Frames. Heavy-duty connectors, HDC - application, ConCept. The frames of the modular ConCept system allow for the accommodation of ConCept modules. These frames are designed for sizes 3, 4, 6, and 8, making them compatible with the corresponding enclosures of these sizes. The capacity of the frames ranges from 2 modules to 7 modules, enabling users to customize their connector as needed. The basic version offers users robust, one-piece module frames, available in either polycarbonate or zinc die-cast. Only frames of the same size and material are compatible with each other.