Through terminal block, 280 Series, CAGE CLAMP® Our through terminal block (item number 280-650) is the perfect way to connect conductors quickly and securely. Ensure that the strip lengths are between 8 and 9 mm when connecting conductors to this through terminal block. Whether in industrial or building applications, our rail-mount through terminal blocks are the perfect solution to quickly and securely connect electrical conductors. Depending on the version, you can use them for either typical through-wiring or potential distribution. This product features conductor terminals and utilizes CAGE CLAMP®. Our reliable and maintenance-free CAGE CLAMP® connection makes it easy to connect all conductor types without having to prepare the conductor. For example, you don't need to crimp ferrules. Depending on the conductor type, this through terminal block is designed for conductor cross sections ranging from 0.08 mm² to 2.5 mm². This through rail-mount terminal block is operated with an operating tool.