Circular Locking Connectors & Cable Assemblies Amphenol Commercial MRD Circular Locking Connectors and Cable Assemblies are 2-, 3-, and 4-position IP67 connectors. These connectors and cable assemblies feature housing options including all-plastic constructions and metal-locking bodies for increased durability. Locking options include 1/3-turn bayonet as well as quick-release metal latches. Panel mount and cable termination options are available with or without finger-proof protection. Amphenol Commercial MRD Circular Locking Connectors and Cable Assemblies offer a current rating up to 10A and are designed to with a -55°C to +105°C temperature range.