TER has acquired decades of experience in designing and manufacturing slip ring collectors, providing now three series of rotating collectors, used in particular in industrial and construction lifting plants for supplying motors of crane, cable winders and small jib cranes. These machines operate in difficult thermal conditions (low or high operating temperatures) with great thermal shifts between night and day, and they are subject to a variety of weather conditions (water, dust, UV rays and salt). They therefore need components protected against weather effects, resistat to extreme temperatures, with high mechanical and electrical durability and resistance, accuracy in control. All components must be precise, reliable and safe to ensure good handling control, guarantee maximum operating safety, prevent personal injury and damage to objects.