BT CLIPLINE Complete Barrier Terminal Blocks Phoenix Contact BT Series CLIPLINE Complete Barrier Terminal Blocks combine a ring cable lug connection with the advantages of the CLIPLINE complete terminal block system. The uniform system accessories, such as the standardized plug-in bridges, provide considerable time savings during wiring. Using continuous marker strips, the terminal blocks can be marked across a large surface, and each terminal point can be marked clearly. The transparent design of the strips means you retain a clear overview when bridging.