BASE TERMINAL BLOCK AND AUXILIARY TERMINAL BLOCK FOR SWITCHBOARDS AND TWO-TIER TERMINAL BLOCK ASSEMBLY COMPRISING BASE TERMINAL BLOCK AND AUXILIARY TERMINAL BLOCK
A switchboard base terminal block for connecting electrical wires comprising an insulating body having one top side and a bottom side opposite in a vertical direction, and at least two respective flanks opposite to each other in a longitudinal direction; wherein inside the body there is formed at least: a first pair of seats; a first space centred on a central vertical axis and bounded in the longitudinal direction by respective first partitions extending parallel to the vertical direction spaced from each other in the longitudinal direction by an amount such as to define a size of the space suitable for housing a jumper of the screw type; an undercut with base formed in the top side of the terminal block, presenting a first central opening for connecting externally the central space for insertion of the respective screw jumper, and means for coupling with corresponding means of an add-on terminal block for forming a two-tier terminal block in the vertical direction wherein said coupling means are adapted for
