entrance portion, and a second section subsequently expands, after a delay, within the enlarged chamber portion and engages the transition wall, thereby to lock the two modules together.

Abstract: An electrical module connecting arrangement includes a male lug projection integral with a first module and arranged for insertion within an opening contained in a second module, which opening includes an entrance portion having cross-sectional dimensions less than those of the lug projection, and an enlarged chamber portion of greater dimensions, thereby to define a transition wall surface. The male lug projection is formed from a suitable non-resilient compressible synthetic plastic material, such as a polyamide, that is so operable that a first section of the projection is compressed within the opening entrance portion, and a second section subsequently expands, after a delay, within the enlarged chamber portion and engages the transition wall, thereby to lock the two modules together.