Modular terminal block, in particular a multi-level terminal block, for clamping a plurality of jumper wires that can be led thereto in an orderly fashion using a comb-type structure. The comb-type structure can be put together from separate bars that have clip-on-portions and cooperate with mating clip-on portions on the terminal block such that the bars can be removed from the terminal block when no comb-type structure is needed.