Panel Feed-Through Terminal Blocks Phoenix Contact Panel Feed-Through Terminal Blocks offer a complete range of wiring 'through the panel'. The High Current PFT Series features terminal blocks with secure universal screw and ring lug/bolt connection technology. The PWL 16 Series offers spring termination on both sides of the panel. The Phoenix Contact PWO Series offers user-friendly push-in connections, tool-free wiring of conductors with ferrules or solid conductors, and molded versions that ensure maximum tightness of seals.