Through terminal block, 284 Series, blue Our through terminal block (item number 284-904) ensures effortless electrical installations. Strip lengths must be between 12 and 13 mm when connecting conductors to this through terminal block. Whether for industrial or building applications, you can use our through terminal blocks to connect electrical conductors quickly and safely. We offer variants for both classic through-wiring and potential distribution. This product incorporates conductor terminals and utilizes CAGE CLAMP®. Our trusted universal connection known as CAGE CLAMP® is industry-leading when it comes to connection technology and electrical interconnections. Depending on the conductor type, this through terminal block is designed for conductor cross sections ranging from 0.2 mm² to 10 mm². This through rail-mount terminal block is operated with an operating tool.