The Lemo B series offers modular, ergonomic and rugged circular multipole connectors for applications needing quick and secure push-pull latching. It is well-suited for test and measurement and instrumentation. The modular insert configurations include a range of high-density multipole or hybrid electrical contacts. Contacts can be of solder type, crimp, PCB straight or PCB elbow, fiber, coaxial, thermocouple, pneumatic, fluidic or high voltage. The series ranges from 00 to 5B sizes. A keying system allows for a higher contact density while preventing mismating. These connectors are UL-listed, and cable assemblies can be provided.