Double potential terminal block, 280 Series, operating tool Our double potential terminal block (item number 280-989) ensures effortless electrical installations. Ensure that the strip lengths are between 8 and 9 mm when connecting conductors to this double potential terminal block. WAGO's double potential terminal blocks are a space-saving solution that boasts two current bars with different potentials on one level. ou can separately through-wire a single potential on each side of the terminal block. The compact design saves space without sacrificing functionality. Featuring conductor terminals along with CAGE CLAMP®, this product outperforms the competition. Our reliable and maintenance-free CAGE CLAMP® connection makes it easy to connect all types of conductors without having to prepare the conductor. For example, you don't need to crimp ferrules. This double potential 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.