Extremely slim. The 221 generation terminal blocks are a real space saver: their volume has been reduced by 40 % compared to the previous model (222 series). This means that electrical installers can now also realise applications with tight installation conditions without any problems. Thanks to the extremely slim design of the new series, the wired terminals can be inserted quickly and easily into the installation boxes. Furthermore, the space savings offer additional options for later extensions. See what's what. The new transparent plastic housing design of the 221 series makes it easy to visually check the correct conductor position. After connection, the electrician can immediately see whether all the conductors have been plugged in as far as they will go and connected correctly. The correct stripping length of the conductors can now also be easily checked at a glance. Closed cable funnels ensure clear guidance of the conductors to the clamping point. Focus on user-friendliness. Two test openings allow the installer to test the terminal conveniently and safely even when installed, using all standard test probes. The recessed grips on the sides of the housing increase user-friendliness when opening the levers. The new generation of clamps is based on the proven tool-free Cage Clamp technology, in which the clamping points are opened and closed using an operating lever. The difference to the previous model is that the lever is now even easier to operate. This makes it even easier and quicker to connect the conductors. Wide range of applications. As a universal terminal block, the new 221 series is able to accommodate all common conductor types: Conductor cross-sections from 0.14 to 4 mm² (fine-stranded) or 0.2 to 4 mm² (solid and stranded) can be covered with just one terminal.