Abstract: A terminal block for the electrical connection of conductor wires or cables has one or a plurality of adjacent and mutually connected box-like bodies (1) in the end walls of which are formed apertures for receiving the ends of wires to be connected.Within these box-like bodies there is a three dimensional structure (6) shaped in trapezoidal form, made of elastic, electrically conductive material, having its shorter side defined by a reaction plate (10) projecting beyond the two inclined sides of the trapezoidal form itself, and the dimension of which, in plan, reproduced that of a plate defining the longer side.Levers (16) having underlying teeth (17) may be provided to press the tongues (8) away from the reaction plate (10) to facilitate insertion of a wire, or a cover may be provided with holes to allow a tool to be introduced for this purpose.