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, these form a fully-fledged insert that can be easily integrated into an HDC housing. The patented modular system allows individual connector variations to be put together. Different modules for power, signal and data transmission are supplemented by modules for pneumatics and SC and LC cables. The robust, one-piece module frame design, optionally in polycabonate or die-cast zinc, and the integrated module release aid for a wide range of modules offer advantages in terms of handling.