An electronic terminal block for a data bus has control electronics comprising first and second data-bus-contacting units connected via an internal data-bus line, and a connecting unit for connecting bus subscribers. The metal housing comprises a first face having a receptacle in a carrier rail, a second face having a recess for the connecting unit, a first side face, an opening for the first data-bus-contacting unit, and a second side face opposite the first side face with an opening for the second data-bus-contacting unit. A first non-metallic coupling plate for mounting onto the first housing side face comprises a first recess having an engagement feature in the region of the opening of the first side face, and a second non-metallic coupling plate for mounting onto the second side face comprises a first recess having an engagement feature in the region of the opening of the second side face.