Progressive Engineers offers Robust Rotating Electrical Connectors. Progressive Engineers also offers Electrical Connectors, Solder Paste, Packaging Solutions., Packaging Test Equipments, Induction Seals/Wads., Validation of Packs. Robust Rotating Electrical Connectors offer an extremely low resistance electrical connection because the electrical conduction path is a liquid metal which is molecularly bonded to the contacts. The Robust Rotating Electrical Connectors have a fixed connection and the connection does not change. The Robust Rotating Electrical Connectors have a maximum RPM of 1800.