Through terminal block, 280 Series, operating tool Connect conductors quickly and securely with this through terminal block (item number 280-906). Conductors can only be connected to this through terminal block if their strip length is between 8 and 9 mm . 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 proven universal connection known as CAGE CLAMP® leads the way when it comes to connection technology and electrical interconnections. This through terminal block is suitable 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.