Wurth WR-TBL 301 Series 5mm Horizontal Entry Modular Terminal Block Connectors with Pressure Clamp WR-TBL 301 series 5mm pitch PCB terminal block connectors with a horizontal wire entry and pressure clamp. These 301 B series 5mm PCB terminal blocks use a 'slot' type M2.6 screw terminal which accepts a wire size of AWG 22-14 and have a phosphor bronze wire guard. The body of these 5mm WR-TBL modular terminal blocks is made from blue UL94-V0 PA66.