Next generation cranes need higher power supplies. Energy chains – the protective chains that transport power and control cables in linear motion – must meet these requirements for longer travels, higher accelerations and operational uncertainties, as well as high reliability. The new Igus heavy-duty roller energy chain P4HD is made of highly abrasion-resistant materials. Special side links, newly designed connecting elements, rollers and a triple stop-dog system minimize wear and reduce drive energy. All the component parts can be replaced for easy maintenance. To monitor the service life, smart plastics sensors can be integrated into the pin and bore connection.