Insulated plug-in module

Claim 1

A cabinet having (1) wall means defining a plurality of recesses designed for sliding insulated plug-in modules therein; and (2) a plurality of insulated plug-in modules, each of said plug-in modules being inserted into one of said recesses, respectively, and comprising in combination: (a) a case of an insulating material; (b) a front wall carrying front connection means, said front connection means being determined for receiving input signals which are specific to a certain application; (c) a back wall carrying rear coupling means; (d) a first and second plurality of structural elements and components for power and signal transmission and for signal processing, said first and second plurality of elements and components being connected to form respective first and second internal electrical circuits, whereby said first circuits are specific to said application, and whereby said second circuits are identical for various applications and identical for said plurality of plug-in modules; (e) a first printed circuit board connected between said front wall and said back wall, said board supporting said first plurality of structural elements and said first plurality of components forming said first circuits which are specific to said application; (f) a second printed circuit board mounted on said back wall and arranged parallel to said first printed board, said second board supporting said second plurality of structural elements and said second plurality of components forming said second circuits which are identical for various applications, said second board being inserted along with said first board and said back wall in said case such that said front wall forms the front wall of said case, said case and said front wall thereby forming the housing of said plug-in module.