Klippon® Connect WPD Terminal Blocks Weidmuller Klippon® Connect WPD Terminal Blocks allow for the easy and safe installation of aluminum and copper conductors on a small footprint. WPD series terminal blocks feature a compact and robust design, secure application, and quick installation. These blocks are safe to use in a multitude of surroundings due to a self-extinguishing plastic housing that contains no halogen and is touch safety pursuant to EN 50247. Quick installation is achievable because if two or more distribution blocks are being installed, they can be assembled horizontally or vertically.