PTS Series Twin Feed Through Terminal Blocks A professional range of PTS series Twin Feed-through terminal blocks from Phoenix Contact. These push in connection terminal blocks are characterised by the system features of the CLIPLINE complete system and by easy tool-free wiring of conductors with ferrules or solid conductors. The PTS series terminal blocks are a compact design and front connection enabling a wide range of cable size wiring in confined space. All terminal blocks provide an addition test connection and are highly reliable and excellent quality.