The tool-free insertion of rigid conductors and conductors with wire-end ferrules significantly reduced wiring times compared to other connection technologies. In addition, the disconnection of the conductors could be carried out particularly easily and quickly. By reducing to only three sizes in the cross-section range from 0.14 to 16 mm², product selection and stock-keeping became easier.
In some applications it makes sense to add a test point or a disconnect element to the feed through terminal for testing and safety purposes. With test disconnect terminals you measure electric circuits in the absence of voltage. While the disconnecting points clearance and creepage distance is not assessed in dimensional terms, the specified rated impulse voltage strength must be proven.