Through terminal block, 285 Series, black Connecting conductors is quick and easy with this through terminal block (item number 285-639). Strip lengths must be 23 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 suitable for conductor cross sections ranging from 6 mm² to 35 mm². This through rail-mount terminal block is operated with an operating tool.