Contact insert. Heavy-duty connectors, HDC insert, ConCept module. Universal and flexible - the solution for many applications. ConCept is a modular system consisting of modules and frames. Together, they form a complete insert that can be easily integrated into an HDC housing. The patented modular system allows for the assembly of individual connector variations. Different modules for power, signal, and data transmission are complemented by modules for pneumatics and SC and LC cables. Advantages arise from the robust, one-piece modular frame construction, available in polycarbonate or zinc die-cast, and the integrated module release aid across a variety of modules.